JPH09123791A - Automobile speed control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate free running time by holding running speed at hunting speed when a brake operation detecting means detects that the second stage of operation is under way. SOLUTION: The stage of operation of a brake pedal is judged based on inputs from a brake pedal switch and a brake oil pressure sensor (step S5), and if the brake pedal switch is off and the brake pedal is not being operated, the stage of operation of the brake is judged to be the first stage, and acceleration up to a learned hunting speed is accomplished (step S6). If the brake pedal switch is on and the brake oil pressure sensor is off, the stage of operation of the brake is judged to be the second stage, and vehicle speed is held at the current value (step S7). If the brake pedal switch is on and the brake oil pressure sensor is on, the stage of operation of the brake is judged to be the third stage, and normal braking is effected (step S8).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed control device for controlling a vehicle speed during follow-up operation of a preceding vehicle.

[0002]

2. Description of the Related Art Conventionally, during follow-up operation to a preceding vehicle, for example, during a traffic jam, speed control is performed by stepping on an accelerator pedal and a brake pedal.

In the above-described conventional speed control by operating two pedals, the load on the driver increases and idle running time occurs when the driver changes the pedal, so that the handling may be delayed when the preceding vehicle makes a sudden braking. There is a problem.

As a solution to this problem, there is an automatic traveling device (auto cruise device) adapted to carry out follow-up traveling on the basis of the inter-vehicle distance from the preceding vehicle.

[0005]

However, in the above-described conventional automatic traveling device that follows the vehicle based on the distance between the preceding vehicle and the preceding vehicle, a sensor or the like for detecting the distance between the preceding vehicle and the like is required. There is a problem that

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a vehicle speed control device capable of eliminating idle time and reducing costs.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a follow-up detecting means for detecting follow-up running to a preceding vehicle, a first step in which a brake pedal is operated, a stop lamp is turned on. And the following operation is detected by the brake operation detecting means for detecting which of the second step in which the braking oil pressure is not generated and the third step in which the braking oil pressure is generated, and the following operation is detected by the following operation detecting means. An acceleration means for accelerating the traveling speed to the following speed when the operation step is detected to be the first step by the means;
When the follow-up running is detected by the follow-up detecting means and the operation step is the second step by the brake operation detecting means, a vehicle speed holding means for holding the running speed at the follow-up speed is provided. I am trying.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams for explaining a vehicle speed control device according to an embodiment of the present invention, FIG. 1 is a block diagram of the speed control device, and FIG. 2 is a flowchart for explaining the operation of the device. It is a figure.

In the drawings, reference numeral 1 denotes a vehicle speed control device according to the present invention. The speed control device 1 includes a throttle opening sensor 2 for detecting a throttle opening, and a brake pedal switch which is turned on when a stop lamp (not shown) is lit according to the depression amount of a brake pedal connected to a hydraulic braking system. 3, a control oil pressure detection sensor 9 for detecting the occurrence of the control oil pressure, a vehicle speed sensor 4 for detecting the traveling speed, and a follow-up switch (cruise switch) 5 that is turned on when following the preceding vehicle. Is equipped with.

Further, a throttle actuator 6 for electrically controlling the output of the engine by increasing / decreasing the intake air amount by adjusting the opening of the throttle valve of the engine, and a shift control actuator for controlling the automatic transmission of the vehicle. 7 are provided.

Then, the ECU 8 uses the above-mentioned sensors 2, 4,
The traveling state of the vehicle is determined based on signals from 9 and the switches 3 and 5, and the actuators 6 and 7 are controlled according to the determination result.

Next, the speed control device 1 will be described with reference to FIG.
Will be described. When the driver turns on the follow-up switch 5 in a traffic jam or the like and it is detected that the vehicle is following the preceding vehicle, the average vehicle speed is learned and sequentially stored and updated (step S1). . The vehicle speed when the accelerator pedal and the brake pedal are changed from the depressed state to the released state is sequentially taken in as the vehicle speed data, and the average vehicle speed is learned based on these.

Then, if the accelerator pedal is depressed, acceleration as normal traveling is performed according to the depression amount (steps S2 and S3). In addition, the following switch 5
If is off, the process is terminated, and if it is on, the process returns to step S1.

If the accelerator pedal is not depressed in step S2, the step of depressing the brake pedal is judged based on inputs from the brake pedal switch 3 and the braking oil pressure detection sensor 9 in step S5.

In step S5, if the brake pedal switch 3 is off and the brake pedal is not stepped on, it is determined that the step of depressing the brake is the first step, and the ECU 8 performs the learning. The vehicle is accelerated to the following speed (average vehicle speed) (step S6), and if the cruise switch remains on in step S4, the process returns to step S1 and the process is repeated.
In step S6, the throttle is opened until the following speed is reached, and then the throttle opening is adjusted so that the following speed is maintained. In step S6, when the traveling speed at that time is higher than the following speed, the vehicle speed at that time is held.

In step S5, when the brake pedal switch 3 is on and the braking oil pressure detection sensor 9 is off, the ECU 8 determines that the step of depressing the brake is the second step. The vehicle speed is maintained at (step S7), and the process of step S4 is performed. It should be noted that in step S7, the throttle opening is maintained to such an extent that the engine brake does not decelerate.

In step S5, when the brake pedal switch 3 is turned on and the braking oil pressure detection sensor 9 is turned on, the step of depressing the brake is the third step.
It is determined to be a stage, normal braking is performed (step S8), and the process proceeds to step S4.

As described above, the operation stage of the brake pedal is not operated, only the foot is placed, and the first to third stages of braking are distinguished, and the traveling speed is controlled according to the operation stage. Therefore, it is possible to follow the constant speed just by placing the foot on the brake pedal, and it is possible to eliminate the idle time due to the change of the brake and the accelerator, and it is also possible to detect the distance between the preceding vehicle and the vehicle. It is possible to eliminate the need for a sensor or the like that operates and reduce the cost.

[0019]

As described above, according to the vehicle speed control device of the present invention, if the brake pedal is not depressed during the following running, the vehicle accelerates to the following speed, the stop lamp lights up during the following running, and If the braking hydraulic pressure is not generated, the speed at that time is maintained, so it is possible to follow the constant speed just by placing the foot on the brake pedal, and idle running by switching the accelerator pedal and the brake pedal. There is an effect that time can be saved, and a cost can be reduced because an inter-vehicle distance sensor can be eliminated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle speed control device according to an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the apparatus of the above embodiment.

[Explanation of symbols]

1 speed control device 5 follow-up switch (following detection means) 8 ECU (brake operation detection means, acceleration means, vehicle speed holding means)

Claims (1)

[Claims] 1. A follow-up detecting means for detecting follow-up traveling to a preceding vehicle, and a step of operating a brake pedal, the first step in which the brake pedal is not depressed, a stop lamp is turned on, and a braking hydraulic pressure is not generated. Brake operation detecting means for detecting which of the second step and the third step the braking hydraulic pressure is generated, and the follow-up detecting means detect follow-up running, and the brake operation detecting means provides the first operation step. Is detected, the follow-up running is detected by the acceleration means for accelerating the running speed to the follow-up speed, and the follow-up running is detected by the follow-up detecting means, and the operation step is detected as the second step by the brake operation detecting means. A vehicle speed control device, comprising: a vehicle speed holding means for holding the traveling speed at a follow-up speed when the vehicle travels.