JPH02200536A - Car speed automatic control device - Google Patents

Abstract

PURPOSE:To improve safety by cutting off the excitation of a driving motor in the throttle valve opening direction via the depressing operation of a brake when the car speed automatic control is released by the depressing operation of the brake. CONSTITUTION:When the cruise signal is inputted from a command switch 2, a car speed automatic control means 7 controls the opening and closing of a throttle valve 5 via a drive control means 6, a driving motor 4a, and an electromagnetic clutch 4b in response to the deviation between the car speed signal from a car speed sensor 1 and the preset car speed stored in a memory means 3 and turns the motor 4a off with a limit switch 4c at full closure or full open positions. When the car speed automatic control is released by the depressing operation of a brake 8, the cutoff means 4d of an actuator 4 outs off the excitation of the driving motor 4a in the throttle opening direction via this depression. Even if any abnormality occurs on a control means or a driving means when the car speed automatic control is released, the opening action of the throttle valve is prevented, and safety can be secured.

Description

[Detailed description of the invention] [Purpose of the invention]

(Industrial Application Field) The present invention relates to a vehicle speed tick control device used to automatically control the traveling speed of a vehicle to a certain set speed. (Prior Art) The above-mentioned automatic vehicle speed control devices have conventionally had various configurations, but some of them include a vehicle speed sensor that outputs vehicle speed data proportional to the actual vehicle speed, and a vehicle speed sensor that outputs a cruise command signal. a command switch that stores vehicle speed data from the vehicle speed sensor when the command switch is operated; an actuator that drives the throttle valve by rotation of a drive motor via an electromagnetic clutch; and a drive motor for the actuator. There has been an automatic vehicle speed control device that includes a drive circuit that rotates the vehicle in forward and reverse directions, and control means that sends commands to the drive circuit in response to the difference between the actual vehicle speed and the stored vehicle speed. The actuator is provided with respective limit switches for detecting the fully open state and fully closed state of the valve at respective positions of the output mechanism corresponding to the fully open position and the fully open position of the throttle valve, and when the throttle valve is in the fully open position or the fully open position. When this state is reached, the limit switch detects this state and cuts off the power to the drive motor. In the automatic vehicle speed control device, the set switch among the command switches is turned on and then turned off.
By setting M, the vehicle speed at the time of the OFF operation is stored, and in response to the difference between the stored vehicle speed and the actual vehicle speed, the control means operates the drive circuit and energizes the electromagnetic clutch of the actuator to drive the actuator. The throttle valve is opened and closed via the ML magnetic clutch by the rotation of the motor, and the actual vehicle speed is adjusted to the memorized vehicle speed to perform constant speed driving.Also, during the constant speed driving, the brake pedal is not depressed. When this is done, a cancel signal generated by depressing the brake pedal is input to the control means to cancel the vehicle speed control state, and the drive circuit stops and slows the rotation of the actuator drive motor in response to the release command from the control means. At the same time, the system is canceled by putting the actuator in the ``FL magnetic clutch energized state.'' (Problem to be Solved by the Invention) However, in the conventional vehicle speed automatic control device described above, when automatically controlling the vehicle speed, the control means or If some abnormality occurs in the drive circuit and the drive motor is rotated in the throttle valve opening direction, even if the electromagnetic clutch is de-energized by depressing the brake pedal,
The drive motor continues to rotate, and especially if some abnormality occurs in the control means and the electromagnetic clutch cannot be de-energized by depressing the brake pedal, the throttle valve is driven in the valve opening direction to reduce the vehicle speed. However, there was a problem in that the dynamic control could not be canceled. (Purpose of the Invention) Accordingly, the present invention is capable of reliably stopping the rotation of the drive motor by depressing the brake even if some abnormality occurs in the control means or the drive means during automatic vehicle speed control. The purpose of this invention is to provide a vehicle speed fluctuation control device.

