JPS60151131A - Slip preventing apparatus for car - Google Patents

Abstract

PURPOSE:To previously prevent the breakage, etc. of a catalytic converter and exhaust pipes by installing a catalyst-temperature detecting means for detecting the temperature of the catalyst in the catalytic converter installed into the exahust pipe of an engine, thus preventing the abnormal heating of the catalyst. CONSTITUTION:An exhaust-temperature sensor 3 is installed onto a catalytic converter connected to the exhaust pipe 5 of an engine 4 and outputs an analogue voltage signal at the level corresponding to the exhaust temperature. A fuel injection amount controller 14 for controlling the feeing amount of the fuel supplied into the engine 4 is connected to a control circuit 15, and when a fuel cut-off signal as the control signal supplied form the circuit 15 is input, fuel injection is suspended. The circuit 15 as slip control means is constituted of a microcomputer as main part. When the catalyst is in abnormally heated state, the fuel cutting-off signal outputted into the apparatus 14 from an output circuit 55 is reset, and fuel cutting-off is released, and the apparatus 14 restarts fuel injection.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a slip prevention device for a vehicle, and in particular to a slip prevention wave shield for a vehicle that can change the state of slip control according to the catalyst temperature in a catalytic converter. Regarding.

[Prior art] Conventionally, the driving wheel speed and the driven wheel speed of a vehicle are detected, and the slip state of the drive iFI+ wheel during acceleration is determined based on the difference in both wheel speeds, and when it is determined that the drive wheel is in a slip state. , by reducing or cutting off the fuel supply to the drive engine and suppressing the engine power transmitted to the drive wheels, or when the engine is ignited! A device has been proposed that prevents slippage of the drive wheels by controlling 11J to the rising angle side to reduce engine torque.

However, with the slip prevention device using the previous method, when slip &lυ11 occurs frequently, the fuel supply to the engine is cut off and the rapid reduction ffB is repeatedly performed, so there is a problem such as a shortage of fuel supply ff1l, etc. niJ:
There is a problem in that the combustion condition in the cylinder of the re-engine deteriorates and unburned gas is discharged, and this unburned gas causes an oxidation reaction in the catalytic converter and generates light heat. For this reason, the exhaust pipe X5 catalytic converter is abnormally heated and 1. There was a possibility that the exhaust purification performance would deteriorate, and in some cases, it could lead to damage. This also applies when the engine torque is controlled by ignition timing control.

Unburnt gas may be emitted due to poor combustion, which also poses a problem.

Purpose of the Invention] The present invention has been made to address the above-mentioned problems, and therefore prevents abnormal heat in the exhaust pipe and catalytic converter caused by deterioration of the combustion state of the engine during slip control. The purpose is to provide a dual-use anti-slip device that prevents performance deterioration and traction.

[Configuration of the Invention] As shown in FIG. 1, the configuration of the present invention made to achieve the above object includes a driving wheel speed detecting means M1 for detecting the driving wheel speed, and a slave wheel speed detecting means for detecting the driven wheel speed. A driving wheel speed detection means M2, an engine M3, an i-lux control stage M5 that controls the engine torque transmitted to the driving wheels M4, and a speed difference between the driving wheel speed and the driven wheel speed. When it is more than a predetermined value,
slip control means M6 for controlling the torque control means M5 to perform slip control; A catalyst temperature detection means M9 is provided for detecting temperature, and the slip control means M6 is configured to detect the catalyst temperature detection means M9.
The gist of the present invention is a slip prevention device N for a vehicle characterized in that it is configured to change the state of the slip control 11 according to the detected catalyst temperature.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, the present invention will be explained with reference to embodiments and drawings.

[Example] FIG. 2 is a schematic diagram of a dual-use anti-slip reversing body. In the figure, 1 is a driving wheel speed sensor which detects the rotational speed of the driving wheel 1a of the vehicle, and 2 is a driven wheel speed detection means which detects the rotational speed of the driven wheel 2a. Depending on the speed of the driven wheels, for example, an electromagnetic rotary sensor using a pickup ':1 wheel is used to output a frequency signal according to the rotational speed of the Φ wheel.

3 is installed in the catalytic converter 6 connected to the exhaust of the 4-cylinder 41 noise engine 4 to record the exhaust gas.
: +1t 'tI As a catalyst temperature detection means, for example, a thermistor-type low temperature sensor is used, and outputs an ablog voltage signal at a level corresponding to the exhaust temperature.
Zuru. Reference numeral 14 denotes a fuel injection control device, which supplies fuel to the engine 4 by supplying fuel to a fuel pressure pump J (not shown).
The amount of fuel supplied (fuel injection amount) to all is controlled.

