JPH0256251B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a constant speed traveling device for a motor vehicle.

By memorizing the vehicle speed at which the vehicle was operating the set switch and automatically adjusting the throttle valve opening by comparing subsequent changes in vehicle speed with the memorized vehicle speed (maintenance vehicle speed), the driver A constant-speed traveling device is well known that maintains the traveling vehicle speed at a desired value, that is, the maintained vehicle speed in the above case, even without pressing the accelerator pedal. Such constant speed driving devices usually have a function to stop constant speed driving control under predetermined conditions, such as when the brake pedal, clutch pedal, accelerator pedal, etc. A function (resume function) for resuming constant speed driving control at the original maintained vehicle speed is provided.

The constant speed traveling device having the above-mentioned functions is further provided with a speed increase function that can continuously increase the maintained vehicle speed according to the switch operation time, and the speed increase operation switch is provided in order to reduce the number of switches. If you try to use it as the above-mentioned resume switch, the following inconvenience will occur. That is, if the resume switch is operated to restart the constant speed cruise control while the constant speed cruise control is stopped, the vehicle speed will be increased and the maintained vehicle speed cannot be returned to the state before the constant speed cruise control was stopped.

The present invention aims to solve the above-mentioned problems in the prior art. According to the present invention, it is possible to obtain a constant speed traveling device having a resume function and a continuous speed increasing function, which can operate both functions reliably and without error using one operating switch.

The features of the present invention that achieve the above-mentioned object include means for detecting a vehicle speed and generating a signal representing the detected vehicle speed, and means for comparing the magnitude of the vehicle speed signal with a signal representing a set maintenance vehicle speed. means for biasing the throttle valve in the opening or closing direction according to the output of the comparison means to control the vehicle speed so that it matches the maintained vehicle speed; and means for stopping the vehicle speed control described above under predetermined conditions; An instruction switch that has a speed increase switch function that increases the maintained vehicle speed when operated during vehicle speed control, and a resume switch function that resumes vehicle speed control when operated while vehicle speed control is stopped; means for restarting vehicle speed control without changing the maintained vehicle speed when an instruction switch is operated; and means for urging the throttle valve in the opening direction when the instruction switch is operated during vehicle speed control. and means for increasing the vehicle speed and setting the increased vehicle speed as a maintained vehicle speed.

The present invention will be explained in detail below using the drawings.

The figure is a block diagram of one embodiment of the present invention. In the figure, 10 is a reed switch for detecting the speed of an automobile, and 12 is a permanent magnet that is rotationally driven by a speedometer cable. The reed switch 10 performs on/off operations as the permanent magnet 12 rotates, thus generating a pulse signal having a frequency proportional to the vehicle speed. This pulse signal is converted into a frequency-voltage conversion circuit (F/V
In the conversion circuit 14, the voltage is converted into a DC voltage having a level proportional to the vehicle speed. The output voltage of the F/V conversion circuit 14 is sent to the storage circuit 18 when the analog switch 16 is on, and the value immediately before the analog switch 16 is turned off is held in the storage circuit 18 as a set voltage corresponding to the maintained vehicle speed. be done. This memory circuit 18 is usually constituted by a capacitor, and the set voltage held in this capacitor is compared in a comparator circuit 20 with the output voltage of the F/V conversion circuit 14, that is, the vehicle speed corresponding voltage corresponding to the traveling vehicle speed. Ru. This comparison result is ORGATE 2
2, the control valve 28a of the actuator 28 is driven by being sent to the actuator 28 via the AND gate 24 and the drive circuit 26.