[Structure of the invention]

(Means for Solving the Problems) The basic configuration of the automatic vehicle speed control device according to the present invention will be explained using the functional block diagram shown in FIG. , a command switch 2 that outputs a cruise command signal, a vehicle speed storage means 3 that stores vehicle speed data from the vehicle speed sensor 1 when the command switch 2 is operated, and a drive motor 4a. clutch 4
A motor drive motor that is provided with a limit switch 4C that drives the throttle valve 5 through a switch b and detects whether the throttle valve 5 is fully open or fully closed, and that stops the drive motor 4a when the limit switch 4C is detected. A drive means 6 for rotating the drive motor 4a of the actuator 4 in forward and reverse directions, and a control means 7 for sending commands to the drive means 6 in response to the difference between the actual vehicle speed and the stored vehicle speed. In the automatic vehicle speed control device, the actuator 4 is provided with a cutoff function that cuts off the power supply to the drive motor 4a in the throttle valve opening direction when the brake 8 is depressed to release the vehicle speed control. The present invention is characterized by having a configuration in which a means 4d is provided, and this configuration is used as a means for solving the conventional problems. (Function) The automatic vehicle speed control device according to the present invention has the above-described configuration, and as shown in FIG. 1, when the automatic vehicle speed control is canceled, the actuator 4 is
A cutoff means 4d cuts off the power supply to the drive motor 4a in the throttle valve opening direction. Therefore, the control means 7
Or, even if some abnormality occurs in the drive means 6 and the drive motor 4a of the actuator 4 rotates so as to drive the throttle valve 5 in the opening direction regardless of the driver's will, the drive motor 4a is driven by pressing the brake 8. The rotation of the motor 4a is stopped. (Example) Hereinafter, the present invention will be explained based on the drawings. FIG. 2 is a diagram showing an embodiment of the automatic vehicle speed control device according to the present invention, and FIG. 2 is a diagram showing the circuit configuration of the automatic vehicle speed control device. In FIG. 2, 11 is an automatic vehicle speed control device. This automatic vehicle speed control device 11 includes a vehicle speed sensor 12 (corresponding to the vehicle speed sensor 1 shown in FIG. 1) that outputs vehicle speed data proportional to the actual vehicle speed in the form of a pulse signal, and a command switch 13 (corresponding to the vehicle speed sensor 1 shown in FIG. 1) that outputs a cruise command signal. (corresponding to the command switch 2 shown in Fig. 1) and the vehicle throttle valve 14 (corresponding to the command switch 2 shown in Fig.
Depressing a motor-driven actuator 15 (corresponding to the actuator 4 shown in FIG. 1) that drives the throttle valve 5 (corresponding to the throttle valve 5 shown in FIG. 1) and a brake pedal (not shown) (corresponding to the brake 8 shown in FIG. 1) In the controller 20, the controller 20 is provided with a play kiss inch 16 that is linked to the operation. m Note i1U speed sensor 12. Command switch 13
and a microcomputer 24 into which each actuation signal of the brake switch 16 is inputted via the respective interface circuits 21, 22, and 23, and the microcomputer 24 controls the drive motor 15a of the actuator 15, which will be described later, in the valve opening direction and in the valve closing direction. drive circuit 25 (first
(corresponding to the driving means 6 shown in the figure), and the microcomputer 24 drives the actuator 15 (described later).
It has a circuit configuration including a starting circuit 26 that engages and engages the clutch 15b, a reset circuit 28, and a constant voltage circuit 29. Note that the automatic vehicle speed control device 11 is operated by a main switch 30.
Car battery 31. A brake rung 32 and a cruise lamp 33 are provided outside the controller 20. Further, the command switch 13 includes a set switch, a resume switch, an accelerator switch, and the like. The actuator 15 includes a drive motor 15a (a first
(corresponding to the drive motor 4a shown in the figure) and the starting circuit 2
6, an electromagnetic clutch 15b (corresponding to the electromagnetic clutch 4b shown in FIG. 1) transmits the rotation of the drive motor 15a to the throttle valve 14 via a deceleration mechanism (not shown).
and a limit switch 15c for detecting a fully open position that detects the fully open state of the throttle valve 14 at the corresponding fully open position in the actuator 15 (corresponding to the limit switch 4c shown in FIG. 1, which is in the OFF state at the fully open position); a fully closed position detection limit switch 15d that detects the fully closed state of the throttle valve 14 at the corresponding fully open position in the actuator 15 (corresponding to the limit switch 4C shown in FIG. 1, and is in the OFF state at the fully closed position); , a diode D1 that passes a motor drive signal in the valve opening direction in the forward direction when the throttle valve 14 is fully closed, and a diode D2 that passes the motor drive signal in the valve closing direction in the forward direction when the throttle valve 14 is fully open. , a relay coil RL1a provided in parallel with the electromagnetic clutch 15 and in series with the limit switch 15c for detecting the fully open position, and a movable contact piece RL1b that short-circuits the diode D2 by attraction of the relay coil RL1a. Cutoff relay RLI that cuts off the motor drive signal in the opening direction
(corresponding to the shutoff means 4d shown in FIG. 1). The actuator 15 and the throttle valve 14 are connected via an output link or the like. The brake switch 16 has a normally closed state. The first switch 16a is provided with a normally open second switch 16b, and when the brake pedal (not shown) is depressed, the first switch 16a opens and outputs a cancel signal to the starting circuit 26. 2 switch 16b is closed, and a cancel signal is input to the microcomputer 24 via the interface circuit 23.
When the F operation is performed, the vehicle speed storage means 3 stores the vehicle speed at the time of the OFF operation (corresponds to the vehicle speed storage means 3 shown in FIG. 1, but it can also be stored in 11 by recording the !1i speed at the time of the ON operation).
