JPS61275539A - Throttle valve control device for car - Google Patents

Abstract

PURPOSE:To enable an optimum valve opening control even in an abnormal condition by controlling a throttle valve on the basis of an accelerator tread- down amount detecting signal in stead of a throttle valve opening detecting signal when the abnormality of throttle valve actuator and throttle valve opening detecting means and the like is discriminated. CONSTITUTION:An arithmetic means (d) which computes the target throttle valve opening on the basis of the accelerator tread-down amount detected by a tread-down amount detecting means (c) or a preset control mode or the like and also carries out the feedback control of the throttle valve opening to this target valve opening on the basis of the result detected by a throttle valve opening detecting means (b) is provided. The throttle valve is driven to be opened or closed by an actuator (e) in accordance with the output of this arithmetic means (d). Further, a discriminating means (f) which discriminates the abnormality of the actuator (e) and the valve opening detecting means (b) and the like is provided, and it is so constituted that the actuator (e) is controlled by a control means (g) on the basis of the output signals of the tread-down amount detecting means (c) and an operating condition detecting means (a) when an abnormality is discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for automatically controlling the opening and closing of a throttle valve of an internal combustion engine mounted on a vehicle.

(Prior art) As a conventional device for automatically controlling the opening and closing of a throttle valve,
For example, the device described in Japanese Patent Laid-Open No. 132428/1983 is known, and this device is shown as shown in FIG.

In FIG. 11, 1 is a carburetor, 2 is a throttle valve,
3 is a throttle valve opening/closing lever, 4 is a valve shaft, 5 is a throttle valve return lever, and 6 is a spring that biases the throttle valve 2 in the closing direction via the throttle valve return lever 5. The throttle valve 2 is opened and closed by an accelerator pedal (not shown) and also by an actuator 7. That is, the actuator 7 includes a stroke shaft 8, a reduction gear 9, a motor 10, and an idle detection switch 11. When the motor 10 rotates, the reduction gear 9 rotates and the stroke shaft 8 moves in the axial direction. This movement of the stroke shaft 8 causes the throttle valve opening/closing lever 3 to swing, thereby opening and closing the throttle valve 2. On the other hand, when the driver steps over the accelerator pedal, the throttle valve opening/closing lever 3 separates from the stroke shaft 8, and the stroke shaft 8 is pushed out by a spring 12 provided in the idle detection switch 11.

Therefore, the stroke shaft 8 and the reduction gear 9 are pushed together with the contact piece 13 of the idle detection switch 11 as shown by the broken line in the figure, and the idle detection switch 11 is turned off.
becomes. Detection of depression of the accelerator pedal can be performed regardless of the position of the stroke shaft 8.

The motor 1O is driven by a control unit 14 signal, and the control unit 14 calculates the opening degree of the throttle valve 2 based on the operating state of the vehicle and outputs a signal to the motor 10. At this time, the control unit 14 determines whether the idling state has transitioned to the starting state based on the signal from the idle detection switch 11.
It also determines whether there has been a transition from constant speed driving to accelerated driving, etc.
Performs control for starting or accelerating.

(Problems to be Solved by the Invention) However, in such a conventional vehicle throttle valve control device, if the actuator detects an abnormality in the handle detection switch (means for detecting the throttle valve opening), etc., for example, the motor Since the throttle valve opening is controlled based on the signal from the detection means even in the event of deterioration of the sensor or disconnection of the wiring of the detection means, an abnormality may occur in the actuator, idle detection switch, etc. In some cases, the opening degree of the throttle valve cannot be controlled to be appropriate for the driving condition of the vehicle, resulting in a problem that driving performance deteriorates.

(Objective of the Invention) Therefore, the present invention provides a means for determining an abnormality in the actuator that opens and closes the throttle valve and the detection means for detecting the valve opening of the throttle valve, and when an abnormality occurs, the detection means does not detect the valve opening based on the signal of the valve opening detection means. , by controlling the opening degree of the throttle valve based on the amount of depression of the accelerator pedal or the degree of depression of the accelerator pedal, the gear position, and the driving state of the vehicle.
Even in the event of an abnormality, the throttle valve opening is controlled to be optimal for the operating conditions, improving operating performance and safety.

