JP4545103B2 - Engine starter composed of single cylinder cylinder - Google Patents

Description

The present invention relates to a startup equipment to start the engine, which is composed of a single cylinder type cylinder.

In order to operate independently, it is necessary to ignite fuel such as gas and gasoline after being driven from the outside to a certain number of revolutions. For this reason, operation is performed after being driven by a cell motor or the like.
Further, since the engine generator is provided with a generator for generating power, the cell motor can be eliminated by driving the generator as a motor.

When driving a permanent magnet generator as a motor, it is necessary to handle it as a synchronous motor. In this case, it is necessary to provide a sensor for detecting the rotor position or to drive by sensorless control. .
However, the provision of a sensor has the problem that the device becomes larger and the cost increases.In addition, when driven by sensorless control, it is difficult to obtain a torque fluctuation suppression effect by the flywheel at low speeds. In addition to increasing the influence, it is difficult to detect the exact position of the rotor, and the torque that the motor can output tends to be smaller than the rated value, and it is difficult to start up if there is no margin in the output of the motor There's a problem.

  In addition, there is a known device (decompression mechanism) that opens the exhaust valve until the engine reaches the speed at which the engine is ignited, so that compression does not occur. If the number increases, the exhaust from the exhaust valve will not be in time, and compression torque will be required, and fluctuations in the load torque will increase, making it difficult to start up if there is no margin in the output of the motor .

In view of this, there has conventionally been known an invention in which an engine with a relatively small torque is used to stably start the engine by overcoming the load of the compression stroke of the engine.
For example, in Japanese Patent Laid-Open No. 7-71350 (Patent Document 1), a crank angle of an engine is read to check a current position, that is, a start start position, and a preliminary rotation consisting of a predetermined rotation angle corresponding to this position or a reverse rotation of a predetermined time. A starter that commands normal forward rotation after instructing rotation, or reading the crank angle of the engine, confirms the start start position, discriminates the load torque decreasing direction from this position, and commanded preliminary rotation in the torque decreasing direction A starting device for instructing normal forward rotation is shown later.

Japanese Patent Application Laid-Open No. 2004-28007 (Patent Document 2) first detects that the motor is in the compression stroke because the motor is driven in the forward rotation and the rotation speed is lowered, and then drives in the reverse rotation. Similarly, the compression stroke is detected from the speed drop. Driving from this position to normal rotation again accelerates at a stroke until the compression stroke is reached.
As a result, it is shown that the approaching distance until the compression stroke is reached can be increased, so that the engine can be accelerated up to the cranking rotation speed over the high load region of the compression stroke at a stretch.

Japanese Patent Laid-Open No. 2004-28009 (Patent Document 3) determines that there is no engine rotation position in the high load region near the compression top dead center when it is detected that the motor rotation speed does not decrease. If the engine speed is accelerated to the cranking speed by rotating the engine forward and it is detected that the motor rotation speed has decreased, it is determined that the load is high, and the engine is reversely rotated to increase the engine load. It is shown that when the motor is rotated to the forward direction and then rotated forward, the engine is accelerated to the cranking rotational speed by overcoming the high load region of the compression stroke at once.

JP-A-7-71350 JP 2004-28007 A JP 2004-28009 A

However, in the example shown in Patent Document 1, since the start start position is confirmed, the predetermined rotation angle or the reverse rotation corresponding to the predetermined rotation angle or the predetermined rotation angle is preliminarily rotated in the direction of decreasing the load torque. Since it is necessary to accurately detect the starting start position, it is necessary to provide a crank angle detecting means, and this is not preferable as a general-purpose engine starting device with complicated devices.
Furthermore, in the examples shown in Patent Documents 2 and 3, the high load range near the compression top dead center is determined from the decrease in the rotational speed of the motor without using the crank angle detection sensor. This causes a problem that it takes too much time to start up, and the reverse rotation causes air to flow into the combustion chamber of the engine from the exhaust side and remove foreign matter. There is also a risk of inhalation.

The present invention has been made in view of such background, in the simplified structure, the activation equipment of configured engines from engine starting performance improved and the startup time single cylinder type cylinder which can be shortened The issue is to provide.

