JPH0633814B2 - Automotive automatic transmission control system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle automatic transmission control system, and more particularly to a vehicle automatic transmission control system for performing engine brake control by detecting a play area of a brake pedal operation during deceleration. Regarding

[Conventional technology]

Conventionally, there is a method of automatically performing shift control for switching a shift gear in response to acceleration or deceleration of an automobile by using an automatic transmission in addition to manually switching the shift gear.

If you switch to a low speed gear that is one step lower than the speed change gear corresponding to the speed of the car, the engine brake will be applied and the car will start to decelerate. For deceleration by engine braking of a vehicle equipped with an automatic transmission, the sensor detects the depth of depression of the accelerator pedal and the depth of depression of the brake pedal, and the accelerator pedal is not depressed and the brake pedal is depressed. Is detected, the gear of the automatic transmission is switched to the low speed gear one step lower by the control of the transmission control device.

[Problems to be Solved by the Invention]

In the above-described conventional automatic transmission control system for an automobile, when the accelerator pedal depression and the brake pedal depression are not detected, the transmission gear is maintained as it is because it is in the inertia traveling state.

However, the operation of the brake pedal includes an area of play in which braking is not performed even when the brake pedal is depressed, so that the depression of the brake pedal is detected for the first time at the depressed position, that is, the operation area of the brake, beyond this area. Has become.

Therefore, braking by the engine brake is delayed, and in order to stop the vehicle early, it is necessary to depress the brake pedal so strongly that there is a problem that speed adjustment is likely to lack smoothness.

An object of the present invention is to provide an automatic transmission control system for a vehicle that can smoothly adjust the speed during deceleration.

[Means for Solving the Problems]

An automatic transmission control system for an automobile according to the present invention includes a brake play area depression depth detection sensor for detecting a depression depth by dividing a play area at the time of depression of a brake pedal into at least two.
Brake operation area depression depth detection sensor for detecting the depression depth of the operation area of the brake pedal, a brake play area depression depth detection signal sent from the brake play area depression depth detection sensor and the brake operation area depression depth detection sensor And a transmission control device for transmitting a shift command signal for shifting to a transmission gear having a lower speed to the automatic transmission each time the received brake operation area depression depth detection signal is received, and performing shift control of the automatic transmission. Is configured.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

The automatic transmission control system for an automobile according to the present embodiment has an accelerator depression depth detection sensor 2 for detecting a depression depth of an accelerator pedal 6, and a brake play area depression depth for detecting a depression depth of a play area divided into two parts of a brake pedal 7. It is composed of a detection sensor 3, a brake operation area depression depth detection sensor 4 for detecting a brake braking start point, and a transmission control device 1 for sending a shift command signal 14 to an automatic transmission 5 based on a detection signal of each sensor.

FIG. 2 is an operation diagram showing the relationship between the depression depth of the brake pedal 7 and the braking force in this embodiment.

As shown in FIG. 2, when the brake pedal 7 is stepped on, there is initially play of the brake pedal 7 (brake play area BC shown in FIG. 2), so the braking force by the brake pedal 7 does not occur, but the brake When the brake pedal 7 is stepped on to the braking start point, the braking force of the brake is generated, and the braking force of the brake increases as the brake pedal 7 is stepped on.

In the above, the driver steps on the brake pedal 7,
When the brake pedal 7 is slightly stepped on, the brake play area depression depth detection sensor 3 shown in FIG. 1 detects a boundary point between the play areas divided into two, and the brake play area depression depth detection signal 12 is transmitted to the transmission. It is sent to the control device 1. Further, when the brake pedal 7 is stepped on and the brake braking start point is reached, the brake operating area stepping depth detection sensor 4 detects that the vehicle has entered the braking area, and the brake operating area stepping depth detection signal 13 is sent to the transmission control device 1. Sent out.

FIG. 3 is an operation diagram showing an operation at the time of acceleration operation and deceleration operation of this embodiment.

First, in the acceleration state in which the accelerator pedal 6 is depressed by a certain amount to accelerate the vehicle, the position of the transmission gear in the automatic transmission 5 is shifted from the second speed to the third speed according to the speed of the vehicle. Then, even if the pedaling force of the accelerator pedal 6 is relaxed and the pedaling depth is reduced to zero to set the pedaling depth to zero, the position of the transmission gear is set to the fourth speed according to the speed corresponding to the pedaling depth until then. The car is shifted and the car continues to run in this state.

