JP6241646B2 - In-vehicle battery information display device - Google Patents

Description

  The present invention relates to an in-vehicle battery information display device, and is particularly suitable as a battery information display device that displays information on an in-vehicle battery that requires maintenance.

  A conventional battery information display device is disclosed in Patent Document 1, for example. This display device includes a battery detection means, a voltage change calculation means, and a battery deterioration determination means. The measured voltage value is compared with a predetermined value, and an alarm is generated according to the comparison result. It warned the battery deterioration.

  Further, the capacity detection and deterioration detection of a vehicle battery in a battery information display device are performed by calculating the capacity based on the discharge IV characteristics and using changes in the power supply voltage and current at the time of engine start. A method of detecting the capacity or a method of detecting the power supply voltage when the starter is used and determining that the power supply voltage is equal to or higher than the upper limit reference value and not to be lower than the lower limit reference value is used. Note that this type of capacity deterioration detection method is disclosed in, for example, Patent Document 2.

JP-T-2006-509670 JP 59-180469 A

  These prior arts require a new means for detecting unstable starter current when starting the engine, and it has been difficult to make reliable settings under a wide range of usage conditions. In any case, it is necessary to newly set a means for detection in the conventional battery deterioration detection method, which is not easy to implement.

  Further, the parameter to be detected is a power supply voltage or a current value, and since this parameter is small, reliability is applied. This is because the capacity of the battery changes depending on the electric load of the battery and the ambient temperature, and is not unified.

  Accordingly, an object of the present invention is to provide an in-vehicle battery information display device capable of notifying a maintenance worker so that necessary information relating to in-vehicle battery deterioration can be sufficiently confirmed by paying attention to the above-described problems.

The vehicle-mounted battery information display device of the present invention is operated by power supply from the vehicle-mounted battery, and controls the vehicle starting operation and power supply information , and wiring from the vehicle-mounted battery via the vehicle start switch. A voltage detection unit that is connected and detects a voltage value of a power supply voltage and outputs the detected voltage value to the control unit; a storage unit that stores the power supply information by the control unit; and vehicle information that is displayed by the control unit Display means, and the control means, after the initialization process for controlling the output of the display means, the voltage value input from the voltage detection means is more than a predetermined voltage drop threshold The start value determination process for determining the start operation of the vehicle and the voltage value input from the voltage detection means after the start is By fall within a constant of variation performs start completion determination process for determining the starting operation completion, within a predetermined time period up to and including the starting operation completion of the vehicle from starting operation start of the vehicle, a voltage value of the power supply voltage A plurality of power supply information is stored in the storage means at regular intervals, a plurality of types of calculation are performed on the amount of change or elapsed time of the voltage value stored in the storage means, and these are displayed on the display means as battery information. It is characterized by.

  Further, the control means stores in the storage means together with additional information for specifying the detection date and time of the power information, and causes the display means to display the battery information together with the date and time information based on the additional information. .

  The present invention relates to an in-vehicle battery information display device, and can notify a maintenance worker so that necessary information regarding in-vehicle battery deterioration can be sufficiently confirmed.

The figure which shows the structure in embodiment of this invention. The figure shown about the voltage fluctuation example at the time of starting of embodiment same as the above.

  Hereinafter, as an embodiment of the present invention, an example applied to a vehicle instrument will be described with reference to the drawings.

  The vehicle meter M notifies a vehicle user of measurement values (vehicle state) detected by various sensors using a vehicle-mounted battery as a driving power source, and includes, for example, a vehicle speed meter, a fuel fuel gauge, and the like. . Further, in this case, the vehicle meter M is provided with a function for notifying maintenance information such as a replacement time of each part such as engine oil and a filter of the vehicle on a display means such as a liquid crystal display panel and a clock for notifying the time.

  As shown in FIG. 1, the vehicle meter M includes a voltage detection unit 1, a control unit 2, a storage unit 3, and a display unit 4, and is mounted on the vehicle via an activation switch (ignition switch) S. Connected to battery V. The in-vehicle battery V is connected to a load such as a starter device F in addition to the vehicle meter M, and can supply a drive power having a normal voltage of about 12V.

  The voltage detection means 1 is connected to the wiring from the in-vehicle battery V, can apply an AD converter for detecting the voltage value of the power supply voltage, and outputs the detected voltage value to the control means 2. The voltage detection means 1 may be built in the control means 2.

