JPS6315171B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speed control system, ie, an autodrive. especially,
This relates to a device that releases autodrive by braking or actuating an actuator.

[Conventional technology]

The speed control systems that have been proposed up until now have the current vehicle speed set, speed increase set, deceleration set, and return set as set functions, and have the foot brake and parking brake as cancel functions. Brake signals from automatic transmission vehicles, neutral signals in automatic transmission vehicles (clutch signals in manual transmission vehicles), overvoltage signals for computer protection, vehicle speed signals such as 120 km /
There is a cancellation by the vehicle speed signal when driving at low speeds below h.

These set and cancel signals serve as trigger pulses for the flip-flop circuit, but their pulse widths (times) are set to extremely short times (on the order of μsec) because there is no clear regulation.
Therefore, the horn, head lamp, turn signal,
Computer malfunctions frequently occurred due to noise generated by various electrical loads such as power windows. Conventional countermeasures have been to add noise-absorbing diodes to the noise source, change the wiring harness, and install filters in the computer.

Further, in conventional devices of this type, automatic constant speed running cannot be canceled other than by feedback from a self-holding circuit, and therefore, usability is not sufficient. For example, when a transistor at the final stage of a self-holding circuit fails to become non-conductive and noise occurs in its base circuit, there is a risk that it will not be able to be canceled. For fuel safety in times like this,
This allows automatic constant speed driving control to be canceled on the actuator side as well.

[Means for solving problems]

An object of the present invention is to provide a speed control circuit for an automobile in which a computer used in the speed control system will not fundamentally malfunction due to noise generated by various electrical loads.

Therefore, a large number of various noise waveforms on each set and cancel signal line were observed, and the maximum value Tn of the noise time width was determined. At the same time, the set and cancel trigger time widths operated by various drivers were observed, and their minimum value Td was determined.
As a result, the maximum value Tn of the noise time width and set,
It was found that there is a wide time interval between the minimum value Td of the cancel trigger time width. Therefore, if the trigger time Tt of the flip-flop is made extremely larger than the maximum value Tn of the noise time width and smaller than the minimum value Td of the set/cancel trigger time width,
The computer determines the trigger time of the flip-flop.
It is conceivable that malfunctions can be reliably prevented by responding only to the Tt signal.

Note that as a result of making the flip-flop trigger time Tt much larger than the maximum value Tn of the noise time width, the minimum value of the set cancel trigger time width
Even if it becomes almost equal to Td, malfunction of the computer can be reliably prevented in practice. This is because, if we take the brake signal from the foot brake, which is one of the cancel signals, as an example, when the driver feels danger and wants to cancel autodrive, he keeps pressing the foot brake, so the flip-flop trigger time Tt
The extension of is not dangerous.

In the present invention, in particular, the automatic constant speed driving is doubly canceled by a first switch that keeps the stop lamp switch normally open and is closed by braking operation, and a second switch that is linked to the opening and closing of this first switch. I made it possible.

Furthermore, in the present invention, a cancel signal is given to both the self-holding circuit and the cancel circuit such as the safety magnetic clutch circuit by actuator side operation, thereby doubly canceling automatic constant speed driving. ).

An object of the present invention is to automatically control the opening of the throttle valve based on a desired speed command signal to cause the vehicle to travel at a constant speed at an arbitrary preset speed, and to turn on the stop lamp switch in accordance with the braking operation of the vehicle. In a release device for an automobile speed control circuit that cancels automatic constant speed driving when activated, a stop lamp switch that becomes conductive when a braking operation is performed has a first switch that is normally non-conductive, and a stop lamp switch that is connected to a first switch that is normally non-conductive, and a stop lamp switch that is activated to cancel automatic constant speed driving. The non-power side of the first switch constitutes a circuit connected to the self-holding circuit, and the non-power side of the second switch constitutes a circuit connected to the cancel circuit. Furthermore, the second switch is connected to the power supply side via a fuse, and the second switch is connected to the power supply side via a fuse.
Voltages are extracted from the non-power side of the switch and the non-power side of the second switch and used as automatic constant-speed driving cancellation signals, and automatic constant-speed driving is canceled from both the self-holding circuit and the cancel circuit. An automotive speed control circuit featuring: The opening of the engine slot valve is maintained by a set signal given from an actuator and a set switch that control the opening of the engine slot valve to a predetermined opening necessary for maintaining a constant speed of the vehicle, and a speed control signal is output to the actuator to control the vehicle speed. A self-holding circuit for returning and holding the actuator at a constant speed, a release means such as a safety latch that disables the operation even if a speed control signal is applied to the actuator, and a release signal is supplied to the release means such as the safety latch. This is a release device for an automobile speed control circuit that cancels automatic constant-speed running, which consists of a cancel circuit, and further includes a self-holding circuit that obtains a release signal from at least a stop lamp switch in order to cancel constant-speed control of the vehicle. An automobile speed control circuit characterized in that a cancel signal is given to both of the cancel circuit and the cancel circuit. This is achieved by

In the automobile control circuit according to the present invention, the trigger pulse time of the cass cell circuit such as the self-holding circuit safety magnetic clutch circuit is set to be shorter than the pulse time of noise from the horn, headlamp, blinker, power window, etc.
Computer malfunctions caused by these noises and drive operations are fundamentally eliminated.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a speed control circuit for an automobile according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the entire speed control system. A vehicle speed signal proportional to the vehicle speed from the vehicle speed sensor 12 of the speed control system 10 is supplied to the computer 14 and compared with a voltage corresponding to the throttle opening from the throttle opening sensor 18 provided in the actuator 16. When the opening equivalent voltage is higher, the speed increasing relay 20 is energized and the actuator 16
is rotated to the speed-increasing side and opens the carburetor throttle 22, so that the rotational speed of the engine 24 increases.

