JPS61274157A - Apparatus for preventing slip of car on slope which is equipped with automatic transmission - Google Patents

Abstract

PURPOSE:To suppress over-torque and prevent slip and lateral slip by controlling the speed change by the opening degree signal of an accelerator during the time when a car travels on a curved slope, thus securing the speed change control over the second speed without realizing the shift down, even if the accelerator is excessively stepped down. CONSTITUTION:When car speed is within a specific range, the output signals S1 and S2 of an inclination-angle detector 10 and a revolution angle detector 30 for a steering wheel are input into a controller 40. Said controller 40 judges, from the both signals S1 and S3, if a car travels on a curved slope or not. Therefore, when the traveling on the curved slope is judged, the controller 40 outputs a speed change control signal S4 so that the speed change state at that time is maintained when the opening degree signal S2 of an accelerating pedal 21 is within the range where a speed change means 50 is shift-down- operated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for driving an automobile equipped with an automatic transmission on a slope.
This invention relates to a slip prevention device that prevents slips and sideslips caused by overtorque.

[Prior Art] Conventionally, automobiles equipped with automatic transmissions usually run in third or fourth gear on flat roads.

When the accelerator pedal is pressed hard, the system automatically downshifts to increase acceleration. Also, at low speeds and when starting, the vehicle is designed to run in first gear.

[Problems to be solved by the invention] However, on a slope with many curves, if the accelerator pedal is depressed too much and the vehicle is traveling in 1st gear or higher, the driver may downshift and generate excessive acceleration force, resulting in slipping or slipping. This causes sideslip, etc. Also, even when the vehicle is running in first gear, overtorque may similarly cause sideslip. Therefore, the present invention was made to improve the drawbacks of the conventional automatic transmission, and aims to prevent slips caused by overpressing the accelerator pedal on slopes, and the accompanying slips. purpose.

[Technical means for solving the problem] FIG. 1 is a block diagram showing the concept of the present invention.

The present invention includes: an inclination angle detector 10 that detects the inclination of a road surface; a rotation angle detector 30 that detects the rotation angle of a steering wheel 31; an opening degree detector 20 that detects the opening degree of an accelerator pedal; The angle detector 10 inputs the output signals @81, 83 from the rotation angle detector 30 and determines from those signals whether the road is a curved slope, and in that case, the opening degree detector A slope slip of an automobile equipped with an automatic transmission device comprising: a control device 40 that outputs a speed change control signal S4 based on the speed change control signal S4 of the control device ff140; and a speed change means 50 that changes speed according to the speed change control signal S4 of the control device ff140. It is a prevention device.

Here, the inclination angle detector detects the inclination of the road surface, and a pendulum-type clear inclination angle detector attached to the vehicle body or the like can be used. As the opening degree detector, a potentiometer, a rotary encoder, or the like can be used to detect the opening degree of the accelerator pedal, that is, the opening degree of the throttle valve. control@
The installation is mainly realized by computer systems. As for the mode of shift control, if the value detected by the inclination angle detector is greater than or equal to a predetermined value, and the rotation angle detected by the rotation angle detector is greater than or equal to a predetermined value, it is determined that the road is a curved slope. Then, for example, if the output of the accelerator pedal opening detector is greater than or equal to a predetermined value and less than a predetermined value, even if the output is in second gear or
One idea is to prevent the vehicle from downshifting to first gear even if the vehicle is running in third gear. It is also possible to detect the depression speed of the accelerator pedal and, if the detected speed is equal to or higher than a predetermined value, maintain the gear shift state and prevent downshifting. In this way, the operating state of the accelerator pedal is determined in order to determine whether or not there is an overtorque state.

[Operation] Signals from each detector are input to the control device and processed. The control device outputs a speed change control signal to the speed change means when a predetermined condition is satisfied, thereby making the speed change step appropriate. The predetermined conditions are that the vehicle is on a slope and the steering wheel is rotated by a predetermined angle or more.