To solve the above problems, starting of an engine constructed from a single cylinder type cylinder according to claim 1, an electric motor for starting the engine, which is composed of a single cylinder type cylinder, the ignition signal to detect the ignition signal of the engine A detection means; a rotation speed detection means for detecting the rotation speed of the engine; and an electric motor control means for controlling the electric motor based on the ignition signal and the rotation speed. The motor control means receives an activation command. After that, the electric motor is driven at a low rotational speed 1 lower than the target cranking rotational speed, and after the ignition signal is detected, the motor further advances by an angle corresponding to the compression stroke, and then reaches the target cranking rotational speed. accelerated and configured to start the engine, further the electric motor control means, said ignition signal within a predetermined time after the acceleration by startup If not, the engine is driven again at a low rotational speed 2 that is lower than the low rotational speed, and after the ignition signal is detected and further advanced by an angle corresponding to the compression stroke, the predetermined torque is applied. The engine is accelerated to the ranking rotational speed and restarted .

According to the first aspect of the present invention, the air in the combustion chamber leaks out from the seal portion or the like of the exhaust valve during the compression stroke by driving at a low rotational speed 1 lower than the target cranking rotational speed. increase in the load at the compression stroke can be suppressed to overcome minimizing the compression stroke the load fluctuation.
Then, the absolute position of the crank angle of the engine is detected from the ignition signal of the engine composed of a single cylinder cylinder , and the engine is advanced at the low rotational speed by an angle corresponding to the compression stroke with reference to the signal position. Thus, acceleration can be started from a fixed position that has overcome the compression stroke without being subjected to load fluctuations.

Although load and rotational speed increases increases, smaller load because of low speed begins to still accelerating, sufficiently accelerated running period until the next compression stroke, overcame next compression stroke by flywheel effect due to inertia, The engine can be started reliably. And even if it uses the electric motor which cannot obtain a drive torque large, it becomes possible to start reliably, and size reduction of an apparatus can be achieved.

Since it possible to detect a predetermined position avoiding the compression stroke by using an ignition signal is output to the ignition means is constituted by a single cylinder type cylinder which can be activated reliably the engine with a simple structure the engine starting device may be provided.

Further, according to the present invention, if the ignition signal is not input within a predetermined time after acceleration even after the initial activation, it is determined that the initial activation has failed, and the initial low rotation speed 1 is further increased. Drive at a low rotational speed 2 by lowering the rotational speed, overcoming the compression stroke without further increasing the load during the compression stroke , and proceeding to a predetermined position further advanced from the ignition signal detection position. In the same way as the start of the engine, the engine is accelerated from the predetermined position to the target cranking rotational speed, and the engine can be restarted. Therefore, even if the initial startup fails due to some reason such as low temperature and increased engine load torque, it is possible to ensure engine startability by enabling restart.

According to a second aspect of the present invention, there is provided an engine starting device comprising the single-cylinder cylinder according to the first aspect , wherein the engine is provided with a decompression mechanism for opening an exhaust valve, and the motor control means If the ignition signal is not inputted within a predetermined time after acceleration even after the start, the engine is restarted by operating the decompression mechanism to drive the low rotational speed 1.

According to the second aspect of the present invention, the engine is provided with a decompression mechanism that opens the exhaust valve, and when the ignition signal is not input within a predetermined time after acceleration even after the first activation. judges that the initial startup fails, in that case, the by actuating the decompression mechanism, overcame without compression stroke undergo further load increase in the compression stroke, the detected position of the ignition signal The engine can be further advanced to a predetermined position, and the engine can be restarted by accelerating from the predetermined position to the target cranking rotational speed in the same manner as the first start. Therefore, even if the initial startup fails due to some reason such as low temperature and increased engine load torque, it is possible to ensure engine startability by enabling restart.

According to a third aspect of the present invention, there is provided an engine starting device comprising the single-cylinder cylinder according to the first or second aspect , wherein the electric motor control means inputs the ignition signal upon the restarting. Without waiting, the engine is accelerated from the position advanced by an angle corresponding to the compression stroke to the predetermined cranking rotation speed and restarted.

