JPH0443821B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a vehicle equipped with an automatic constant speed driving device that can smoothly run at a constant speed when resuming during automatic constant speed control, regardless of the size of the cargo. The present invention relates to an automatic constant speed cruise control device that can perform control.

(Prior Art) In order to drive a vehicle at a set constant speed, a vehicle is equipped with an automatic constant speed driving device that performs constant speed driving control using an electronic control device according to a program stored in a storage device. A vehicle speed control device has been proposed (Japanese Patent Application Laid-Open No. 101241/1983) that controls the vehicle speed in accordance with the load of the vehicle.

(Problem to be Solved by the Invention) During the above-mentioned automatic constant speed driving (auto cruise) control, when auto cruise is temporarily canceled by, for example, stepping on the brake, by pressing the resume switch, the set vehicle speed before cancellation is The vehicle returns to auto cruise mode.

However, the acceleration state of the vehicle when resuming differs depending on the load on the vehicle. For example, if the resume function is adjusted when the vehicle is empty, the acceleration when resuming when the vehicle is loaded will be unsatisfactory, and When adjusting the resume function, the result is sudden acceleration when the vehicle is resumed when the vehicle is empty, resulting in dangerous acceleration. In addition, there is a possibility that the stability of the vehicle speed may vary depending on the load capacity of the vehicle.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional problems and to provide a vehicle equipped with an automatic constant speed driving device that can smoothly accelerate when resuming during automatic constant speed control, regardless of the size of the payload. An object of the present invention is to provide an automatic constant-speed traveling device that returns to constant-speed traveling.

(Means for solving the problem) In order to achieve the above purpose, an automatic constant speed traveling device equipped with a resume function that controls automatic constant speed traveling using an electronic control device is provided with a means for determining the load status. There is provided an automatic constant speed traveling device that detects the operation of the load status determining means during the resume operation and controls the fuel flow rate according to the load.

(Function) The vehicle is equipped with a loading switch, and the loading switch is set when the loading capacity exceeds a predetermined value, so the state of the loading truck switch is detected at the time of resuming, and the fuel flow rate is controlled according to the loading capacity. Appropriate acceleration can be obtained, and smooth constant speed driving control is possible.

(Example) Examples of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a configuration block diagram showing an embodiment of the present invention, and FIG. 2 is a processing flow diagram showing the operation of the automatic constant speed traveling device of the present invention.

In Fig. 1, 1 is a gasoline engine, 1a
is its throttle actuator, and 1b is its throttle valve. 2 is a clutch, and 3 is a clutch actuator for operating the clutch, which includes a clutch drive device 4 and a clutch control device 5. 6 is a parallel shaft gear type transmission, and 7 is a transmission actuator that changes the gear ratio of the transmission 6. 8 is an engine rotation sensor, and 9 is a wheel drive mechanism, which includes a propeller shaft, a universal joint, and the like. 10 is a wheel drive mechanism 9
This is a vehicle speed sensor installed inside the vehicle. Reference numeral 11 indicates a control lever for operating the drive, which switches the position switch 12.
The signal emitted from 2 is sent to electronic control unit 13. Then, based on this signal, the electronic control device 13
A signal according to the position of the control lever 11 is given to the transmission actuator 7, and the transmission actuator 7 changes the gear ratio of the transmission 6 in accordance with the signal. 14 is an accelerator pedal, 15 is a throttle control device, and 16 is an accelerator sensor that detects the amount of depression of the accelerator pedal 14. This throttle control device 15 has a drive section 15a that drives the throttle valve 1b and a control section 15b that controls it, and an accelerator sensor 16.
The opening degree of the throttle valve 1b is controlled according to the depression position of the accelerator pedal 14 based on the signal from the throttle valve 1b.

The electronic control unit 13 composed of a microcomputer is a processor (CPU) that performs arithmetic processing.
13a, a read-only memory (ROM) 13b that stores programs for controlling the transmission 6 and clutch 2, programs for automatic constant speed driving control (constant speed control) described later, and a random access memory that stores calculation results. (RAM) 13c, an input/output port 13d, and an address/data bus (BUS) 13e that connects them.

A brake pedal 17 is provided with a brake sensor 17a that detects the amount of depression of the brake pedal, and its signal is sent to the electronic control unit 13.

20 is a main switch that supplies power to a system that controls the vehicle at a constant speed, and when the main switch is turned on, the constant speed control system (system) is activated.
starts operating. 21 is a set switch that sets the vehicle speed obtained by depressing the accelerator pedal 14 to constant speed control while the above system is in operation; by pressing the set switch 21 at the desired vehicle speed, the system is set to the desired vehicle speed. . Also, if you keep pressing the set switch 21,
The constant speed control is temporarily canceled, the engine 1 is placed in an idling state, the engine brake is applied to decelerate the vehicle, and when the set switch 21 is stopped being pressed, the system is set to the vehicle speed at that time. 22
is a resume switch that, when pressed, returns the system to a constant speed control state, and the vehicle speed is controlled to the set speed before the temporary release. When the resume switch 22 is continued to be pressed, the vehicle is accelerated to a high speed, and the system is set to the vehicle speed at the time when the resume switch 22 is stopped being pressed.

