JPH03160130A - Engine stall preventing method during start of vehicle - Google Patents

Abstract

PURPOSE:To enable a vehicle to smoothly start by controlling an intake air amount so as to be increased corresponding to a return amount of a clutch pedal at the time of starting the vehicle in which a clutch is stepped in with a manually operated transmission operated in a running position. CONSTITUTION:In an electronic control unit 10 when a vehicle is in operation, whether a clutch pedal 11 is stepped in or not is discriminated by a signal (d) from a clutch position sensor 8, when the clutch pedal is stepped in, next whether a manually operated transmission 1 is shifted to a running position or not is discriminated by a signal (e) from a neutral switch 9. When the discrimination is YES, whether the clutch 11 is in returning or not is discriminated by an output of the clutch position sensor 8, and in the case of judging the pedal 11 during returning, a flow control valve 4 in a bypass passage 3, provided so as to detour around a throttle valve 2, is controlled in accordance with a return amount of the clutch pedal 11. That is, the larger the clutch return amount is the larger the mount of intake air is.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Applications] The present invention relates to a method for preventing an engine stall at the time of starting a vehicle, which can be suitably applied to the engine of an automobile or the like equipped with a manual transmission.

[Prior Art] In general, an engine equipped with an injector is provided with a flow control valve for adjusting the amount of auxiliary air in a bypass passage that bypasses a throttle valve.

Further, in many engines equipped with a carburetor, an idle speed controller for adjusting the opening degree of the throttle valve is provided on the throttle shaft. Then, during idling, the flow rate control valve or idle speed controller is controlled to increase or decrease the amount of intake air, thereby feedback controlling the engine speed during idling to the target rotation speed.

Further, as prior art of the present invention, for example, JP-A-62-
As shown in Publication No. 643, when the engine speed falls below a predetermined speed, the feedback control is stopped and the flow rate control valve is controlled to open, thereby quickly bringing the engine speed to idling. Some are configured to increase the rotational speed up to the target rotational speed. Alternatively, some systems enrich the air-fuel ratio when the engine speed falls below a lower limit setting value to make it difficult for engine stall to occur.

[Problems to be Solved by the Invention] However, with such a configuration, when the clutch is engaged very slowly in an idling state, the load on the engine gradually increases and the engine speed gradually decreases. Therefore, the above-mentioned E control works to raise the engine speed to the original speed, but in the case of non-idling, the engine speed control valve etc. are controlled to the closed side, and the above-mentioned control is It disappears. Therefore, with this configuration, I
;If the vehicle is started while the vehicle is idling or the accelerator pedal is not fully engaged, it is difficult to prevent the engine from stalling; is more likely to occur.

The present invention aims to eliminate such problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following configuration.

That is, in the method for preventing engine stall when starting a vehicle according to the present invention, when the clutch pedal is depressed and the manual transmission is operated to the running position, the engine stall is stopped in response to the amount of return of the clutch pedal. It is characterized by increasing the amount of air.

Note that in a half-clutch region where the engine speed begins to decrease when the clutch pedal is released, the engine is rapidly loaded, so the amount of intake air may be rapidly increased in this region.

[Effects] When the manual transmission is operated to the drive position, the 11 volts applied from the drive system to the engine as the clutch pedal is released
load increases. At this time, since the amount of intake air increases in accordance with the amount of return of the clutch pedal, the amount of fuel supplied also increases accordingly. Therefore, even if the amount of depression of the accelerator pedal is uneven, the engine speed can be controlled according to the increase in engine fish load.
It becomes possible to start the vehicle smoothly.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

