JPS5922964B2 - cruise control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cruise control device that maintains the running speed of an automobile constant, and in particular, is capable of performing speed governor control to correct the distance between the vehicle and the vehicle in front during cruise control driving. This relates to a cruise control device that enables

Generally, when a cruise control device is set to a desired speed while driving a car, it automatically controls the speed so that the speed remains constant without having to press the accelerator pedal. It memorizes the vehicle's running speed, and then compares the memorized vehicle speed with the actual vehicle speed. If the actual vehicle speed is faster, the throttle valve is closed slightly, and if the actual vehicle speed is slower, the throttle valve is opened. This automatically controls the head knottle mechanism. If you set this cruise control device at an appropriate speed when driving continuously for a long time on a highway, you can maintain an appropriate distance from the vehicle in front for a considerable period of time. Since the device is not designed to adjust the distance between vehicles, the distance between the vehicle and the vehicle in front will gradually become inappropriate, and in this case, it is necessary to immediately return the distance to the optimal distance.

In this case, some conventional cruise control devices use a one-way clutch to enable acceleration and overtaking by stepping on the accelerator, but they require a special latch device, and conversely, when decelerating, The cruise control device must be deactivated,
There is a problem that the operation is complicated and lacks speed. The present invention was made in consideration of these points, and the present invention rapidly corrects the following distance by accelerating or decelerating at an arbitrary speed according to the distance between the vehicle in front and the vehicle in front while the cruise control device is in the operating state. The present invention provides a cruise control device with an electronic control circuit configuration that can perform the following steps.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The figure shows a cruise control device according to the present invention, in which a vehicle speed sensor 1 detects the traveling speed of a car, is set when the cruise switch SW is turned on (reset when it is turned off), and the vehicle speed sensor 1 detects the current speed of the vehicle. A first sample-and-hold circuit 2 for storing speed, an adder 3 for producing an output c according to the deviation between the output a of this sample-and-hold circuit 2 and the output of the vehicle speed sensor 1, and an optimum response adjustment based on a change in target value. PID controller 4 to perform and this PID controller 4
The main control section A of the cruise control consists of an output device 5 that adjusts the opening degree of the throttle valve of the throttle mechanism 6 according to the output of the LD regulator 4, and a main control section A of the cruise control consisting of an output device 5 that adjusts the opening degree of the throttle valve of the throttle mechanism 6 according to the output of the LD regulator 4, and a main control section A of the cruise control that is manually controlled to the right (acceleration direction) or left (deceleration direction). A speed control shaft 7 that can give instructions for acceleration or deceleration by turning the speed control shaft 7, a digital pickup 8 that detects the amount and direction of rotation of the speed control shaft 7, set by turning on the cruise switch SW (reset by turning it off) ), a reversible digital counter 9 that digitally performs a counting operation in the positive or negative direction according to the output of the digital pickup 8 to generate an acceleration or deceleration signal, and a reversible digital counter 9 that converts the digital output of this counter 9 into an analog signal. -A converter 10
, a second sample-and-hold circuit 13 that holds a signal obtained by differentiating the output d of this D-A converter 10 by a differential capacitor 11 for a preset time by a timer 12 consisting of a resistor and a capacitor; an adder 15 that adds the signal e obtained by amplifying the output of the circuit 13 via the amplifier 14 and the output d of the D-A converter 10; a second adder 16 that adds the output c of the adder 3;
The cruise control speed governor control section B consists of a cruise control speed regulating control section B.

The operation of the cruise control device according to the present invention configured as described above will be explained below.