Reference numeral 18 denotes a loading vehicle switch serving as a loading status determining means, and the loading vehicle switch 18 is turned on when the vehicle's cargo is greater than a predetermined loading amount. Then, by operating it to the ON side, a signal to this effect is input to the electronic control unit 13.

In addition to these signals, the electronic control device 13 also has an engine rotation sensor 8, a vehicle speed sensor 10, and a position switch 1 for the control lever 11.
2. Signals from the brake sensor 17a, the main switch 20, the set switch 21, the resume switch 22, etc. of the constant speed control system are input, and control signals are sent to the transmission actuator 7 and the throttle control device 15 as outputs. It is configured.

Next, the operation of the present embodiment having the configuration shown in FIG. 1 will be explained with reference to the processing flow diagram shown in FIG. 2.

In the figure, when the vehicle is running, main switch 2 is
If 0 is pressed and constant speed control is in progress, vehicle speed sensor 1
The vehicle speed is read into the electronic control unit 13 by the signal from 0 (S1). Next, when the set switch 21 is pressed and turned ON, the vehicle speed at that time is read as the set vehicle speed (S2), and the speed of the traveling vehicle is controlled at the set vehicle speed. Then, the electronic control unit 13 calculates a vehicle speed difference ΔV between the traveling vehicle speed, which changes depending on the road condition, and the read vehicle speed (S3).

In S4, a check is made to see if the constant speed control has been temporarily canceled, for example, by depressing the brake pedal 17. If the constant speed control has not been temporarily canceled, the process proceeds to S9.
Further, if the constant speed control is temporarily canceled in S4 and the resume switch is pressed, the constant speed control is restored and the process proceeds from S6 to S7. In addition, if the constant speed control is canceled without pressing the resume switch 22 in S6, the fuel supply to the engine 1 is the flow rate at idling, so the engine 1 becomes idling rotation and the vehicle is decelerated by the engine brake. (S8)

Next, the resume switch is pressed at S6,
In S7, the opening/closing status of the loading vehicle switch 18 is checked and when it is detected that it is OFF, it is determined that the loading of the vehicle is less than a predetermined amount, and the process proceeds to S9.

In S9, the proportionality constant KP used to calculate the fuel flow rate
and the integral constant KI, respectively, are given as they are.
Using the values of KP and KI, proceed to the next step S10.

In addition, when it is determined that the loading vehicle switch 18 is ON in S7, the process proceeds to S5, and since it is determined that the loading amount of the vehicle is greater than the predetermined amount, the proportionality constant KP for calculating the fuel flow rate is
αKP, which is increased by multiplying by α (coefficient), and βKI, which is obtained by multiplying integral constant KI by β (coefficient), are set as KP and KI, respectively, and the process proceeds to S10.

Then, at S10, the CPU 13 of the electronic control unit 13
A calculates the flow rate using the fuel flow rate calculation formula Q=A+KPΔV+∫KIΔVdt, and the input/output port 13d issues a fuel flow rate command to the throttle control device 15 to inject fuel into the engine 1.

Therefore, when resuming, the loader switch 18
When is ON, α and β are multiplied by constants, resulting in an increased fuel flow rate. Also, the loading truck switch
When the vehicle is off, the fuel flow rate is the same as when driving at a constant speed, so appropriate acceleration is obtained depending on the load and the vehicle returns to constant speed driving.

In addition, in the above calculation formula, A is the amount of change in vehicle speed ΔV
It is a constant that is unrelated to the vehicle speed and has a value that corresponds to the amount of fuel consumed according to the set vehicle speed.

As mentioned above, the present invention has been explained using one embodiment, but various modifications can be made within the scope of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As explained in detail above, the present invention provides an automatic constant speed traveling device equipped with a resume function that performs constant speed control using an electronic control device, which includes a loading truck switch serving as a means for determining the loading status. By checking the operation of the loading vehicle switch, which is the load status determination means, during the resume operation, the fuel injection amount is controlled to provide acceleration according to the size of the loaded amount, so appropriate acceleration can be obtained according to the loaded amount. , driving safety is improved.

[Brief explanation of drawings]

FIG. 1 is a structural block diagram showing an embodiment of an automatic constant speed traveling device according to the present invention, and FIG. 2 is a processing flow diagram showing an example of the processing of the embodiment shown in FIG. 13...Electronic control device, 15...Throttle control device, 18...Locking vehicle switch, 20...Main switch, 21...Set switch, 22...Regium switch.

Claims (1)

[Claims] 1. In an automatic constant-speed traveling device equipped with a resume function that controls automatic constant-speed traveling using an electronic control device, a load condition determining means is provided, and when the resume function is activated, the operation of the load condition determining means is detected and the vehicle is An automatic constant speed traveling device characterized by controlling the fuel flow rate to obtain acceleration according to the amount of cargo loaded.