The fuel injection loss control device 14 electromagnetically controls the amount valve time of the fuel injection valve 4b installed in the intake manifold 4a of the engine 4 according to the intake air amount to the engine 4, It is configured to keep the controls down. The fuel injection suspension control device 14 includes a control circuit 1 which will be described later.
5, and when a fuel cutoff signal is input through the control input Δ5 from the control circuit 15 to perform normal control of the fuel 131 injector m, the stop for fuel slanted injection is input. (2
&i 13+ cutoff).

This fuel injection OA amount control device 14 controls the engine 1~lux, that is, the 1~lux of the driving wheels of the vehicle by controlling the fuel injection hanger.
14 years old-C.

The control circuit 15, which is a slip control means, is composed of a microcomputer as a main part, and a CPU 5 that executes various performance control processes based on a predetermined program.
1.B [ROM 52, a memory dedicated to continuous reading that stores fixed information such as 1-gram data, RAM 53, a temporary storage memory that can read and read data, and an input circuit that inputs various signals and sends input data to the CPU 51. 54, Output circuit 55 for outputting fuel cutoff S to the fuel supply device 14
, and CPLI'51. ROM52. RAM 53° input circuit 54. A bus 57 is provided that connects the output circuits 55 to each other. The input circuit 54 receives signals sent from the exhaust temperature sensor 3 and a counter 54a1 that counts the rotational speed from signals sent from the driving wheel speed sensor 1 and the driven wheel speed sensor 2 (pulse signals with a frequency corresponding to the rotational speed). An A/D converter 54b for converting an analog voltage signal into a digital signal is provided. Note that 60 is a power supply circuit connected to the battery 61 via 1--switch 63 and supplies voltage to the control circuit 15.

Next, based on the flowchart in Figure 3, CF) U51
The operation of the anti-slip wave break will be explained while explaining the performance control processing carried out by L.

When the key switch 63 is turned to A and the vehicular slip prevention device is activated, control is started as shown in FIG. . Next step 1
At step 00, the driving wheel speed IJl[Vw detected by the driving wheel speed sensor 1 as J: continues after step 100 (step 1
At 01, the driven wheel speed Vv detected by the driven wheel speed sensor 2 is taken into the CPLJ 51 via the input circuit 54. Next, in step 102, the above step 1
The driven wheel speed VV taken in step 01 is multiplied by a constant 1 to calculate the judgment reference value Vt used for slip judgment. Then, the process proceeds to step 103, and the step 100
Slip determination is performed by determining whether the drive wheel speed UVw taken in step 102 is greater than the determination reference value Vt determined in step 102, and if the drive wheel speed Vw is not greater than the determination reference value V[, Assuming that there is no need to execute slip control, the process then proceeds to step 107 to reset the fuel cutoff signal. Therefore, in the processing routine passing through step 107, slip control by cutting off the fuel 1'31 is not performed, and the fuel injection amount control device tJ
1: J: A predetermined amount of fuel is supplied into the cylinder.

On the other hand, when the driving wheel speed VW is determined to be greater than the judgment reference value ■ (in the Stub 103, the slip control ti
Assuming that step 11 is to be carried out, the process proceeds to step 114, where the exhaust gas temperature sensor → catalyst detected by J"3:" exhaust gas temperature in inverter 6 - "C" is input via circuit 57I,
51. Then, step 115 is executed to determine whether or not the exhaust gas 41iTC taken in at step 114 is lower than a preset abnormal heating state of the catalyst. T
If c is lower than the abnormal heating determination temperature 'I-o, it is determined that the catalyst is normally depleted, and the process proceeds to step 116, where a fuel cut-off signal is outputted via the output circuit 515. This 4
When the IS fuel cutoff signal is output, the fuel control device 14 burns the fuel in the opposite direction, reduces the engine 1-lux, and suppresses the 1-lux of the drive wheel 1z1. Then, slip control is performed.

On the other hand, if the air-fuel mixture supplied to the cylinder is significantly diluted due to repeated fuel shutoffs for slip control, the air-fuel mixture will not burn in the cylinder, but will be heated to a certain extent before being exhausted. It is discharged via @5 to the catalytic converter 6, where it undergoes an oxidation reaction and generates heat. As a result, the inside of the catalyst converter 6 is heated, and the exhaust gas temperature T
C lends me 1. In this case, the determination in step 115 as to whether the exhaust gas temperature Tc is equal to or higher than the abnormal heating determination temperature 1-o becomes r'YE, sJ, and the process proceeds to step 107, assuming that the catalyst is in an abnormal heating state. Go on,
Fuel cutoff No. 18, which was output from the output circuit 55 to the fuel injection amount control device 14, is turned off.

By resetting the fuel cutoff signal I~, the fuel cutoff is canceled, and the fuel injector 11i1j III equipment 14 restarts the injection of a predetermined amount of fuel based on the normal fuel injection control.

