JPS5881256A - Control device for automatic speed changer for car - Google Patents

Abstract

PURPOSE:To prevent shift shuck during drive by prohibiting the shifting operation until a subsequent increase of the amount of stamping is obtained, in case the stamping amount of accelerator pedal is reducing at a rate exceeding the specified deceleration. CONSTITUTION:In this automatic speed changer, a micro-computer 1, into which output signals from a car speed sensor 2 and a throttle sensor 3 are fed, decides which shift position shall be set according to the speed-change pattern determined previously, and this is used to make On/Off control of solenoids 4, 5 for changing the speed. At this time, the micro-computer 1 makes operation about the rate of change in the opening of throttle, i.e. the changing speed, on the basis of output signal from the throttle sensor 3. When deceleration of the opening of throttle exceeds a certain specified value, the shifting operation with the speed change gear is prohibited until the subsequent increase of the opening of throttle is obtained. Thereby shift shock given by quick release of accelerator pedal can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling an automatic transmission used in a vehicle such as an automobile.

Automatic transmissions for vehicles generally include a gear transmission mechanism that changes between multiple gears, and the cough-skewer transmission mechanism changes the vehicle's output depending on the vehicle speed and the amount of accelerator pedal depression (throttle opening). The gear speed of the gear transmission mechanism is automatically changed according to a predetermined speed change pattern in a manner that achieves a balance between performance and fuel efficiency.

In the shift pattern set in the manner described above, the shift point of the gear transmission mechanism shifts toward higher vehicles as the amount of depression of the accelerator pedal increases. Therefore, even if the vehicle speed is constant, an upshift may occur when the amount of accelerator pedal depression decreases, and this upshift does not cause a large shift shock when the accelerator pedal is gradually released. When the accelerator pedal is suddenly released and the speed at which the accelerator pedal depression is reduced is fast, the engine's output torque suddenly decreases, resulting in a large shift shock and a rattling noise in the vehicle drive system. This causes abnormal noise and worsens the driving feeling of the vehicle.

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problems in conventional automatic transmissions, and aims to provide a method for controlling gear change of a gear transmission mechanism of an automatic transmission for a vehicle in order to solve the problem. .

According to the present invention, it is an object of the present invention to provide a method for controlling an automatic transmission for a vehicle that includes a gear transmission mechanism that changes between a plurality of gears, and to provide a method for controlling an automatic transmission for a vehicle that includes a gear transmission mechanism that changes between a plurality of gears. Based on this, the gear transmission mechanism is set to switch between the plurality of gears, and when the accelerator pedal depression amount decreases by a predetermined reduction speed or more, the input signal is changed until the accelerator pedal depression amount increases next time. This is achieved by a control method characterized by prohibiting the gear from being changed over the underlying gear change control.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing the configuration of an apparatus for carrying out the method of controlling an automatic transmission for a vehicle according to the present invention. As shown, a microcomputer 1 is used to implement the control method of the present invention, and the microcomputer receives several input signals and outputs several output signals for automatic transmission control. It has become. In the illustrated embodiment, a signal regarding the vehicle speed is supplied from the vehicle speed sensor 2, and a signal regarding the throttle opening is supplied from the throttle sensor 3, and based on these input signals, the gear transmission mechanism is operated according to the vehicle speed and the throttle opening. It determines which gear stage to set according to a predetermined shift pattern, and outputs an on signal or an off signal to each of the solenoids 4 and 5 accordingly.

By individually applying an on signal or an off signal to the solenoid 4.5, the -rate transmission mechanism is switched to four speeds, ie, first speed, second speed, and third speed.

FIG. 2 is a diagram showing an example of a speed change pattern of the above-mentioned skewer speed mechanism. In Fig. 2, execution 1→2.2→3 are upshift lines from 1st speed to 2nd speed and from 2nd speed to 3rd speed, respectively, and broken lines 1←2.2←3 are respectively This is a downshift line from 2nd speed to 1st speed and from 3rd speed to 2nd speed.

The microcomputer 1 receives the signal regarding the throttle opening given from the throttle sensor 3, and calculates the rate of throttle reduction, in other words, the rate of change, by calculation, and when the low speed of the throttle is equal to or higher than a predetermined value, Next, the gear shift mechanism is prohibited from changing gears until the throttle speed is increased once. Third
The figure shows a flowchart for the gear change prohibition control.

Assume that the manual shift range of the automatic transmission is set to the D range, the throttle opening is O, and the vehicle speed is O, that is, the vehicle is being driven at idle. The gear position of the gear transmission mechanism at this time is the first speed. From this state, the accelerator pedal is depressed and the throttle speed increases, the state shifts to the state shown by ad in FIG. Then, the pressure on the straw accelerator pedal is suddenly released, and the throttle opening becomes O.
When the throttle opening reaches the 0 point, the gear transmission mechanism attempts to shift up from 1st gear to 2nd gear by crossing the 1→2 shift up line during the throttle opening reduction process, but at this time, the gear transmission mechanism attempts to shift up from 1st gear to 2nd gear. When the reduction speed is equal to or greater than a predetermined value, the -heavy speed mechanism is held at the first speed, and that gear position is held until the next throttle opening is increased. In this way, when the throttle opening is reduced above a predetermined reduction speed, shifting of gears in the gear transmission mechanism is prohibited, thereby avoiding large shift shocks and abnormal noises, and improving the drive feel of the vehicle. Rings will now be improved.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto, and those skilled in the art will recognize that various modifications can be made within the scope of the present invention. It would be obvious for

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of a device for explaining the control method of an automatic transmission for a vehicle according to the present invention, FIG. 2 is a diagram showing a shift pattern of a gear transmission mechanism, and FIG. 1 is a flowchart showing one embodiment of a control method of the invention. 1...Microcomputer, 2...Vehicle speed sensor. 3...Throttle sensor, 4.5-...Solenoid.

Claims (1)

[Claims] A method for controlling an automatic transmission for a vehicle including a gear transmission mechanism that can be switched to - of a plurality of gears, wherein the - ratio changing structure is combined with a plurality of input signals including signals related to vehicle speed and accelerator pedal depression amount. Set to switch to multiple gears,
At this time, when the accelerator pedal depression amount is reduced by a predetermined reduction speed or more, the gear shift control is prohibited to override the gear shift control based on the input signal until the accelerator pedal depression amount increases next time. , and a control method characterized by.