Here, when the driver puts his / her foot on the brake pedal 7 for deceleration and the brake pedal 7 slightly moves, the brake pedal 7 is depressed by the brake play area depression depth detection sensor 3 shown in FIG. The entry into the area is detected, and the brake play area depression depth detection signal 12 is sent to the transmission control device 1. Since the transmission control device 1 that has received this signal has already detected that the accelerator pedal depression depth detection sensor 2 is away from the accelerator pedal 6 and has sent it as the accelerator pedal depression depth detection signal 11,
A shift command signal 14 for reducing the vehicle speed is sent to the automatic transmission 5. Upon receipt of the shift command signal 14, the automatic transmission 5 shifts the gear position to a gear (third speed gear) that is one step lower than the speed change gear (fourth speed gear shown in FIG. 3) at that time. Therefore, the vehicle is controlled by engine braking.

When the brake pedal 7 is further depressed, the brake operation area depression depth detection sensor 4 detects the brake pedal braking start point, and the brake operation area depression depth detection signal 13 is sent to the transmission control device 1. The transmission control device 1 sends a shift command signal 14 to the automatic transmission 5, and the automatic transmission 5 shifts the gear position to a gear (second speed gear) having a speed one step lower than that of the transmission gear at that time. This gear shift further applies engine braking.
In this way, the gears are shifted earlier and the deceleration is performed more smoothly than in the case of the conventional technique shown by the alternate long and short dash line in FIG.

It should be noted that the above-described gear shift control device 1 has functions such as receiving the detection signals of the respective sensors and transmitting the gear shift command signal 14 to the automatic transmission 5 based on these signals. Program.

As described above, when the brake pedal 7 is stepped on, the position of the brake pedal 7 is detected while the state of depression is within the play area, and the position of the transmission gear is shifted to a gear with a further lower speed. The speed can be adjusted smoothly by applying the engine brake.

In the above description, the depression depth of the accelerator pedal 6 and the depression depth of the brake pedal 7 are constantly detected, and when the accelerator pedal 6 is not depressed and the brake pedal 7 is depressed, the transmission control device 1 Control by automatic shift 5
It is described that the gear is switched to the low speed gear which is one step lower, but it can be performed only by detecting the depression depth of the brake pedal 7 without detecting the depression depth of the accelerator pedal 6.

Further, the depression depth of the play area when the brake pedal 7 is depressed is divided into two, and the depression depth of the brake pedal 7 is detected at the divided points. If the depth of depression of the brake pedal 7 is detected and the transmission gear is shifted to a low speed gear, the effect of deceleration by engine braking can be obtained earlier.

〔The invention's effect〕

As described above, according to the present invention, the play area when the brake pedal is stepped on is divided into at least two, and it is detected that the depth of stepping of the brake pedal is at the boundary of this area and the engine braking is performed, thereby smoothing the operation. It has the effect of speed adjustment.

[Brief description of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is an operation diagram showing the relationship between the depression depth of the brake pedal 7 and the braking force of this embodiment, and FIG. 3 is the acceleration operation of this embodiment. FIG. 6 is an operation diagram showing an operation during deceleration operation. 1 ... Transmission control device, 2 ... Accelerator depression depth detection sensor, 3 ... Brake play area depression depth detection sensor, 4
...... Brake operation area depression depth detection sensor, 5 ...... Automatic transmission, 6 ...... Accelerator pedal, 7 ...... Brake pedal, 11 ...... Accelerator depression depth detection signal, 12 ...... Brake play area depression depth detection signal, 13 ...... Brake operating area stepping depth detection signal, 14 ...... Shift command signal.

Claims (1)

[Claims] 1. A brake play area depression depth detection sensor for detecting a depression depth by dividing a play area at the time of depression of a brake pedal into at least two, and a brake operation area depression depth detection for detecting a depression depth of an operation area of a brake pedal. Whenever the sensor and the brake play area stepping depth detection signal sent from the brake play area stepping depth detection sensor and the brake working area stepping depth detection signal sent from the brake working area stepping depth detection sensor are received, the speed is lowered one step lower. An automatic transmission control system for an automobile, comprising: a transmission control device that sends a shift command signal for shifting to a shift gear to the automatic transmission to control the shift of the automatic transmission.