As a result, even if the conditions for increasing the fuel level tj for slip control are met, if the catalyst starvation is judged to be abnormally high, the fuel will not be cut off, so no combustion will occur in the cylinder. Inside the catalytic converter 6 (-J,
Abnormal heating of the medium in the catalytic converter 6 is prevented. go.

When the processing in step 1116 or step 107 ends, control returns to step 100 again.
1-Processing run 1-Repeat the process t-+L, repeat the process 4 green for more than 100 subs.

As explained below-1-, in this embodiment, the speed difference between the driving wheel 'la and the driven wheel 2a is within a predetermined value (+Ti or more).
11.1 of L. In this case, the supply of fuel 1 to the engine 4 is cut off...J, in other words, the engine torque transmitted to the drive wheels is suppressed and the C slip control is performed, but the slip control is Even if the i-J condition is true, the slip 1111 and 211 due to fuel peeking should not be performed when the II temperature inside the catalytic converter 0 is higher than the predetermined 111. 4111 have been completed. For this reason, slip control is performed frequently and fuel is repeatedly supplied and cut off, causing the air-fuel mixture supplied to the cylinders of the engine 4 to become diluted, leaving insufficient combustion inside the cylinders.
1 is released, an oxidation reaction occurs inside the catalytic converter 6, which generates heat and heats the catalyst, and if the exhaustion becomes abnormally high, the slip control is prohibited and the fuel λ1 is of;
Control is performed to ensure that the 111 is not disconnected. Therefore, when slip control is repeated frequently, the exhaust pipe 5 and the catalyst will not be heated and damaged, and deterioration of the exhaust gas purification performance of the catalyst will be prevented (and its durability will also deteriorate). can.

In this embodiment, the slip control is prohibited when the exhaust gas temperature (as the catalyst i temperature) is equal to or higher than a predetermined value. , the slip control is prohibited by -11.
Other systems such as changing the history between 1 and 1 and changing the slip judgment level! 311 can also be carried out without changing the gist and purpose of the present invention.

In addition, in the above embodiment, by cutting off the fuel and re-engineering, in other words, the torque of the driving wheels 1a was reduced by 1 to perform slip prevention control, but the dilution of the air-fuel ratio,
Is it possible to inhibit the ignition and control the d angle of +1JJ during the ignition - but suppress the torque of the drive wheels and control the slip? If this is not possible, set the slip control nt+ to t74<100, detect the presence of the catalyst, and change the state of the C slip control 911 (for example, prohibit slip control ≧11). is′J,
It is clear that the present invention is not applicable.

[Effects of the Invention] As explained below, if the vehicle slip 1:Jj JI device of Mizumoto 111J is used, the slip prevention control will be performed as follows: Insufficient fuel supply to the engine) Due to deterioration of combustion, unburned gas is discharged and it comes in contact with C111I'+, and Fj! l: If oxidation and LEi occur inside the catalyst converter, and the catalyst has an abnormal temperature of 1-111 "hzuIU/," (by changing the slip 1111 control state,) Unburned gas, etc. may be emitted.41J,・UniJ
Therefore, it is possible to prevent the catalyst from heating. ,
It is possible to prevent deterioration of the catalyst due to continued abnormal heating, such as damage to the converter, 17+ ICU damage to the trachea, or Uj gas purification of the catalyst.

[Brief explanation of drawings]

The first factor is a basic block diagram of the present invention, FIG. 2 is a schematic diagram of a slip control rjll device according to an embodiment of the present invention, and FIG. 3 is a diagram showing the control of the embodiment. )1”-もA・-
It is 1-. 1... Drive wheel speed sensor 2... Driven wheel speed sensor 3... Exhaust temperature sensor V 4... Engine 41)... Fuel injection valve 5... Exhaust pipe 6... Catalytic converter 14...Fuel injection side control device 15...Control rj11 circuit 51...cpu Agent Patent attorney Tsutomu Sadate (1 person)

Claims (1)

[Claims] 1 Drive wheel speed detection means for detecting the drive wheel speed; driven wheel speed detection means for detecting the driven wheel speed;
ll-! slip control for performing slip control by controlling the silk control means and the silk control means, and the speed difference between the driving wheel speed and the driven wheel speed being 1 or more; A small dual-purpose slip prevention device comprising: (1) a catalyst temperature detection means for detecting the temperature of a catalyst in a catalytic converter installed in the trachea of the engine; However, by the catalyst temperature detection means (
A slip prevention device for a vehicle, characterized in that the state of a slip control 911 is changed or reversed depending on a detected catalyst temperature. 2. The slip prevention device for a vehicle according to claim 1, wherein the change in the slip control state by the slip control means is to prohibit slip control when the catalyst temperature exceeds a predetermined value. 3. Claim 1 or 2, wherein the engine torque is controlled by shutting off the fuel 1'31.
Anti-slip device for vehicles as described in .