This determines that the road is a curved slope. When this condition is met and the operation state of the accelerator pedal, such as opening degree and depression speed, is within a predetermined range, control is performed to the second speed or higher.

As a result, slips on curved slopes and the resulting burrs of the vehicle body are prevented. If the predetermined operating state is not in place, the conventional gear shift 11JII] system is activated, and, for example, when the accelerator pedal is depressed to the maximum limit, it is possible to control il+ to shift to 1st gear. .

[Example] The present invention will be described below based on a specific example.

FIG. 2 is a block diagram showing the configuration of an apparatus according to an embodiment of the present invention. The inclination angle detector 10 that detects the inclination of the road surface includes a semicircular fixed plate 11 fixed to the vehicle body,
It has a pendulum 13 that can swing about a shaft 12 with respect to the fixed plate 11. A sliding resistor 15 is arranged on the fixed plate 11 in an arc shape. One end of the sliding resistance is
It is connected to the positive terminal of the battery, and the other end is grounded. The fixed plate 11 tilts as the vehicle body tilts, but the pendulum 13
swings relative to the fixed plate 11 around the shaft 12 so as to always face in the vertical direction.

At the tip of the pendulum 13, there is a contactor 14 that comes into contact with the sliding resistance 15.
is provided, and the other end is connected to A via a lead wire 17.
/D converter 16. When the contactor 14 slides on the sliding resistor 15, the value of the voltage signal appearing on the lead wire 17 changes, and the inclination angle of the vehicle body, that is, the inclination angle of the road surface is detected from this voltage value. The voltage value is converted into a digital signal by the A/D converter 16 and is converted into a tilt angle signal S1.
is input into the input interface 42 as follows.

The opening degree detector 20 that detects the opening degree of the accelerator pedal includes contacts 21a, 21b, and 21b provided on the accelerator pedal 21.
The potentiometer 22 includes a sliding resistor 22a and a sliding conductor 22b that are in sliding contact with the potentiometer 22. The sliding resistor 22a has one end connected to the battery and the other end grounded. The sliding conductor 22b is connected to a lead wire 24, and the voltage signal on the lead wire is input to the A/D converter 23, which converts the opening signal $
2 is output to the input interface 42.

The rotation angle detector 30 that detects the rotation angle of the steering wheel is composed of a photo-interval 33 provided on the steering shaft 32 and a counter 34 into which the output signal thereof is input. The bottom interrupter 33 is configured to detect the neutral point of the steering shaft 32.
The detection signal resets the counter 34. The photointerrupter 33 outputs a pulse signal according to the rotation layer and direction of the steering shaft 32, and outputs a pulse signal to the counter 3.
4 counts these pulses and applies them to the steering shaft 3.
2 and outputs a rotation angle signal s3 to the input interface 42.

In this embodiment, a vehicle speed detector is provided. It is composed of a magnetic pole plate 61 that rotates as the speedometer cable rotates, a reed switch 62 that turns on and off as the speed meter cable rotates, and a counter 63 that counts the output signal. The counter 63 is reset by the CPLI 41 at regular intervals, detects the number of pulses within a unit time, that is, the vehicle speed, and outputs a vehicle speed signal S5 to the input interface 42.

The control device 21240 includes an input interface 42, a CPU
41, an output interface 43, and a ROM/RAM 44 for storing programs and data.

The transmission means 50 includes a drive unit I51 including a solenoid for shifting a transmission gear and a circuit for driving the solenoid, and a transmission 52.
It is made up of.

The device of this embodiment has the above configuration.