(Structure of the Invention) The vehicle throttle valve control device of the present invention, as shown in the basic conceptual diagram in FIG. 1 or 2, has the following features:
Driving state detecting means a detecting the driving state of the vehicle; valve opening detecting means detecting the valve opening of the throttle valve; and accelerator detecting means C detecting the amount of depression of the accelerator pedal.
Calculation means that calculates a target valve opening of the throttle valve based on the amount of depression of the accelerator pedal, a preset control mode, etc., and performs feedback control on the target valve opening based on the detection result of the valve opening detection means. d, an actuator e that opens and closes the throttle valve based on an input signal, a determining means r that determines whether there is an abnormality in the actuator or the valve opening detection means, and when the determining means determines that there is an abnormality,
Another invention includes a control means g for controlling the valve opening degree of the throttle valve based on the amount of depression of the accelerator pedal and the driving state of the vehicle, and a driving state detecting means a for detecting the driving state of the vehicle; The valve opening detection means detects the opening degree of the throttle valve, the accelerator detection means C detects the amount of depression of the accelerator pedal, and the throttle valve opening detection means C detects the amount of depression of the accelerator pedal, and the throttle valve opening detection means C detects the amount of depression of the accelerator pedal. a calculation means d that calculates a target valve opening and performs feedback control on the target valve opening based on the detection result of the valve opening detection means; an actuator e that drives the throttle valve to open and close based on an input signal; A determining means f for determining an abnormality in the actuator, a valve opening detecting means, etc.; a gear position detecting means g for detecting the gear position of the transmission; and when the determining means determines an abnormality, the amount of depression of the accelerator pedal and the transmission The throttle valve opening is controlled based on the gear position of the throttle valve, and the throttle valve opening is controlled to the optimum throttle valve opening for the operating conditions, improving safety even in the event of an abnormality. This improves driving performance.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIGS. 3 to 8 are diagrams showing one embodiment of the present invention.

First, the configuration will be explained.

In FIG. 3, 21 is a rotation speed sensor that detects the rotation speed N of the engine, and the rotation speed sensor 21 is, for example, a crank angle sensor, and outputs a pulse signal corresponding to the rotation speed N of the crankshaft. . A vehicle speed sensor 22 detects the vehicle speed V of the vehicle, and the vehicle speed sensor 22 detects, for example, rotation of a speedometer cable and outputs a pulse signal corresponding to the vehicle speed V. 23 is an accelerator detection means for detecting the depression amount θa of the accelerator pedal, and the accelerator detection means 23 outputs a voltage signal proportional to the depression stroke θa of the accelerator pedal. Reference numeral 24 denotes a valve opening degree detection means for detecting the valve opening degree θt of the throttle valve 25, and the valve opening degree detection means 24 outputs a voltage signal proportional to the valve opening degree θt of the throttle valve 25.

Various signals from the rotational speed sensor 21, vehicle speed sensor 22, accelerator detection means 23, valve opening detection means 24, water temperature sensor, intake temperature sensor, etc. (not shown) are input to the control unit 26, and each of these sensors is connected to the vehicle. It constitutes an operating state detection means 27 for detecting the operating state of the vehicle.

The control unit 26 includes a CPU 28 and a RAM 29.
, ROM 30, I10 port 31, A/D converter 32.
33 and a drive circuit 34, these include a data bus,
The address bus and control bus are worn out.

The CPU 28 reads necessary external data from the I10 baud) 31 and A/D converters 32 and 33 according to the program written in the ROM 30, and also reads the data from the RAM.
29, performs arithmetic processing, and outputs a control signal to the drive circuit 34.

The RAM 29 is composed of, for example, a nonvolatile memory, and temporarily stores data input from the I10 boat 31 and the A/D converter 32, 33, and data being processed, and retains the stored contents even after the engine is stopped. do. ROM3
0 stores a program for controlling the CPU 28, and also stores data used for calculations in the form of a map or the like.

The I10 boat 31 receives signals from the rotation sensor 21 and the vehicle speed sensor 22, and the A/D converters 32 and 33 receive signals from the accelerator detection means 23 and the valve opening detection means 24, respectively. It has been entered. The drive circuit 34 outputs a drive signal Sa to the actuator 35 based on the control signal, and operates the actuator 35 to open and close the throttle valve 25. This control unit 26 has functions as a calculation means, a determination means, and a control means, which will be described later.

Next, the effect will be explained.

When the actuator 35 and the valve opening detection means 24 are normal, the control unit 26 uses its calculation means to control the throttle based on the accelerator pedal depression amount θa, the driving state of the vehicle, a predetermined control mode, etc. The target valve opening degree of the valve 25 is calculated, and the valve opening degree θt of the throttle valve 25 is set to the target valve opening degree based on the valve opening degree θt of the throttle valve 25 detected by the valve opening degree detection means 24. Feedback control.

On the other hand, when the valve opening detecting means 24 or the like is abnormal, feedback control actually deteriorates engine performance, which not only deteriorates driving performance but also impairs safety.

