JPS6035141A - Control method for throttle valve - Google Patents

Abstract

PURPOSE:To smooth the speed of opening and closing a throttle valve in a car with torque converter, by changing said speed on the basis of the running condition of the car, when the valve opening is to be controlled in linkage with the amount of stamping-in on the accelerator pedal. CONSTITUTION:Signals about the amount of stamping-in on the accelerator pedal 1 and the position of a shift selector lever 8 of a transmission 5 are entered in a throttle speed map 91, which constitutes a control part 90 for the throttle valve. The map 91 emits a signal, showing the optimum throttle opening/closing speed according to various parameters given, to a pulse motor 2 for adjustment of the throttle valve. At this time a counter 93 shows the revolving position of said pulse motor 2, and figures to show the number of pulses from the map 91 are accumulated. A comparator 92 judges the direction in which the throttle valve is controlled, and compares the value on said counter 93 with the target value of the degree of opening of throttle valve to be determined distinctly from the angle of stamping-in on the accelerator pedal.

Description

DETAILED DESCRIPTION OF THE INVENTION a1 Technical Field of the Invention The present invention relates to an automatic transmission for a vehicle, and more particularly to a method of controlling a throttle lever of an automatic transmission using electronic control.

b. Technology background For people who drive vehicles (especially cars).

Especially for beginners, the clutch pedal and accelerator pedal.

It is difficult to operate the change lever etc. Furthermore, even if you are an experienced rider, driving over long distances or in crowded areas can make these single movements a nuisance and can easily cause you to get tired. For this purpose, an automatic transmission that eliminates clutch operation and automates gear changes is an automatic transmission that uses a torque converter (hereinafter referred to as a "rucon").

This torque converter allows a car to be operated by operating only two pedals, the accelerator and brake pedals, making it easy to drive even for non-experts. The so-called easy drive has been realized.

C1 Prior art and its problems However, in automobiles equipped with automatic transmissions using such torque converters (hereinafter referred to as torque converter vehicles),
It had the following drawbacks.

1) Torque converter cars use hydraulic circuits to control the transmission, so their 9 mechanisms are complex.

It's expensive. Therefore, in order for an excellent driver to achieve the driving performance of a car with a manual transmission (hereinafter referred to as an M/T car), more detailed control is required, the hydraulic circuit becomes larger, and the cost becomes even more expensive. It becomes something.

2) Torque converter vehicles transmit engine power to the drive wheels via fluid.

M transmits engine power to the drive wheels using a clutch
/Compared to T-cars, the engine power transmission efficiency is poor, leading to lower fuel efficiency.

Slip occurs in the power transmission, making it impossible to obtain acceleration that follows the movement of the accelerator.

3) During braking, the engine brake does not work very well, so torque converter vehicles are required to perform brake operations frequently.

d0Object of the Invention The object of the present invention is to provide an automatic transmission capable of electronically controlling clutch engagement and gear change operations, as an automatic transmission that eliminates the above-mentioned drawbacks of torque converter vehicles.

In particular, the present invention proposes a smooth control method for nine throttle valves.

Example of e0 invention EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention will be described in detail using the drawings.

(3) FIG. 1 is a functional block diagram of an automatic transmission showing an embodiment of the present invention.

In the figure, 1 is the accelerator pedal, 2 is the throttle motor that operates the throttle valve, 3 is the engine,
4 is the clutch, 5 is the transmission.

6 is a solenoid valve of an actuator that drives the clutch and transmission, and 7 is a wheel.

8 is drive (D), neutral (N), reverse (
R) select lever 9 is a throttle motor 2. A control unit 10 that controls the solenoid valve 6 is an indicator that displays the position of the transmission and the like.

The block diagram of FIG. 1 will be explained below.

The control unit 9 includes a lever position signal from the select lever 8, an accelerator depression distortion signal from the accelerator 1, an engine rotation speed signal from the output side of the engine 3, a clutch position signal from the clutch 4, an input shaft rotation speed signal from the input shaft, A vehicle speed signal is input from each vehicle speed sensor. The control unit 9 drives the throttle motor 2 based on the above input/output signals to open and close the throttle valve to control the engine speed, and opens and closes the solenoid valve 6 to control the clutch actuator and transmission actuator (not shown). The clutch 4 is engaged and engaged, and the transmission 5 performs a gear change.

Next, let's talk about the operation of the control unit 9.

It will be explained in more detail. First, when the select lever 8 is placed in the D range, the control unit 9 performs an automatic gear shifting operation in response to a lever position signal. Then, when the accelerator 1 is pressed, the accelerator depression amount signal is compared with a predetermined accelerator depression amount to determine whether to perform slow speed driving or not.
It is determined whether to start and accelerate, and if the vehicle is running at a slow speed, the clutch actuator is controlled by the solenoid valve 6 to put the clutch 4 in a half-clutch state. Also.

When the vehicle starts and accelerates, the clutch 4 is completely disengaged and the gear is changed. When changing gears (5), the control unit 9 detects the throttle valve opening from the accelerator position, detects the vehicle speed using the vehicle speed sensor, and changes gears according to the shift map shown in FIG.

FIG. 2 is called a shift map, which uniquely determines the shift point from the vehicle speed and throttle valve opening.

In the figure, the vertical axis represents the throttle valve opening degree as a percentage, with 100% when the throttle valve is fully opened, and the horizontal axis represents the vehicle speed (km'/h). In addition,
Of the speed change curves during deceleration.