Then, in response to the OFF operation of the set switch among the command switches 13, the starting circuit 26 is activated to energize the electromagnetic clutch 15b of the actuator 15, and the vehicle speed stored in the F stage and the stored vehicle speed from the vehicle speed sensor 12 are activated. It has a built-in control means (corresponding to the control means 7 shown in FIG. 1) that compares the actual vehicle speed and operates the drive circuit 25 based on the difference so that the actual vehicle speed matches the stored vehicle speed. The drive circuit 25 includes a PNP type transistor Trl for forward rotation that supplies a current in the forward rotation direction (that is, the pulp opening direction) to the drive motor 15a in the actuator 15.
, a PNP type transistor Tr2 for reverse rotation that supplies a current in the reverse rotation direction (that is, the valve closing direction) to the drive motor 15a in the actuator 15, and a motor positive current output from the control means in the microcomputer 24. A motor forward rotation switching section 25a that operates the transistor Trl in response to a rotation drive signal, and a reverse rotation switching section 25b that operates the transistor Tr2 in response to a motor reverse rotation drive signal output from a control means within the microcomputer 24. , a forward rotation grounding switching unit 25c that grounds the drive motor 15a in the actuator 15 to rotate the drive motor 15a in the forward direction when the transistor Trl is activated; The drive motor 15a is grounded and the drive motor 1
Reverse rotation grounding switching unit 25d that reversely rotates 5a
, resistors R1 and R2 that adjust the input current of the forward rotation switching section 25a, and resistors R3 and R4 that adjust the input current of the reverse rotation switching section 25b, and a microcomputer. The drive motor 15 in the actuator 15 responds to the command of 24.
Perform forward/reverse rotation control of a. The starting circuit 26 includes an excitation switching section 26 that is activated by the output of a control means within the microcomputer 24.
a, a transistor TrlO that conducts the base voltage through the diode 010 and excites the 'Bock latch 15b in the actuator 15 by operating the excitation switching F126a, and the transistor TrlO.
The electromagnetic clutch 15 in the actuator 15 has a circuit configuration including resistors RIO and R11 that divide and adjust the base voltage of the
Perform excitation b. Next, the operation of the vehicle speed tick control device 11 having the above configuration will be explained. First, in order to operate the automatic vehicle speed control device 11, the main switch 30 is turned on. At this time, the vehicle speed sensor 12 outputs a pulse signal that is vehicle speed data proportional to the actual vehicle speed, and this pulse signal is input to the microcomputer 24 in the controller 20 and sampled within a certain period of time. is recognized by the microcomputer 24. In this state, a set signal is input to the control means in the microcomputer 24 by the command switch 13, and when the set signal is released, the cruise lamp 33 is turned on and the vehicle speed at that time is The number of pulses corresponding to is brought into an excited state, and the throttle valve 14 is made openable and closable by the drive motor 15a within the actuator 15. In this state, the control means in the microcomputer 24 also sends a message to the microcomputer 24.
A motor drive signal corresponding to the number of pulses stored in the vehicle speed storage means in 4 is output. Depending on the motor drive signal, the switching section 25a for forward rotation or the switching section 2 for reverse rotation in the drive circuit 25 is activated.
5b to rotate the drive motor 15a in the actuator 15, and 'electromagnetic clutch 15b'
and holds the throttle valve 14 in place via an output link (not shown). After this, even if the accelerator pedal is released, the throttle valve 14 is held at a predetermined position, so that the vehicle can travel at a constant speed. In this automatic vehicle speed control, in order to maintain the set vehicle speed, the control means in the microcomputer 24 controls the number of pulses proportional to the actual vehicle speed of the vehicle speed sensor 12, and the number of pulses is stored in the vehicle speed storage means in the microcomputer 24. The number of pulses (memory vehicle speed) is compared, a motor drive signal corresponding to the difference is output to the drive circuit 25, and the drive circuit 25
The forward rotation switching section 25a or the reverse rotation switching section 25b inside is activated to rotate the drive motor 15a inside the actuator 15 in the slow/torque loop opening direction or the throttle valve closing direction to keep the vehicle speed constant. When the above automatic vehicle speed control is canceled, when the brake pedal is depressed, the first switch 16a of the brake switch 16 that is linked to this operation is turned off (
Normally ON state) and the 1st and 2nd switches 16b are turned OFF.
It becomes N state (normally OFF state). At this time, the second switch 1 of the brake switch 16
A cancel signal is input to the microcomputer 24 via the interface circuit 23 due to the ON state of 6b. Also, in the same poem, the first brake switch 16
In response to the OFF state of the switch 16a, the power supply to the emitter of the transistor TrlO in the starting circuit 26 is stopped, and the relay coil RL1a of the cutoff relay RLI in the actuator 15 becomes de-energized 7 m, and the electromagnetic clutch 15b also becomes de-energized. Therefore, during the above automatic vehicle speed control. If some abnormality occurs in the microcomputer 24 and the drive circuit 25 or 26, and in this state, a failure occurs that causes the drive motor 15a in the actuator 15 to continue rotating in the forward rotation direction (that is, the valve opening direction). In this case, when the brake pedal is depressed, the rotation of the drive motor 15a can be stopped by the brake operation via the cutoff relay RLI in the actuator 15, regardless of the operation of the microcomputer 24. Even if the electromagnetic clutch 15b of the actuator 15 fails, the throttle valve 14 will not be driven in the valve opening direction.