First, during normal cruise control, when the driver turns on the cruise switch SW when the desired vehicle speed is reached, the sample hold circuit 2 of the main control section A is set, and the vehicle speed sensor 1 is set at that point. The vehicle speed detected by the sample and hold circuit 2 is stored in the sample and hold circuit 2. When this cruise switch SW is turned on, adder 3
The two inputs A and b are equal and the output c is zero, and the output device 5 controls the throttle mechanism 6 to maintain the vehicle speed.
The opening of the throttle valve is held constant. Thereafter, the actual vehicle speed changes due to changes in road conditions, for example, if it becomes faster than the set speed, b>a, and the negative output C of the adder 3 corresponding to the difference is sent to the output device 5. The output device 5 drives the throttle mechanism 6 in the direction of deceleration until the actual vehicle speed becomes equal to the set speed. On the contrary, when b<a, the throttle mechanism 6 is driven in the direction of acceleration by a positive output c corresponding to the difference. Next, when driving under cruise control, when the distance between the vehicle and the vehicle in front becomes inappropriate and it is necessary to perform speed regulation, the speed regulating shaft 7 can be turned to the right or left as appropriate according to the driver's judgment. and counter 9 depending on the direction
performs digital counting operation in the positive or negative direction (cruise switch SW is already in the on state), and D-
A positive or negative regulating signal d is obtained via the A converter 10.

This speed regulating signal d is differentiated by a differential capacitor 11, and the differentiated signal is held in a sample hold circuit 13 for a preset time (several seconds) by a timer 12, during which time the differential signal is A signal f obtained by adding the differential and amplification signal e to the speed control signal d is applied to the output side of the adder 3 of the main control section A via the adder 16. In this case, when the regulating shaft 7 is turned to the right, the signal f has a positive sign and is added to the output c of the adder 3, and the output device 5 drives the throttle mechanism 6 in the acceleration direction accordingly. When the regulating shaft 7 is turned to the left, the signal f becomes a negative sign and is subtracted from the output c of the adder 3, and the throttle mechanism 6 is driven in the deceleration direction accordingly.
Furthermore, after the set time of the timer 12 has elapsed, the sample hold circuit 13 of the speed governor control section B is reset and its output becomes zero, and only the speed governor signal d corresponding to the rotation of the speed governor shaft 7 is sent to the adder 16. Therefore, speed governing control is performed over a smaller range than before. When the inter-vehicle distance becomes appropriate through this speed control operation, the speed control shaft 7 can be returned to its original position (it will automatically return to its original position when you release your hand). The output of speed control section B becomes zero, and cruise control by main control section A is continued again.
As described above, in the cruise control device according to the present invention, speed control control in the direction of acceleration or deceleration is performed during cruise control driving, and at the time of speed control, speed control is temporarily performed in accordance with the speed control instruction. This makes it possible to easily and quickly change the inter-vehicle distance during cruise control driving.

As described above, in the cruise control device according to the present invention, the vehicle speed when the cruise switch is turned on is stored in the first sample hold circuit, and the throttle is adjusted according to the control deviation between the stored vehicle speed and the actual vehicle speed. The main control circuit that adjusts the opening of the valve can be given an instruction to increase or decrease the speed by rotating the speed control shaft, and a second sample hold circuit equipped with a timer can give speed control instructions for a certain period of time by rotating the speed control shaft. This device incorporates a speed governor control circuit that can give instructions to turn around the speed, and instead of installing a special tarpaulin mechanism like in the past, you can simply install the electronic control circuit while maintaining the general automobile structure. It has the excellent advantage of being able to easily control acceleration and deceleration directions with excellent responsiveness during cruise control driving.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a block diagram of a cruise control device according to an embodiment of the present invention. A: Main control section, B: Governor control section,
SW...Cruise switch, 1...Vehicle speed sensor, 2...Sample hold circuit, 3.
... Adder, 4 ... PID controller, 5.
...Output device, 6...Throttle mechanism,
7... Speed control shaft, 8... Digital pickup, 9... Reversible digital counter, 10... D-A converter, 11...
... Differential capacitor, 12 ... Timer, 1
3...Sample hold circuit, 15...
・Adder, 16...Adder.

Claims (1)

[Claims] 1. A cruise control device that stores the vehicle speed when the cruise switch is turned on in a first storage device, and adjusts the opening of the throttle valve according to the control deviation between the stored vehicle speed and the actual vehicle speed, Generates a speed control signal in the acceleration and decrement directions according to the rotation of the speed control shaft, and adds the output of a second storage device that stores the differential value of the speed control signal during the time set by the timer to the speed control signal. , and a speed governor control device that adds the added signal to the control deviation.