The engine schematically shown in FIG. 1 is for an automobile, and includes a manual transmission 1, a flow control valve vSv4 provided in a bypass passage 3 that bypasses a throttle valve 2, an injector 5, and a pressure sensor 6. , a crank angle sensor 7, a clutch position sensor 8, a neutral switch 9, and an electronic control device 10 that controls the operation of the flow rate control valve vSv4, injector 5, and the like. The flow rate control valve vS4 is for opening and closing the bypass passage 3 to adjust the amount of auxiliary air, and is equipped with an electromagnetic coil, whose duty is controlled by the electronic control device 10. The injector 5 has a built-in electromagnetic coil, and when a fuel injection signal a is applied from the electronic control device 10 to the electromagnetic coil, fuel is injected near the intake boat. The pressure sensor 6 is configured to be able to detect the intake pressure on the downstream side of the throttle valve 2, and the detected value is used for measuring the amount of intake air, etc. The crank angle sensor 7 is built into a distributor (not shown) and is configured to detect engine speed and the like. The clutch position sensor 8 is, for example,
It is similar to a throttle opening sensor, and converts the return amount (stroke) of the clutch pedal 11 into an electrical signal and outputs it. The neutral switch 9 is configured to detect whether the manual transmission 1 is operated to a traveling position (1st speed, 2nd speed, R, etc.). The electronic control unit 10 includes a central processing unit 12 and a memory 1.
3, a human interface 14, and an output interface 15. The input interface 14 includes at least an intake pressure signal b from the pressure sensor 6, an engine rotation signal C from the crank angle sensor 7, a signal d from the clutch position sensor 8, and a signal e from the neutral switch 9. are entered respectively. The output interface 15 outputs a duty control signal f to the flow control valve VSV 4 and a fuel injection signal a to the injector 5, respectively. This electronic control device 10 plays the role of adjusting the fuel injection amount in accordance with the intake air amount determined from the intake pressure signal b, engine rotation signal C, and the like.

Further, a program as schematically shown in FIG. 2 is set in the electronic control device 10. On the premise that the engine has been started, in step 51, it is determined whether or not the clutch pedal 11 is depressed (ON) based on the signal d from the clutch position sensor 8, and it is determined that the clutch pedal 11 is depressed. If so, proceed to step 52. In step 52, it is determined based on the signal e from the neutral switch 9 whether the manual transmission 1 has been shifted to the running position, and if it is determined that the manual transmission 1 has been shifted to the running position, the process proceeds to step 53. In the steering knob 53, the clutch pedal 1 is actuated by the signal d from the clutch position sensor 8.
It is determined whether or not 1 is being returned, and if it is determined that it is being returned, the process proceeds to step 54. In step 54,
As shown in FIG. 3, the flow rate control valve VS
Controls V4. That is, as the amount of return of the clutch pedal 11 increases, the flow rate control valve VS increases accordingly.
Increase the duty ratio of V4.

According to such a configuration, when the load on the engine increases as the clutch pedal 11 is returned when the vehicle is started, the amount of intake air is increased in response to the increase, so that the fuel supplied from the injector 5 is increased. The injection amount is also increased according to the intake air amount. As a result, even if a start operation is performed with insufficient depression of the accelerator pedal 11, the engine speed at the time of start can be increased to a sufficient value on behalf of the driver, and the car can be started smoothly. It can be launched. Moreover, with such a system, even if quick clutch engagement is performed before the engine speed has sufficiently increased by -L, the return speed of the clutch pedal 11, in other words, the speed of increase in engine load. Since the amount of intake air can be increased substantially in synchronization with the engine speed, control delays are less likely to occur, and engine stall at the time of start can be effectively prevented.

In the above embodiment, the intake air amount was adjusted by duty-controlling the flow rate control valve provided in the bypass passage of the throttle valve, but an idle speed controller for adjusting the throttle opening degree is also provided. Then, the intake air amount may be adjusted by controlling the idle speed controller.

Furthermore, in the embodiment described above, the amount of intake air is increased approximately in proportion to the return stroke of the clutch pedal, but the intake air starvation may be adjusted as follows. For example, if the clutch starts to engage when the clutch pedal is released, a load starts to be applied to the engine and the engine speed decreases. This is a so-called half-clutch state. Therefore, in this half-clutch region, if the amount of intake air is rapidly increased as shown by the shaded area in Fig. 4, the engine speed can be controlled in approximately proportion to the increase in engine load. , Furthermore, it becomes possible to perform a smooth start.

[Effects of the Invention] According to the present invention configured as described above, the engine speed can be appropriately controlled in response to an increase in the load applied to the engine when the vehicle is started, so that when the accelerator pedal is depressed, To provide a method for preventing an engine stall when starting a vehicle, which allows the vehicle to start smoothly even when a starting operation is performed with insufficient engine power.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a schematic diagram showing the overall structure, FIG. 2 is a flowchart diagram schematically showing the control procedure of the embodiment, and FIG. The figure is a diagram showing control setting conditions. FIG. 4 is a diagram corresponding to FIG. 3 showing another embodiment of the present invention. 1... Manual transmission 3... Bypass passage 4... Flow rate control valve 8... Clutch position sensor 9... Neutral switch 11... Clutch pedal

Claims (1)

[Claims] An engine for starting a vehicle, characterized in that when the clutch pedal is depressed and the manual transmission is operated to a running position, the amount of intake air is increased in response to the amount of return of the clutch pedal. How to prevent stall.