【Effect of the invention】

As described above, the automatic vehicle speed control device according to the present invention includes a vehicle speed sensor that outputs vehicle speed data proportional to the actual vehicle speed, a command switch that outputs a cruise command signal, and a command switch that outputs a cruise command signal when the command switch is operated. A vehicle speed storage means for storing vehicle speed data from a vehicle speed sensor and a drive motor are provided, and the rotation of the drive motor drives a throttle valve via an electromagnetic clutch and detects whether the throttle valve is fully open or fully closed. A motor-driven actuator that is equipped with a switch and that stops the drive motor when the limit switch is detected;
In the automatic vehicle speed control device, the actuator is provided with a drive means for reverse rotation, and a control means for sending a command to the drive means in response to a difference between the speed and a stored vehicle speed. When automatic vehicle speed control is canceled,
By providing a configuration with a cutoff means that cuts off the electricity supply to the drive motor in the throttle valve opening direction when the brake is depressed, when the automatic vehicle speed control is canceled,
Since it is possible to stop the rotation of the actuator drive motor by stepping on the brake, if some abnormality occurs in the control means or drive means, the actuator drive motor will open the throttle valve regardless of the driver's will. Even when the throttle valve is driven in the opening direction, an excellent effect can be obtained in that it is possible to prevent the throttle valve from being driven in the opening direction by the brake pedal operation.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing a configuration of an embodiment of an automatic vehicle speed control device according to the present invention, and FIG. 2 is an explanatory diagram showing a circuit configuration of an embodiment of the automatic vehicle speed control device according to the present invention. 1.12... Vehicle speed sensor 2.13... Command switch, 3.24... Vehicle speed storage means, 4.15... Actuator, 4a, 15a... Drive motor 4b, 15b... Electromagnetic clutch, 4c, 15c, 15d...Limit switch, 4d
, RLI... Cutoff means, 5.14... Throttle valve, 6.25... Drive means 7.24... Control means. 8...Brake, 11...Vehicle speed automatic control device. Patent applicant: Jidosha Electric Industry Co., Ltd. Representative patent attorney Yutaka Oshio J1 diagram

Claims (1)

[Claims] (1) A vehicle speed sensor that outputs operational data proportional to the actual vehicle speed, a command switch that outputs a cruise command signal, a vehicle speed storage means that stores vehicle speed data from the vehicle speed sensor when the command switch is operated, and a drive motor. A limit switch is provided which drives the throttle valve via an electromagnetic clutch by the rotation of the drive motor and detects whether the throttle valve is fully open or fully closed, and when the limit switch is detected, the drive motor is A motor-driven actuator for stopping the actuator, a drive means for rotating a drive motor of the actuator in forward and reverse directions, and a control means for sending a command to the drive means in response to a difference between an actual vehicle speed and a stored vehicle speed. In the automatic vehicle speed control system, the actuator is provided with a cutoff means that cuts off electricity to the drive motor in the opening direction of the throttle valve when the vehicle speed control is canceled by the brake pedal depression operation. Features automatic vehicle speed control device.