According to the invention of claim 3 , when the ignition signal is not input within a predetermined time after acceleration even by the first activation, it is determined that the first activation has failed, and the activation has failed. If it is determined that the load torque of the compression stroke is large, it is determined that the vehicle has stopped before that, and the engine is accelerated from the position advanced by an angle corresponding to the compression stroke to the target cranking rotation speed. By restarting, it is possible to start quickly for one revolution until the ignition signal is detected, and it is possible to shorten the startup time.

According to a fourth aspect of the present invention, there is provided an engine starting device comprising the single cylinder cylinder according to the first aspect , wherein a permanent magnet type synchronous electric machine is used for the electric motor.
According to the fourth aspect of the present invention, even in a control where it is difficult to generate torque as in synchronous operation, or in a control where it is difficult to generate torque such as in synchronous operation when a permanent magnet generator is used as an electric motor, it is ensured. The engine can be started.

According to the present invention, after the engine start command is input, the motor is driven at a low rotational speed 1 lower than the target cranking rotational speed so that no compression load is generated in the compression stroke of the engine, and then the engine is ignited. When the signal is detected, it is preferable to advance from the position by an angle corresponding to the compression stroke and then accelerate to the target cranking rotational speed and start the engine .

Thus, by driving at lower than the target cranking rotational speed of the low rotational speed 1, increase in the load at the compression stroke for the air in the combustion chamber in the compression stroke leaks from the seal portion or the like of the exhaust valve It can be suppressed and can overcome the compression stroke without load fluctuation.
The absolute position of the crank angle of the engine is detected based on the ignition signal of the engine, and by proceeding at the low rotational speed by the angle corresponding to the compression stroke with reference to the signal position, the load fluctuation is not received. Acceleration can be started from a fixed position after overcoming the compression stroke .

Although load and rotational speed increases increases, smaller load because of low speed begins to still accelerating, sufficiently accelerated running period until the next compression stroke, overcame next compression stroke by flywheel effect due to inertia, The engine can be started reliably. And even if it uses the electric motor with which a driving torque cannot be acquired largely, it can be made to start reliably.

According to the onset bright, it is possible to provide a structure easy to, the engine is composed of the engine starting performance improved and the startup time single cylinder type cylinder which can be shortened activation device.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely explanations. It is just an example.

In the drawings to be referred to, FIG. 1 is a block diagram showing functions of a main part of an engine starting device composed of a single cylinder cylinder according to a first embodiment of the present invention. FIG. 2 is a characteristic diagram showing the relationship between the rotor position of the electric motor and the load torque. FIG. 3 is a time chart showing an overall operation at the time of start-up of the engine starter according to the first embodiment, and FIG. 4 is a flowchart showing the control at the time of start-up according to the first embodiment. . FIG. 5 is a time chart showing the overall operation at the time of startup of the engine startup device according to the second embodiment, and FIG. 6 is a flowchart showing the control at startup according to the second embodiment. . FIG. 7 is a time chart showing the overall operation at the time of start-up of the engine starter according to the third embodiment, and FIG. 8 is a flowchart showing the control at the time of start-up according to the third embodiment. . FIG. 9 is a time chart showing the overall operation at the time of startup of the engine starting device according to the fourth embodiment, and FIG. 10 is a flowchart showing the control at the time of startup according to the fourth embodiment. .

(First embodiment)
FIG. 1 shows an engine power generator including a four-cycle internal combustion engine (engine) 2 and a permanent magnet generator 4. The engine 2 is composed of a single-cylinder cylinder using gasoline, gas or the like as fuel, fuel supply means (not shown) for supplying fuel such as gasoline or gas to the combustion chamber, ignition means 6 for igniting fuel at a predetermined timing, And a valve operating mechanism 8 for controlling opening and closing of the intake and exhaust valves.
Furthermore, the valve mechanism 8 is provided with a decompression mechanism 10 that keeps the exhaust valve open and discharges compressed air in the compression stroke from the exhaust valve.

  The generator 4 is a generator motor that also has a function as an electric motor, and is also an electric motor 12 for starting the engine 2 in the present invention, and a generator rotor 28 is attached to the tip of the crankshaft 14 in a directly connected state. It has been. A flywheel 16 is provided at the tip of the crankshaft 14, and a cooling fan 18 for cooling the generator motor is formed on the disk portion of the flywheel 16.