The comparator circuit 20 has a duty ratio of "1", which is controlled such that when the vehicle speed corresponding voltage is higher than the set voltage, the energization time to the control valve 28a is shortened, and in the opposite case, the energization time is longer. Generates a pulse-like output of “0”. The output of the AND gate 29 is applied to the OR gate 22 in addition to the output of the comparison circuit 20 . The output of the volume switch 30 is applied to the AND gate 29 after being inverted by the inverter 32, and the output of the self-holding circuit 34 is also applied to the AND gate 29. This resume switch 30 is provided as an instruction switch that also has the function of a speed increase switch that continuously increases the maintained vehicle speed according to the operation time, and when it is operated (pressed), it sets the logic "0". ”, and when released, it generates a logic “1” output. Therefore, only when the resume switch 30 is operated and the output of the self-holding circuit 34 is at the logic "1" level, a logic "1" output is sent to the OR gate 22.

AND gate 24 is opened only while the output of self-holding circuit 34 is at logic "1" level, and transmits the output from OR gate 22 to drive circuit 26.

The actuator 28 includes a control valve 28a and a release valve 28b. The control valve 28a is connected to the OR gate 2 via the drive circuit 26 and the AND gate 24.
The opening/closing is controlled by the output of 2. That is, when energized, the atmospheric pressure from the port 28c is cut off, and the intake pipe negative pressure from the port 28d is introduced into the chamber 28e.
When the current supply is cut off, the negative pressure from the port 28d is suddenly cut off, and atmospheric pressure from the port 28c is introduced into the chamber 28e. The release valve 28b is controlled to open and close by the output of the self-holding circuit 34 via the drive circuit 36. That is, when energized, the atmospheric pressure from the port 28f is cut off, and when the energization is cut off, this atmospheric pressure is transferred to the chamber 28f.
e. As mentioned above, by controlling the pressure within the chamber 28e, the diaphragm 28g moves, which causes the rod 28h connected to the accelerator link (not shown) to move in its axial direction, resulting in the throttle valve being moved. The opening degree is controlled.

The set switch 38 is the resume switch 3.
Logic “0” when operated in the same way as 0, that is, pressed
generates a level output and becomes logic “1” when released.
generates a level of output. The output of the set switch 38 is applied to OR gates 41 and 42 via an inverter 40. The output of the AND gate 29 mentioned above is also applied to the OR gate 41, and the output is applied to the analog switch 16. The OR gate 42 includes a one-shot circuit 43.
The output of is also applied to the self-holding circuit 34. Therefore analog switch 1
6 turns on when the set switch 38 is operated or the output of the AND gate 29 becomes logic "1", and turns off when the operation of the set switch 38 is completed and the output of the AND gate 29 becomes "0". . The self-holding circuit 34 is the set switch 3
8 is operated or one shot circuit 4
It is set when 3 is activated.

The one shot circuit 43 is of a positive edge trigger type and is connected to receive the output of the resume switch 30 via two inverters 32 and 33. Therefore, this one-shot circuit 43 operates only when the output of the resume switch 30 is inverted from logic "0" to "1", in other words, only when the operation of the resume switch 30 is completed, and the self-holding circuit 34 Set.

The self-holding circuit 34 is composed of, for example, a flip-flop, and self-maintains that the set operation has been performed by operating the set switch 38 or terminating the operation of the resume switch 30, and during this time, the release valve 28b is attached. a stop lamp switch 44 that is turned on when the brake pedal is pressed, a parking brake switch 46 that is turned on when the parking brake is activated;
It is reset when either the clutch switch or the neutral start switch 48, which is turned on when the clutch is depressed or when the shift position of the automatic transmission becomes neutral, is turned on, and the release valve 28b is turned off. Force,
It also has a function of closing the AND gates 24 and 29.

Next, the operation of this embodiment will be explained. When the set switch 38 is pressed (operated), the self-holding circuit 34
is set, the release valve 28b is energized, and the atmosphere introduction port 28f is closed. At the same time, the analog switch 16 is turned on, and a voltage corresponding to the vehicle speed is applied to the memory circuit 18. When the set switch 38 is released, the analog switch 16 is turned off, and the voltage corresponding to the vehicle speed immediately before the analog switch 16 is turned off is stored in the storage circuit 18 as the set voltage. Since the self-holding circuit 34 is set and the AND gate 24 is opened, the control valve 28a of the actuator 28 is thereafter set to the comparison circuit 20.
As a result, the opening degree of the throttle valve is automatically controlled so that the traveling vehicle speed becomes equal to the maintained vehicle speed, thereby achieving constant speed traveling control.