Therefore, in this embodiment, the abnormality of the actuator 35 and the valve opening detection means 24 is detected based on the valve opening θt detected by the valve opening detection means 24 and the accelerator pedal depression amount θa detected by the accelerator detection means 23. When an abnormality occurs, feedback control based on the valve opening degree is stopped and control is performed based only on the vehicle operating state.

Hereinafter, the 118 process at the time of abnormality will be explained based on the flowchart shown in FIG. In addition, PI' in Figure 4
=PII indicates each step of the flow.

First, in step P and step P2, the valve opening θt of the throttle valve 25 and the depression amount θa of the accelerator pedal are read, and in step P, it is determined whether the actuator 35 and the valve opening detection means 24 are normal or abnormal. This abnormality can be determined from the correlation between the valve attitude θt and the depression amount θa. That is, under normal conditions, the valve attitude θt and the depression amount θa fall within the shaded area in FIG. 5, but when an abnormality occurs, the valve opening degree θt changes as shown in FIG.
and the amount of depression θa may show large variations, or the valve opening degree θa may vary greatly.
t will continue to display zero. In addition, in Figure 5,
The reason why there is a width in the diagonal line is due to variations in the accelerator detection means 23 and the valve opening detection means 24 themselves.

Therefore, in step P, depending on whether the correlation between the depression amount θa and the valve attitude θL is within a predetermined allowable variation,
It is possible to determine whether the valve opening degree detection means 24 and the like are normal or abnormal, and step P functions as a determination means. If it is normal, the routine proceeds to the main routine for performing feedback control during normal operation, and if it is abnormal, the engine speed N and vehicle speed V are read in steps P4 and P5. In step P6, the engine speed N is compared with a predetermined maximum speed Nm. This maximum rotation speed Nm
is pre-stored in the ROM 30 in the form of a map using the amount of depression of the accelerator pedal θa as a parameter, for example, as a value as shown in FIG. 7, and safety can be ensured for the amount of depression of the accelerator pedal θa. It is set as the number of rotations.

When N≧Nm in step P6, the output of the drive signal Sa to the actuator 35 is stopped at a position not exceeding the maximum rotation speed Nm in step P, and the process returns to step P. N<N
m, the vehicle speed ■ is set to the predetermined maximum vehicle speed V in step P.
Compare with m. This maximum vehicle speed Vm is stored in advance in the form of a map in the ROM 30 as a value, for example, as shown in FIG. 8, using the accelerator pedal depression amount θa as a parameter. The vehicle speed is set at a speed that ensures safety.

When V≧Vm in step P8, step P is executed.

Then, the output of the drive signal Sa to the actuator 35 is stopped at a position where the maximum vehicle speed is not exceeded, and the process returns to step P4. V
<Vm, step P. Then, the valve opening degree θtb is determined based on the driving condition of the vehicle and the amount of depression of the accelerator pedal θa.
is calculated, and a drive signal Sa corresponding to the valve opening degree θtb is outputted to the actuator 35 at the step pH, and the steps P,
Return to In addition, in step PIG and step pH, the output of the drive signal Sa is controlled so that the engine speed N or vehicle speed V becomes the engine speed N or vehicle speed ■ set in advance with respect to the depression amount θa of the accelerator pedal. Good too. Steps P4 to Ps described above serve as a control means for controlling the opening degree of the throttle valve based on the operating state of the vehicle in the event of an abnormality.

Therefore, the actuator 35 and the valve opening detection means 24
Even if an abnormality occurs, the throttle valve can be controlled to the valve opening appropriate for the vehicle operating condition in accordance with the amount of depression of the accelerator pedal, improving driving performance and reducing engine rotation. Maximum value NmSv for number N and vehicle speed V
m is provided, the safety of the vehicle can be ensured.

FIGS. 9 to 11 are diagrams showing other embodiments of the present invention.

This embodiment is a modification of the previous embodiment in which the gear position is taken into account as one of the operating conditions, and in explaining this embodiment, the same components as those in the above embodiment will be given the same reference numerals and their explanation will be omitted.

In FIG. 9, reference numeral 41 denotes a gear position detecting means for detecting the gear position (lower, neutral, 1st, 2nd, etc.) of the transmission, and the gear position detecting means 41 is, for example, a shift position of a shift lever. Use the limit switch installed on the

As shown in the tenth flowchart, the microcomputer 26 determines whether the actuator 35 and the valve opening detection means 24 are normal or not, and when they are abnormal, the actuator 35 is activated based only on the signal from the operating state detection means 27.
is driven to control the opening degree of the throttle valve 25. To explain only the differences from the process shown in FIG. 4, when it is determined that there is an abnormality in step P, the engine rotation speed N, vehicle speed ■, and gear position are read in steps P4 to P2°, and step pt+ So, the engine speed N
is compared with a predetermined maximum rotation speed Nmz. This maximum rotational speed Nmz is set to RO as a value as shown in FIG. 11 for each gear position according to the depression amount θa of the accelerator pedal.
It is stored in advance in the form of a map in the M30, and is set as a rotation speed that can ensure safety with respect to the depression amount θa of the accelerator pedal at the relevant gear position. In addition, Nm in FIG.

is the maximum rotation speed in l speed and reverse position,
Hereinafter, Nmt % Nn, , Nmn are respectively 2nd speed,
It shows the maximum rotation speed in 3rd and 4th gears.