  The generator 4 is composed of a permanent magnet type three-phase synchronous type, and the rotor 28 includes a permanent magnet. A star-connected three-phase armature coil is wound around the stay core (not shown). Has been.

The motor control means 20 switches between the function of the generator motor as the generator 4 and the function of the motor 12, and has a three-phase inverter circuit 22 connected to each output terminal of the three-phase armature coil. The rotational speed of the electric motor 12 can be controlled by controlling the operating frequency of the inverter circuit 22. Since the rotation speed can be calculated from the operating frequency, the motor control means 20 is provided with an engine rotation speed detection means 23 at startup.
In addition, since the said matter is known, detailed description is abbreviate | omitted.

The ignition signal detecting means 24 for detecting the ignition timing signal is constituted by a sensor portion 26 attached to the main body of the engine 2 and a convex portion 30 provided on the outer periphery of the rotor 28 of the electric motor 12. The ignition signal is detected by approaching the sensor unit 26. The detected ignition signal is output to the ignition means 6 and also input to the motor control means 20. Further, the acceleration start position advanced by an angle corresponding to the compression stroke from the ignition signal is obtained by calculating the acceleration start position from the output phase of the three-phase inverter circuit 22 in the electric motor control means 20. Alternatively, similar to the ignition signal detection unit 24, the acceleration start position detection unit 34 is configured such that the projection 30 provided on the outer periphery of the rotor 28 of the electric motor 12 is detected by approaching the sensor unit 32. Also good. If the acceleration start position is not calculated, and the acceleration start position is calculated from the output phase of the three-phase inverter circuit 22 in the motor controller 20, the acceleration start position detector 34 is not required. Can be simplified.
Instead of the ignition signal detection means 24 attached to the position of the generator, the ignition signal detection means uses a sensor attached to the crankshaft or camshaft to detect the position of the crankshaft or camshaft as the ignition signal detection means 35 Also good. When attached to the camshaft, a signal is output once every two rotations in the case of a four-cycle internal combustion engine.
An activation switch 36 for issuing an engine activation command is also provided.

Next, the operation in the first embodiment will be described.
FIG. 2 shows an example of the relationship between the position of the rotor 28 of the electric motor 12 and the load torque of the electric motor 12, and in the case of a four-cycle engine, there is a compression stroke every two rotations. Indicates that the top dead center position of the compression stroke is 0 (deg), and the compression / expansion increases every 720 (deg). In the compression stroke , as shown in the figure, the load torque becomes large, and then the reaction becomes negative on the negative side. It changes to show characteristics that increase to the plus side. Normally, the ignition signal is generated before the top dead center position, and the ignition signal is generated every 360 (deg). For this reason, the ignition signal has a case before the compression top dead center and a case before the exhaust top dead center, and both are used in the processing as a similar ignition signal without determining which is the case.

2 indicates an ignition signal before the compression top dead center, and a triangle indicates an ignition signal before the exhaust top dead center. The acceleration start position 1 indicates a position advanced by an angle corresponding to an angle exceeding the compression stroke after obtaining the ignition signal ▲ before the exhaust top dead center, and the acceleration start position 2 is an ignition before the compression top dead center. A position advanced by an angle corresponding to an angle exceeding the compression stroke after obtaining the signal Δ mark is shown.

The constant angle α corresponding to the angle exceeding the compression stroke is that the ignition signal is at a position of about 70 (deg) before the top dead center, and from 100 (deg) to 150 (deg) after the top dead center. Since the influence of the compression load in the compression stroke remains, it is preferable that about 70 (deg) before top dead center to about 110 (deg) after top dead center is appropriate, and the constant angle corresponding to the angle exceeding the compression stroke is A position advanced by about 180 (deg) after the ignition signal is obtained is appropriate.
Incidentally, the ignition signal is generated for each revolution 360 (deg), since the load torque variation in the exhaust step does not vary as the load torque in the compression stroke, taking into account the load variation in the compression stroke determined that the predetermined angle It is done.