Next, its operation will be explained based on the flowchart of FIG. 3 showing the processing of the CPLI 41. This program is executed by interrupting the main program for normal speed change processing. When an interrupt occurs, CPLJ begins execution at step 100. Step 100 is
This is an initial set step. In step 102, the current vehicle speed V is input from the counter 63. Step 10
4, when the vehicle speed ■ is smaller than the predetermined value C, the speed change process of the present invention is performed. When the value is larger than the predetermined value, it is determined that the vehicle is in a normal driving state, and the main program for performing the gear change operation of the conventional device is returned to without performing any special gear change processing. When driving at low speed, the process moves to step 106 and the A/D
The inclination angle α of the road surface is input through the converter 16, and the rotation angle θ of the steering shaft 32 is input in step 108. In step 110, the inclination angle is compared with a predetermined value A, and if it is small, the process moves to step 106 and no special speed change processing is performed. If the rotation angle is larger, the process moves to step 112 and the rotation angle is compared with a predetermined value 8, and if it is smaller, the process returns to step 106 and no special speed change processing is performed. When the rotation angle is larger than the predetermined value, the process moves to step 114. In other words, it is detected that the slope of the road surface is greater than a certain value and that the vehicle is being steered by more than a certain angle. In this case, it can be considered that the vehicle is on a slope with a curve, so if the accelerator pedal is pressed too hard in this state, there is a possibility that the vehicle will skid or skid.

In step 114, the opening degree β of the accelerator pedal is read from the A/D converter 23. In step 116, the opening degree β
It is determined whether or not is within a predetermined range, and if it is within a predetermined vi range, the process moves to steps 118 and 119, and a signal for maintaining the gear change state of the transmission 52 is output to the drive device 51. In a conventional device, in such a case, the gear is downshifted, resulting in overtorque, which tends to cause slips and skidding.

This device can prevent slips and skidding on slopes with many curves by controlling the generation of overtorque due to downshifts.

If the opening degree of the accelerator pedal is not within the predetermined range in step 116, and the operating state of the accelerator pedal is not in the predetermined state, that is, outside the state that causes overtorque, the main program is returned to and main shift control is performed. It will be done. for example,
If the opening degree β is smaller than the lower limit P and the accelerator pedal is depressed the most, there is insufficient torque, so the driver intentionally shifts down the accelerator pedal to increase torque. It is also possible to downshift, assuming that the gear has been operated. Further, when the opening degree of the accelerator pedal is larger than the upper limit value, the accelerator is not depressed so much that overtorque does not occur, and therefore the shift processing of the main program is followed.

The device of this embodiment operates as described above.

[Effects of the Invention] As described above, the present invention includes a tilt angle detector that detects the slope of the road surface, a rotation angle detector that detects the rotation angle of the steering wheel, and an opening degree that detects the opening degree of the accelerator pedal. A detector is provided, and it is determined from these detection signals whether the road is a curved slope, and in that case, speed change control is performed based on the detection signal of the opening degree detector. be.

Therefore, even if the accelerator pedal is depressed too much on a slope with many curves, the gear shift is controlled to 2nd speed or higher, so overtorque does not occur, and slips and skidding can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the concept of the present invention, Fig. 2 is a block diagram showing the configuration of a device according to an embodiment of the present invention, and Fig. 3 is a block diagram showing the configuration of a device according to an embodiment of the present invention.
3 is a flowchart showing processing of PU. 11... Fixed plate 13... Pendulum 14... Contactor 15... Sliding resistance 21... Accelerator pedal 22... Potentiometer 22a... Sliding resistance 22b... Sliding Is body 32・
... Steering shaft 33 ... Photo interrupter

Claims (1)

[Scope of Claims] An inclination angle detector that detects the inclination of a road surface; a rotation angle detector that detects the rotation angle of a steering wheel; an opening degree detector that detects the opening degree of an accelerator pedal; and the inclination angle detector. input the output signals from the rotation angle detector and determine from those signals whether the road is a curved slope, and in that case, based on the detection signal of the opening degree detector, a control device that determines the operation state of an accelerator pedal and, when the state is a predetermined state, outputs a shift control signal to maintain the current shift state; and a shift means that changes gears based on the shift control signal of the control device. A slope slip prevention device for an automobile equipped with an automatic transmission.