When N<Nm in step P□, further step
The vehicle speed V is compared with a predetermined maximum vehicle speed Vm, which is the same as the process shown in FIG.

Therefore, in this embodiment, the maximum rotational speed Nm of the engine can be set in accordance with the amount of depression of the accelerator pedal and the gear position. The opening degree can be controlled, driving performance can be improved, and safety can be further improved.

In each of the above embodiments, the engine speed is checked first and then the vehicle speed is checked to control the valve opening, but conversely, the vehicle speed is checked first and then the engine speed is checked. You may check it.

In addition, the parameters that display the driving status of the vehicle include:
It goes without saying that the present invention is not limited to those shown in each of the above embodiments.

(Effects of the Invention) According to the present invention, when an abnormality occurs in the actuator, valve opening detection means, etc., the throttle valve is opened in accordance with the amount of depression of the accelerator pedal or the amount of depression of the accelerator pedal and the gear position. Since the vehicle can be controlled at the same time, the driving performance of the vehicle can be improved.

In each of the above embodiments, maximum values are set for the engine speed and vehicle speed, so it is possible to prevent sudden changes in the engine speed and vehicle speed, thereby ensuring vehicle safety. I can do it.

[Brief explanation of drawings]

1 and 2 are basic conceptual diagrams of the present invention. Third
8 to 8 are diagrams showing one embodiment of the present invention, FIG. 3 is a schematic configuration diagram thereof, FIG. 4 is a flowchart showing its operation, and FIG. 5 is a normal state of the valve opening detection means, etc. Figure 6 shows the relationship between the accelerator pedal depression amount and the throttle valve opening degree when the valve opening detection means is abnormal. FIG. 7 is a map of the maximum rotation speed given by the amount of depression of the accelerator pedal as a parameter, and FIG. 8 is a map of the maximum vehicle speed given by the amount of depression of the accelerator pedal as a parameter. 9 to 11 are diagrams showing other embodiments of the present invention, FIG. 9 is a schematic configuration diagram thereof, FIG. 10 is a flowchart showing its operation, and FIG. 11 is the amount of depression of the accelerator pedal. This is a map of the maximum rotation speed given for each gear position with . FIG. 12 is a schematic configuration diagram showing a conventional vehicle throttle valve control device. 23------Accelerator detection means, 24・------
--1. Valve opening detection means, 25. ---1 --- Throttle valve, 26. --- Control unit (calculating means, determination means, control means), 27. --・Operation state detection means.

Claims (2)

[Claims] (1) a) Driving state detecting means for detecting the driving state of the vehicle; b) Valve opening detecting means for detecting the valve opening of the throttle valve; c) Accelerator detecting means for detecting the amount of depression of the accelerator pedal. d) Calculate the target valve opening of the throttle valve based on the amount of depression of the accelerator pedal, a preset control mode, etc., and perform feedback control on the target valve opening based on the detection result of the valve opening detection means. e) an actuator that opens and closes the throttle valve based on the input signal; f) a determining means that determines whether there is an abnormality in the actuator or valve opening detection means; g) when the determining means determines that there is an abnormality. A throttle valve control device for a vehicle, comprising: a control means for controlling the opening degree of the throttle valve based on the amount of depression of the accelerator pedal and the driving state of the vehicle. (2) a) driving state detection means for detecting the driving state of the vehicle; b) valve opening detection means for detecting the valve opening of the throttle valve; and c) accelerator detection means for detecting the amount of depression of the accelerator pedal. d) Calculate the target valve opening of the throttle valve based on the amount of depression of the accelerator pedal, a preset control mode, etc., and perform feedback control on the target valve opening based on the detection result of the valve opening detection means. e) an actuator that opens and closes the throttle valve based on the input signal; f) a determining means that determines abnormalities in the actuator, valve opening detection means, etc.; and g) detecting the gear position of the transmission. gear position detection means; h) control means for controlling the valve opening of the throttle valve based on the amount of depression of the accelerator pedal, the gear position of the transmission, and the driving state of the vehicle when the determination means determines that there is an abnormality; A vehicle throttle valve control device comprising: