JPH02169332A - Travel controller - Google Patents

Abstract

PURPOSE:To control a car speed with only a brake paddle pedal at time of low speed as well as to aim at simplification and inexpensiveness in structure by constituting it so as to travel at the car speed conformed to the operated variable of a brake at a time when the car speed has set its automatic travel at less than a second setting value. CONSTITUTION:When a fact that an accelerator pedal 5 and a brake pedal 6 are not yet operated each and a parking brake is loosened is detected by a controller 11 on the basis of each output of respective switches 7-9, a throttle actuator 2 of an engine 1 is controlled by this controller 11 according to output of a car speed setting means 4 as an automatic travel setting means. In this case, when automatic travel has been set in the case where the detected value of a car speed sensor 10 is at less than a second setting value, by way of example, the throttle actuator 2 is controlled by the controller 11 so as to travel at the car speed conformed to the detected value of a brake operated-bariable sensor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a travel control device for an automobile.

[Conventional technology]

Conventionally, as a device for controlling extremely low speeds, for example, Japanese Patent Application Laid-Open No. 6
There was one disclosed in Publication No. 2-255252. FIG. 3 shows a block diagram of the above device, in which l is the engine, 2 is a throttle actuator that controls the output of the engine 1, 3 is a brake actuator that controls the brakes, and 4 is a vehicle speed that sets the vehicle speed to a predetermined speed. It is a setting means. 5 is an accelerator pedal, 6 is a brake pedal, and a switch 7.8 provided for each detects that both pedals 5.6 are not depressed. 9 is a parking brake switch that detects that the parking brake is released; 10 is a vehicle speed sensor that detects vehicle speed; and 11 is a controller that controls each of the above components.

Next, the operation will be explained with reference to the flowchart shown in FIG. First, when the creep setting speed is set, the foot is released from the accelerator pedal 5 and the brake pedal 6, and the parking brake is loosened, the creep control condition is established in step S1, and the controller 11 detects this in step S2 and performs creep control. If the vehicle speed is within the range of ±ΔV, the output to the throttle actuator 2 and the output to the brake actuator 3 are maintained as they are.

Here, ΔV is a predetermined speed.

For example, in step S3, the vehicle speeds up at the set vehicle speed -ΔV,
If the brake is operating in the brake state of step S4, the brake is loosened in step S5, and if the brake is not operating, the throttle is opened in step S6 to increase the engine output. If the throttle is opened from the original position as in step S7 when vehicle speed > set vehicle speed + ΔV, the throttle is closed in step S8, and if the throttle is closed, the brake is applied in step 31G to increase the vehicle speed or set vehicle speed ±ΔV. On the other hand, if the throttle is open in step S8, the throttle is closed in step S9, and after steps 35, 59, and 510, the throttle is closed again after the time set by the timer in step Sll. step s
Return to 1. Incidentally, if the creep control condition is no longer satisfied in step S1, the creep control is stopped. That is, the throttle is opened in step S12, and the brake actuator is returned to its original position in step 313.

[Problem to be solved by the invention]

Since the conventional speed control device is configured as described above, the vehicle speed is controlled by simultaneously controlling the brake and the throttle, so there is a problem that the device is large and the cost is high. In addition, the function that controls vehicle speed operates only when the accelerator and brake pedals are released, and the vehicle speed is determined by the set value, so the only way to change the vehicle speed is to change the set value, which is inconvenient to operate. There was also an issue.

This invention was made to solve the above-mentioned problems, and is a simple and inexpensive device that can control vehicle speed from low to high speeds, and has high cost performance.
Moreover, it is an object of the present invention to obtain a traveling side m device that is easy to operate.

[Means to solve the problem]

The travel control device according to the present invention includes a vehicle speed sensor that detects vehicle speed, a slip detection means that detects wheel slip, a throttle actuator that controls engine output, an automatic travel setting means, and a brake depression amount that is detected. and a brake depression amount sensor to control the vehicle to travel at the set speed when automatic travel is set by the automatic travel setting means when the vehicle speed is equal to or higher than a first predetermined vehicle speed;
When automatic driving is set when the vehicle speed is below a second predetermined speed, the vehicle travels at a speed corresponding to the amount of brake pedal depression, and when wheel slip is detected, the engine output is reduced. .