When the resume switch 30 is pressed while constant speed driving control is being carried out, the AND gate 29 is open because the self-holding circuit 34 is set in this case, and therefore the analog switch 16 is
is turned on, a voltage corresponding to the vehicle speed is applied to the memory circuit 18, and at the same time, an output of logic "1" is applied to the drive circuit 26 via the OR gate 22. Therefore, the control valve 28a remains energized while the resume switch 30 is pressed, and the rod 28h of the actuator 28 moves in the direction of the arrow 50, driving the throttle valve in the opening direction, and the vehicle speed is continuously increased. Forced to speed up. resume switch 3
When you release 0, analog switch 16 turns off,
The voltage corresponding to the vehicle speed immediately before the switch is turned off is stored in the storage circuit 18 as a set voltage, and thereafter, constant vehicle speed control is performed using this set voltage.

If the resume switch 30 is pressed while the constant speed running control is stopped, in this case the self-holding circuit 34 has been reset, the AND gate 29 is closed, and the analog switch 16 is closed.
is off, the stored set voltage is not updated, and the control valve 28a via the OR gate 22
is not energized, and the control valve 28a and release valve 28
b remains deenergized. When the resume switch 30 is released, the input to the one-shot circuit 43 rises, so this is activated, the self-holding circuit 34 is set, and the constant speed running control is resumed. Moreover, in this case, the memory circuit 1
Since the contents of 8 are not updated, control is performed again at the maintained vehicle speed immediately before the constant speed cruise control was stopped.

As described in detail above, according to the present invention, there is provided means for restarting vehicle speed control without changing the maintained vehicle speed when the resume switch is operated while vehicle speed control is stopped; When the switch is operated, the throttle valve is continuously biased in the opening direction during the operation, and the vehicle speed at the end of the operation is set as the maintained vehicle speed. That is, the resume function and the continuous speed increase function can be operated reliably and without error by the resume switch. Therefore, the number of operation switches can be reduced, and great convenience can be obtained in terms of cost reduction and ease of operation.

[Brief explanation of the drawing]

The figure is a block diagram of one embodiment of the present invention. 10...Reed switch, 12...Permanent magnet, 14
...F/V conversion circuit, 16...Analog switch, 1
8... Memory circuit, 20... Comparison circuit, 22, 41, 4
2...or gate, 24, 29...and gate, 2
6, 36... Drive circuit, 28... Actuator, 2
8a...Control valve, 28b...Release valve, 30...Resume switch, 34...Self-holding circuit, 38...Set switch, 43...One shot circuit.

Claims (1)

[Claims] 1. Means for detecting vehicle speed and generating a signal representing the detected vehicle speed; means for comparing the magnitude of the vehicle speed signal with a signal representing a set maintenance vehicle speed; and means for operating a throttle valve in accordance with the output of the comparing means. means for biasing the vehicle speed in the opening or closing direction to control the vehicle speed to match the maintained vehicle speed; means for stopping the vehicle speed control described above under predetermined conditions; and means for controlling the vehicle speed to be maintained when operated during vehicle speed control. An instruction switch that has both an increase switch function to increase the speed and a resume function that resumes vehicle speed control when operated while the vehicle speed control is stopped, and if the instruction switch is operated while the vehicle speed control is stopped, A means for restarting vehicle speed control without changing the maintained vehicle speed, and a means for increasing the vehicle speed by biasing the throttle valve in the opening direction when the instruction switch is operated during vehicle speed control. 1. A constant speed traveling device comprising means for setting a vehicle speed as a maintenance vehicle speed.