  For example, a microcomputer can be applied to the control means 2, and input speed information from the voltage detection means 1 or a traveling speed from an ECU separately mounted on the vehicle via a CAN (Controller Area Network) communication cable (not shown). And various information such as the fuel injection amount can be input.

  The control means 2 includes a CPU for performing arithmetic processing based on the input information and various information, a readable / rewritable RAM for temporarily storing arithmetic processing results in the CPU, a control program and control data. And a storage unit composed of a ROM storing the above and an input / output interface connected by bus for exchanging the various information, control signals, clock signals, and the like. In this case, the control means 2 is provided with a drive driver for driving the display means 4.

  As the storage unit 3, a nonvolatile memory provided in addition to the storage unit (RAM or ROM) can be applied. For example, an EEPROM or a flash memory can be used. The storage means 3 is connected by the control means 2 so that information can be stored in and read from the storage means 3.

  The display means 4 displays on the basis of a control signal from the control means 2 in a composite instrument device provided on the instrument panel of the vehicle. For example, a liquid crystal display panel provided with a backlight can be applied.

  Next, the processing procedure of the control means 2 at the time of starting the vehicle will be described.

  When the start switch S shifts from a disconnected state to a connected state (when a start operation is performed), the control unit 2 receives power supply from the in-vehicle battery V and performs an initial operation. In this case, the control means 2 performs an initialization process for controlling the input from the voltage detection means 1 and the output of the display means 4.

  After the initialization process, the control unit 2 stores the voltage value from the voltage detection unit 1 in the RAM at regular intervals. In this case, as shown in FIG. 2, the voltage value is monitored at intervals of 10 milliseconds (voltage value monitoring process).

  Furthermore, when the power supply voltage temporarily decreases due to the starter device F being actuated by the start operation of the vehicle by the operator, the control means 2 causes the voltage value input from the voltage detection means 1 to drop by a predetermined voltage. The start of the vehicle is determined (start start determination process) when it falls below the threshold (for example, 9V) V1 for a predetermined time (100 milliseconds) T1 or more, and the voltage from one second before the start of the start is determined. The value information and the voltage value information for 4 seconds from the start of starting are held as power supply information. The starter device F includes a cell motor for operating cranking, and is a device for starting the engine based on the operator's operation.

  The control means 2 determines whether or not the fluctuation of the voltage value falls within a predetermined time (for example, 500 msec) T2 and a predetermined fluctuation (for example, ± 0.5 V) within 4 seconds from the start of the start. By determining (starting completion determining process), it is estimated that the vehicle has been started. When it is determined that the start operation of the vehicle has not been completed, the control unit 2 stops holding the voltage value information (power supply information) for 5 seconds and performs the voltage value monitoring process again. Note that the start completion determination process may be determined or detected from the engine speed or vehicle information via CAN.

  In addition, when the control unit 2 determines that the start is normally completed by the above-described start completion determination process, the control unit 2 performs an information storage process for storing the held voltage value information for 5 seconds in the storage unit 3. Do. At this time, the date / time information is stored in association with the voltage value information. Further, the control unit 2 performs a plurality of types of calculations on the amount of change in voltage value or the elapsed time, and performs display processing for displaying these calculation results on the display unit 4 as battery information.

  In this case, the control means 2 determines, as items that can be calculated and displayed based on the voltage value information at regular time intervals, “minimum voltage value during start” V3, “time for recovering to a predetermined voltage V4 during start-up. "T4", "Time from start to completion" T5, "Voltage value before start" V6, "Voltage value after start" V7, "Voltage value at predetermined time T8 after start" V8, "First after start "Voltage fluctuation peak value" V9, "Time to first voltage fluctuation peak after start" T9, "Voltage difference before start and after start" V10, "Voltage fluctuation peak from start to start complete" “Number of occurrences” N11, “Voltage value of last voltage peak during start-up” V12, “Time from last peak of voltage change during start-up to completion of engine start” T12, “Last peak of voltage change from start-up Time until "T13 To, can be displayed on the display unit 4 as the battery information for determining the deterioration state of the battery V and voltage fluctuations, or the measurement time.