When acceleration is started from the acceleration start position 1, the acceleration is sufficiently accelerated until the load becomes large, and the next compression stroke can be overcome by the flywheel effect due to inertia. In addition, when accelerating from the acceleration start position 2, the distance to the next compression stroke can be longer than the acceleration start position 1, so the vehicle accelerates sufficiently until the load increases and overcomes the next compression stroke by the flywheel effect due to inertia. Can do.
When the ignition signal detecting means 35 attached to the camshaft is used, the ignition signal is only the Δ mark ignition signal, the acceleration start position is only the acceleration start position 2, and the acceleration is more reliable.

According to the time chart shown in FIG. 3, the start command signal is input at timing t <b> 1, and the start control by the motor control means 20 is started. First, starting is performed at a low rotational speed 1 that is lower than the target cranking rotational speed and at a slow low rotational speed 1 at which the torque fluctuation of the compression / expansion torque is suppressed by the engine as much as possible. When a signal is detected, it is determined that the vehicle has rotated beyond the compression stroke , and there is a signal indicating a position advanced by a certain angle α that can exceed the compression stroke from timing t2 when the ignition signal is detected. At the timing t3, acceleration is started to the target cranking rotation speed and the engine is started.

  If the ignition signal is not detected from the ignition signal detection means 24 even after the predetermined time T1 (time of at least one rotation) has elapsed since the start of the rotation with the low rotation drive 1, the initial activation fails. Therefore, the low rotation drive 2 is performed at the low rotation speed 2 lower than the low rotation speed 1 by ΔN rotation speed. This rotational speed is controlled by controlling the operating frequency of the three-phase inverter circuit 22 of the motor control means 20, and the frequency at the time of the low rotational drive 1 is stored, and from there, the frequency is lowered by ΔN rotational speed. The low rotational speed 2 is controlled.

Then, at timing t4, restart by the low rotation drive 2 is started, and if the ignition signal is detected by the ignition signal detection means 24, it is determined that the engine is rotating beyond the compression stroke , and the timing at which the ignition signal is detected. From t5, at a timing t6 when there is a signal indicating a position advanced by a certain angle α enough to exceed the compression stroke , acceleration is started to the target cranking rotational speed and the engine is started.
When the cranking target rotational speed is reached at the timing t7, the cranking speed is maintained, and at the timing t8, the engine 2 is detonated for the first time, and the engine speed starts to increase.

Next, the control flow at the time of starting in the electric motor control means 20 is demonstrated along the flowchart of FIG.
In step S100, it is determined whether or not there is a start command from the engine start switch 36. If the start switch 36 is input, the process proceeds to step S102, where the engine is slowed down so that the torque fluctuation of the compression / expansion torque is suppressed as much as possible. Low rotation drive 1 is performed at a low rotation speed 1.

In step S104, it is determined whether or not an ignition signal has been input. If the ignition signal has been input, the process proceeds to step S106, and driving is performed by a fixed angle α sufficient to exceed the compression stroke . In step S108, the fixed angle α is increased. Accelerate from the advanced position toward the cranking target rotation speed. In step S110, it is determined whether or not the cranking target rotational speed has been reached. If it has not reached, further acceleration is continued. If it has reached, the target rotational speed is maintained in step S112. In step S114, it is determined whether the engine speed has increased due to the first engine explosion. If it has increased, it is determined that the engine has started. In step S116, the operation of the three-phase inverter circuit 22 is stopped. End control.

  On the other hand, if it is determined in step S104 that no ignition signal is input, it is determined in step S118 whether or not a predetermined time T1 (a time corresponding to at least one rotation) has elapsed. If it is determined that the predetermined time T1 has elapsed, it is determined that the initial activation has failed, and in step S120, the low rotational speed 2 is lower than the low rotational speed 1 and the rotational speed is low. Perform 2 and start again. In step S122, it is determined whether or not an ignition signal has been input. If the ignition signal has been input, the process proceeds to step S106, and the process proceeds to the same as described in steps S108 to S116. If it is determined in step S122 that the ignition signal has not been input, it is determined in step S124 whether or not a predetermined time T2 (a time corresponding to at least one rotation) has elapsed, and the predetermined time T2 has elapsed. If yes, an abnormality is displayed in step S126, and the control is terminated.