[For production]

In this invention, when automatic travel is set by the automatic travel setting means when the speed is above a certain predetermined speed, the speed at this time is stored and the controller adjusts the engine output to control the vehicle to travel at the set speed. Furthermore, if automatic setting is performed when the speed is below a predetermined speed, the controller controls the engine output so that the vehicle travels at a predetermined speed or a separately set speed. If you press the brake at this time, the amount of brake pedal depression is detected and the engine output is adjusted accordingly. Furthermore, when it detects vehicle slippage, it reduces engine output to stop the slippage and ensure driving force.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows a block diagram of a travel control device according to the present invention,
12 is a brake depression amount sensor that detects the amount of brake depression, 13 is a mode setting switch, 14 is a slip detection sensor that detects wheel slip, and other symbols are the same as the conventional device shown in FIG. The same reference numerals are used to omit the explanation.

The travel control device configured as described above inputs each signal from each component to the controller 11, and the controller processes these signals and outputs them to the throttle actuator 2, which opens and closes the throttle valve and adjusts the output of the engine 1. It is to control.

Next, the operation according to the present invention will be explained with reference to the flowchart of FIG. The functions of this device are a combination of a constant speed driving function at high speeds, a low speed driving control function during times of traffic congestion, and a driving force control function when the wheels slip. First, when the mode setting switch 13 is turned on in step S1, when the vehicle speed is a predetermined speed, for example, 40 km/h or more in step S2, the throttle actuator is activated so that the vehicle maintains the speed at which the mode setting switch 13 was turned on in step S3. The output of the engine is controlled by operating 2.

Next, in step S4, when the vehicle speed is less than a second predetermined speed, for example, 20 km/h, the vehicle enters a low-speed driving mode, and the vehicle speed is set by the vehicle speed setting means 4, and the accelerator pedal 5. If you take your foot off the brake pedal 6 and loosen the parking brake, the vehicle will maintain the set speed (step S).
5) If the parking brake is applied, the parking brake switch 9 is turned on in step S5, and if the accelerator pedal is not depressed, the controller fully closes the throttle valve and reduces the engine output to the minimum. In the low-speed running mode, the speed is controlled by pressing the brake pedal 6 (step 56S7). That is, the brake pedal depression amount sensor 12 detects the amount of depression of the brake pedal, and the controller 1 uses the detected value.
1, the throttle actuator 2 adjusts the opening degree of the throttle valve in step S8 to adjust the engine output. In addition, the vehicle speed can be controlled by mechanically applying the brakes by pressing the brake pedal. In this mode, vehicle speed at low speeds can be controlled using only the brake pedal. Further, when the slippage sensor 14 detects slippage of the running wheels in step S9, the controller closes the throttle valve with the throttle actuator 2 in step S10,
Controls the transmission of driving force to the road by reducing engine output and drive torque.

〔Effect of the invention〕

As explained above, according to the present invention, by being equipped with a brake pedal depression amount sensor, it is possible to control the vehicle speed with only the brake pedal at low vehicle speeds, and when driving at a constant speed at high speeds and when wheels slip. This makes it a simple and inexpensive device that can control vehicle speed from low to high speeds and achieve high performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a traveling-side jB device according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the invention in detail, FIG. 3 is a block diagram of a conventional traveling control device, and FIG. 4 is a block diagram of a conventional traveling control device. The figure is a flowchart diagram for explaining the conventional operation. DESCRIPTION OF SYMBOLS 1... Engine, 2... Throttle actuator, 4... Vehicle speed setting means, 10... Vehicle speed sensor, 12
...Brake depression amount sensor, 14...Slip detection sensor. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A vehicle speed sensor that detects vehicle speed, a slip detection means that detects wheel slip, a throttle actuator that controls engine output, an automatic travel setting means, and a brake depression amount sensor that detects the amount of depression of the brake, When automatic travel is set by the automatic travel setting means when the vehicle speed is a first predetermined vehicle speed or higher, the vehicle is controlled to travel at the set speed, and when the vehicle speed is equal to or lower than a second predetermined speed, automatic travel is set. A travel control device characterized by controlling the vehicle to sometimes travel at a speed depending on the amount of depression of the brake, and to reduce the output of the engine when wheel slip is detected.