  The control means 2 switches the screen of the display means 4 on the basis of an input from an operation switch (not shown) mounted on the vehicle meter M, and from other display items (for example, integrated travel distance, outside air temperature, etc.). The battery information can be selected and displayed. At this time, the battery information can be displayed together with the date / time information recorded by monitoring the start, for example, it can be determined how many days ago the measurement information is. Note that the date information stored in the storage unit 3 may be a date or time by a calendar function, or may store a counter value for measuring how much time has elapsed since the start.

  Moreover, the control means 2 can also perform the determination process which determines the deterioration state of the vehicle-mounted battery V based on several battery information. If it is determined by this determination processing that the vehicle is in a deteriorated state, a warning light provided on the vehicle meter M is turned on or the battery information is interrupted and displayed on the display means 4 so that the vehicle user can An opportunity to confirm the necessity of maintenance can be provided.

  Such a vehicle-mounted battery information display device is operated by power supply from the vehicle-mounted battery V, and controls the vehicle starting operation and the power supply information. The storage device 3 stores the power supply information by the control device 2. And display means 4 for displaying vehicle information by the control means 2, and the control means 2 keeps the voltage value of the power source constant within a predetermined time period from the start of the start of the vehicle to the start of the vehicle. A plurality of power supply information is stored in the storage means 3 for each period, and a plurality of types of calculation regarding the amount of change or the elapsed time of the voltage value are calculated, and these are controlled to be displayed on the display means 4 as battery information.

  Therefore, the battery information regarding the voltage fluctuation at the time of start-up can be displayed in various ways, and the vehicle-mounted battery information display device can notify the maintenance worker so that necessary information for determining deterioration of the vehicle-mounted battery can be sufficiently confirmed.

  Further, the control means 2 stores in the storage means 3 together with additional information for specifying the detection date and time of the power information, and displays the battery information on the display means 4 together with the date and time information based on the additional information. Can determine the presence or absence of maintenance and the maintenance method while also being aware of the detection environment. For example, it becomes a judgment material for maintaining the vehicle-mounted battery V, such as whether it was detected when the temperature is high or whether it was detected before a long period of time.

  In addition, although the vehicle-mounted battery information display device of the present invention has been described as an example in the configuration of the above-described embodiment, the present invention is not limited to this, and the gist of the present invention is also in other configurations. It goes without saying that various improvements and display changes can be made without departing from the scope of the invention. As the battery information, the voltage value and the elapsed time are displayed as described above. However, the present invention is not limited to this, and the voltage value information stored in the storage unit 3 can be displayed as it is, or as shown in FIG. In addition, a graph showing a voltage change within a predetermined time including the start time can be displayed.

  The present invention can be applied to an in-vehicle battery information display device, for example, an in-vehicle battery information display device mounted on a moving body including an automobile, a motorcycle, an agricultural machine, or a construction machine.

DESCRIPTION OF SYMBOLS 1 Voltage detection means 2 Control means 3 Storage means 4 Display means M Vehicle instrument S Start switch V Car-mounted battery F Starter apparatus (load)

Claims (2)

A control means that operates by power supply from an in-vehicle battery, monitors a vehicle start operation, and power information ;
Voltage detection means connected to the wiring from the in-vehicle battery via the start switch of the vehicle, detecting a voltage value of a power supply voltage, and outputting the detected voltage value to the control means;
Storage means for storing the power supply information by the control means;
Display means for displaying vehicle information by the control means;
With
The control means includes
After an initialization process for controlling the output of the display means,
A start start determination process for determining a start operation start of the vehicle when a voltage value input from the voltage detection unit falls below a predetermined voltage drop threshold for a predetermined time or more;
After the start is started, a voltage value input from the voltage detection means is within a predetermined fluctuation, thereby performing a start completion determination process for determining start operation completion,
A plurality of voltage values of the power supply voltage are stored in the storage means as the power supply information at regular intervals within a predetermined time period from the start of the vehicle start operation to the completion of the vehicle start operation ,
A vehicle-mounted battery information display device that performs a plurality of types of calculations on the amount of change or elapsed time of the voltage value stored in the storage means, and displays these as battery information on the display means. The said control means is stored in the said memory | storage means with the additional information which specifies the detection date of the said power supply information, The said battery information is displayed on the said display means with the date information based on the said additional information, It is characterized by the above-mentioned. The vehicle-mounted battery information display device according to 1.

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