The curves from 5th gear to 4th gear and from 4th gear to 3rd gear are omitted to avoid complexity.

As shown in this figure, the shift point can be uniquely determined by the opening degree of the throttle valve, that is, the engine load, and the vehicle speed. Here, there is a difference between the shift point during acceleration (the point where the gear changes from low gear to high gear) and the shift point during deceleration (the point where the shift changes from high gear to low gear). If gears are changed frequently, driving becomes unstable, so this is provided to prevent this.

Generally, automatic transmissions change gears according to the speed change map shown in FIG. 2, and the automatic transmission according to the present invention also changes gears according to this speed change map.

Gear change control by the control unit 9 is performed as follows. First, when the shift point is reached according to the map shown in Figure 2 based on the accelerator depression amount signal and vehicle speed signal, the clutch actuator is controlled by the solenoid valve 6, and the throttle valve is adjusted to prevent the engine 3 from revving up, regardless of the accelerator depression amount. Close. When it is detected by the clutch position signal that the clutch 4 is completely disengaged, the solenoid valve 6 controls the transmission actuator to change the gear of the transmission 5 to the optimum gear position of the input shaft according to the speed change map. When the gear change is completed, the solenoid valve 6 controls the clutch actuator to connect the clutch 4. At this time, the throttle motor 2 is controlled (7) to adjust the throttle valve so that a throttle opening degree corresponding to the amount of accelerator depression is obtained. In the D range, one or more operations are performed while checking the appropriate gear position using the shift map.

By the way, in such an electronically controlled automatic transmission, the accelerator pedal and the throttle valve are not directly connected by wires or link mechanisms as in the past, but are controlled via an electronic control circuit. The relationship between the two (response characteristics) can be set arbitrarily.

The present invention focuses on this and aims to optimize ride comfort, fuel efficiency, and power performance by controlling the opening and closing of the throttle valve at the optimal opening and closing speed according to the driving conditions at the time. be.

FIG. 3 is a block diagram of one embodiment of the present invention.

The same symbols as in FIG. 1 represent the same things. Further, 90 is a throttle valve control section, which may be considered as a part of the control unit 9 in FIG.

In the figure, 91 is a throttle speed map.

92 is a comparator, and 93 is a counter.

(8) The throttle speed map 91 is a map that determines the optimal opening/closing speed of the throttle valve according to the driving conditions and the driver's intention.

(1) Depending on the current position of the throttle valve, the throttle speed is reduced at throttle positions where torque changes are large due to engine characteristics.

(2) Depending on the opening/closing direction of the accelerator pedal 1, it is slow in the closing direction and fast in the opening direction.

(3) Depending on the gear position of the transmission 5, it is slow in low gears where the torque is large and fast in high gears.

(4) Depending on the selector position of the select lever 8.

In power mode and engine braking positions, make it faster to improve response.

(5) Depending on the amount of depression of the accelerator pedal, characteristics are determined such that the kickdown is accelerated to improve responsiveness.

The amount of depression of the accelerator pedal 1 is given by a potentiometer. It is also assumed that a pulse motor is used as the throttle motor, and a rotation angle proportional to the number of (9) pulses applied is obtained.

The map 91 outputs a signal value indicating the optimum throttle opening/closing speed according to various parameters provided. It is assumed that calculation control of the optimum throttle opening/closing speed is performed at a constant cycle, and therefore, the above signal value can be considered to indicate the rotation angle of the pulse motor to be rotated during the constant cycle, that is, the number of pulses.

The pulse motor 2 includes a drive circuit, and when a number of pulses is given, it creates drive pulses of that number each time to rotate the motor. Also, the direction of rotation is determined by the comparator 92.
Controlled by output instructions.

A counter 93 indicates the rotational position of the pulse motor, and accumulates values indicating the number of pulses from the map 91. At this time, when the output of the comparator 92 specifies the open direction, addition is performed, and when the output of the comparator 92 specifies the closed direction, subtraction is performed.

The comparator 92 determines the control direction of the throttle valve, and compares the target opening degree of the throttle valve, which is uniquely determined from the depression angle of the accelerator pedal (10), with the value of the counter 93, and determines whether the former is large. When the latter is large, it indicates the open direction, and when the latter is large, it indicates the close direction.

According to the above configuration, if the value indicating the number of pulses output from the map 91 at each fixed period is large, the throttle valve responds quickly, and if the value is small, the throttle valve responds slowly.

Note that the throttle valve includes not only a throttle valve in a carburetor but also an injection amount control mechanism in a fuel injection device.

f1 Effects of the Invention According to the present invention, the opening/closing speed of the throttle valve is optimally controlled according to various driving conditions, making it possible to prevent unnecessary shocks and jerky movements. There is no request to operate the accelerator pedal.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an automatic transmission to which the present invention is applied, and FIG. 2 is an embodiment of a speed change map. FIG. 3 is a block diagram showing one embodiment of the present invention. In FIG. 3, 90 is a throttle valve control section, 91
92 is a comparator, and 93 is a counter.

Claims (1)

[Claims] In an automatic transmission equipped with an electronic control device that detects the amount of depression of an accelerator pedal and controls the opening degree of a throttle valve according to the amount of depression, the opening/closing speed when controlling the opening/closing of the throttle valve is controlled by the vehicle. A throttle valve control method characterized by changing the throttle valve based on a signal indicating the running condition of the throttle valve.