Above, such as, according to this embodiment, by operating at low rotational drive 1 by the low rotational speed 1 a slow torque fluctuation is minimized compression and expansion torque in the engine, the combustion chamber in the compression stroke Since air leaks out from the seal portion of the exhaust valve and the like, an increase in load during the compression stroke can be suppressed, and the load fluctuation can be suppressed as much as possible to overcome the compression stroke .

By rotating at a low rotational speed 1, an ignition signal can be obtained over the compression stroke, and the absolute position of the crank angle of the engine 2 can be detected. Then, by advancing at an angle α min low speed 1 further of said corresponding to the compression stroke based on the position, further over the compression stroke without being load fluctuation, the acceleration start position after overcoming The acceleration can be started from the acceleration start position as a reference. Although load and rotational speed increases increases, smaller load because of low speed begins to still accelerating, sufficiently accelerated running period until the next compression stroke, overcame next compression stroke by flywheel effect due to inertia, The engine can be started reliably.

  Further, according to the present embodiment, even if the initial startup fails due to some reason such as low temperature and increased engine load torque, the low rotational speed 2 is lower than the low rotational speed 1 by ΔN rotational speed. The engine startability can be ensured by performing the low rotation drive 2 again and starting the restart.

Further, according to the present embodiment, even if a permanent magnet type synchronous motor that is difficult to control to obtain a large driving torque is used, the flywheel effect is obtained because the acceleration is already sufficiently accelerated in the compression stroke that requires a large driving torque. It is obtained and can be started reliably.

  Furthermore, according to the present embodiment, the present invention supplies the ignition means in advance as compared with the conventional technique in which the start control is performed after the crank angle of the engine is read and the start start position is confirmed. By using the ignition signal and calculating the rotational speed and rotational phase angle from the output of the three-phase inverter circuit 22, an engine starting device that can reliably start the engine with a simple configuration can be provided. Can be reduced in size.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. As shown in FIG. 5, the second embodiment has a feature that the number of revolutions at the time of restart is the same as that in the low-rotation drive 1, but the decompression mechanism 10 is further operated.

That is, as shown in FIG. 6, in step S118, it is determined whether or not the state where the ignition signal is not detected has passed a predetermined time T1 (a time corresponding to at least one rotation), and it is determined that the predetermined time has passed. If so, it is determined that the initial activation has failed, and the decompression mechanism 10 is further operated in step S121 while maintaining the low rotational speed 1 of the low rotational drive 1. Then, the operation after step S122 is the same as the operation described in the first embodiment.
The decompression mechanism 10 may be used from the beginning.

  According to the present embodiment, even if the initial startup fails due to some reason such as a low temperature and an increased engine load torque, the decompression mechanism 10 is further operated to restart the engine. Startability can be ensured.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. As shown in FIG. 7, in the first embodiment, the acceleration proceeds to the acceleration start position depending on whether or not there is an ignition signal within a predetermined time T2 after the restart. Without waiting for the timing t5 when the ignition signal is detected after the restart as shown in the first embodiment, the low rotational speed drive 2 is performed at the low rotational speed 2 which is lower than the low rotational speed 1 by ΔN rotational speed from the restart start timing t4. , And acceleration is started from the timing 6 advanced by a fixed angle α enough to exceed the compression stroke .
That is, failure to initial startup, because the load torque of the compression stroke is large, that it is determined to be down at the front, advancing only by a fixed angle α content of exceeded the compression stroke from its rest position It has the characteristics.

As shown in FIG. 8, in step S118, it is determined whether or not the state where the ignition signal is not detected has passed a predetermined time T1 (a time corresponding to at least one rotation), and it is determined that the predetermined time has passed. In this case, it is determined that the first activation has failed, and in step S120, the low rotation speed 2 is performed at the low rotation speed 2 lower than the low rotation speed 1 by ΔN rotation speed, and the activation is started again. Then, in step S106, driving is performed by a fixed angle α that can exceed the compression stroke , and in step S108, acceleration is performed toward the target rotation speed of cranking.

  According to the present embodiment, it is possible to quickly start up for one revolution until the ignition signal is detected.

(Fourth embodiment)
The same modification as that of the third embodiment can also be performed in the second embodiment.
That is, as shown in FIG. 9, the acceleration proceeds from the timing t4 at which the rotation is started by a certain angle α that can exceed the compression stroke by the operation of the low speed driving 1 and the decompression mechanism 10, and the acceleration is started from the timing t6.

As shown in FIG. 10, in step S118, it is determined whether or not the state where the ignition signal is not detected has passed a predetermined time T1 (a time corresponding to at least one rotation), and it is determined that the predetermined time has passed. If this is the case, it is determined that the initial activation has failed, and in step S121, the activation is started again under the operating conditions of the low rotation drive 1 and the decompression mechanism 10. Then, in step S106, driving is performed by a fixed angle α that can exceed the compression stroke , and in step S108, acceleration is performed toward the target rotation speed of cranking.

  According to the present embodiment, it is possible to quickly start up for one revolution until the ignition signal is detected.

According to the starting device of the engine, which is composed of a single cylinder type cylinder of the present invention, to simplify the structure, it is possible to provide a start equipment of the engine that can shorten the improvement and activation time of the engine start resistance, This is useful when applied to the engine starter.

It is a block diagram which shows the principal part function of the starting apparatus of the engine which concerns on the 1st Embodiment of this invention. It is a characteristic view which shows the relationship between the rotor position of an electric motor, and load torque. It is a time chart which shows the whole operation | movement at the time of starting of the starting apparatus of the engine which concerns on 1st Embodiment. It is a flowchart which shows the control at the time of starting which concerns on 1st Embodiment. It is a time chart which shows the whole operation | movement at the time of starting of the starting apparatus of the engine which concerns on 2nd Embodiment. It is a flowchart which shows the control at the time of starting which concerns on 2nd Embodiment. It is a time chart which shows the whole operation | movement at the time of starting of the starting apparatus of the engine which concerns on 3rd Embodiment. It is a flowchart which shows the control at the time of starting which concerns on 3rd Embodiment. It is a time chart which shows the whole operation | movement at the time of starting of the starting apparatus of the engine which concerns on 4th Embodiment. It is a flowchart which shows the control at the time of starting which concerns on 4th Embodiment.

2 Engine 6 Ignition means 8 Valve mechanism 10 Decompression mechanism 12 Motor 20 Motor control means 22 Three-phase inverter circuit 23 Rotational speed detection means 24 Ignition signal detection means

Claims (4)

An electric motor for starting an engine composed of a single cylinder cylinder, ignition signal detecting means for detecting an ignition signal of the engine, rotational speed detecting means for detecting the rotational speed of the engine, and based on the ignition signal and the rotational speed Electric motor control means for controlling the electric motor,
Said motor control means, the activation command to the electric motor from the input drive at cranking speed and low rotational speed 1 lower than the speed of the target, proceeds angle component corresponding to the further compression stroke from the detection of the said ignition signal accelerating to cranking rotational speed of the target and configured to start the engine from in further said motor control means, when said ignition signal within a predetermined time after the acceleration by launch is not input Is driven again at a low rotational speed 2 that is lower than the low rotational speed, and after the ignition signal is detected, further advances by an angle corresponding to the compression stroke, and then reaches the predetermined cranking rotational speed. An engine starter composed of a single-cylinder cylinder , characterized by accelerating and restarting the engine. The engine is provided with a decompression mechanism that opens the exhaust valve, and the motor control means has a low rotational speed 1 when the ignition signal is not input within a predetermined time after acceleration even by the start-up. 2. The engine starting device comprising a single-cylinder cylinder according to claim 1, wherein the engine is restarted by operating the decompression mechanism for driving. The motor control means restarts the engine by accelerating from a position advanced by an angle corresponding to the compression stroke to the predetermined cranking rotational speed without waiting for the input of the ignition signal at the time of restarting. An engine starting device comprising a single cylinder cylinder according to claim 1 or 2 . The starter for an engine composed of a single cylinder cylinder according to claim 1, wherein a permanent magnet type synchronous generator is used for the electric motor.

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