(b) When the voltage corresponding to the throttle opening is lower, the deceleration relay 26 is energized, the actuator 16 is rotated to the deceleration side, and the carburetor throttle 2
2 is closed, the rotational speed of the engine 24 decreases.

In this way, the vehicle speed is maintained constant.

The computer 14 corresponds to the brain of the autodrive device, and includes a D-A converter circuit 28 that converts pulses received from the vehicle speed sensor 12, such as a reed switch for detecting vehicle speed, into a voltage equivalent to vehicle speed, and automatically controls autodrive at high and low speeds. A high-speed limiter circuit 30 for canceling, a low-speed limiter circuit 32, a self-holding circuit 34 for providing a set and cancel function, a memory circuit 36 for storing vehicle speed, a vehicle speed voltage and a throttle opening sensor 18 in the actuator 16, for example, a potentiometer. A speed increase control circuit 38 that generates a speed increase signal and a deceleration signal by comparing and determining the voltage corresponding to the throttle opening that is fed back from the engine, a deceleration control circuit 40, and a safety magnetic clutch that controls a safety clutch 42 for double safety. circuit 44, an overvoltage prevention circuit 46 for preventing the safety magnetic clutch circuit 44 from being affected by overvoltage, and a constant voltage power supply that always supplies a stable voltage to each functional section regardless of battery voltage fluctuations, etc. The circuit 48 is provided.

FIG. 2 is a circuit diagram showing details of the self-holding circuit 34 used in the speed control system of FIG. 1. In auto drive, the self-holding circuit 34 is used for self-holding by a set switch 50 (auto drive continues to be on even if the switch is released), a cancel switch such as a stop lamp switch 52, a parking brake, a neutral safety switch, or a clutch switch. 54, the output of which is supplied from point A to the safety magnetic clutch circuit 44 and from point B to the deceleration control circuit 40.

To explain the self-holding operation by the set switch 50, when the vehicle speed is higher than the limit speed, the low speed limiter 32
Therefore, the base voltage is supplied to the transistor Tr21, but since there is no emitter circuit until the set switch 50 is pressed, Tr21 remains off. As a result, capacitor 21 becomes resistor R23, R
Since it is charged through 24, the transistor Tr2
2 is turned on and capacitor C is turned on to lower the voltage at point B.
The charge stored in transistor Tr22 is discharged through R25, and transistor Tr23 is turned off. A
When the voltage at the point increases, the base voltage is supplied to a safety magnetic clutch circuit 44, which will be described later.

When the set switch 50 is pressed, the transistor
Since the emitter of Tr21 is grounded, Tr21
turns on, the voltage at point A decreases, and capacitor C
21 is discharged through the input impedance of resistor R25 and Tr22, transistor Tr22 is turned off, and the voltage at point B increases. As a result, the capacitor C22 is charged through the resistor R26 and the transistor Tr23 is turned on. When Tr23 turns on
Since another emitter circuit is formed in Tr21, even if the set switch 50 is released, Tr21 continues to be turned on and self-maintains. When the voltage at point B increases, an output is supplied to the deceleration control circuit 40.

To explain the cancel operation by the stop lamp switch 52, the brake pedal (not shown)
When the switch is pressed, the battery voltage 56 is applied by the stop lamp switch 52, so that the capacitor C21 is charged through the resistor R24, turning on the transistor Tr22. As a result, the voltage at point B decreases, capacitor C22 is discharged, transistor Tr23 is turned off, Tr21 is also turned off, and self-holding is canceled. Furthermore, even when the speed exceeds the high speed limit, the voltage is supplied from the high speed limiter 30 to point A, so that self-holding is canceled in the same manner.

To explain the cancel operation by the parking brake switch 54, the parking brake switch 54 grounds the point B, so the capacitor C22 is discharged, the transistor Tr23 is turned off, and the transistor Tr21 is turned off, so that self-holding is canceled. Cancellation by the neutral safety switch or clutch switch is performed in the same manner.

Finally, to explain the cancellation by the low speed limiter 32, when the vehicle speed falls below the low speed limit, the low speed limiter 32 stops outputting, so the transistor Tr.
21 is turned off. As a result, the voltage at point A increases, capacitor C21 is charged through resistors R23 and R24, and transistor Tr22 is turned on, so capacitor C22 is discharged and transistor Tr2
3 is turned off and self-holding is canceled.

As explained above, capacitors C21 and C2
2, since there is a constant circuit, the trigger time Tt of the flip-flop circuit is extended by a predetermined time,
As a result, the computer 14 is reliably protected from malfunctioning due to noise.

FIG. 3 is a circuit diagram illustrating one embodiment of the safety magnetic clutch circuit 44 used in the speed control system of FIG. This is the safety magnetic clutch 4 in the actuator.
2 operates as a self-holding circuit, and disconnects the safety magnetic clutch circuit 44 by turning on and off under exactly the same conditions as the self-holding circuit 34 described above. Further, when the self-holding circuit 34 is canceled, its output is also canceled.

The self-holding operation by the set switch 50 will be explained. When the set switch 50 is pressed, point C is grounded and the transistor Tr31 is turned on.
A current flows through the safety clutch solenoid 58, and a voltage is also applied to the collector of the transistor Tr34. However, when the set switch 50 is pressed, the self-holding circuit 34 starts from point A as described above.
Since the base voltage to Tr34 is cut off, Tr34 remains off. As a result, capacitor C32
is charged through resistor R36 and the transistor
Since Tr 32 is turned on and a ground circuit is created at the base of Tr 31, Tr 31 continues to be turned on even when the set switch 50 is released, and maintains itself.

The stop lamp switch 60 is the first switch 6
1 and a second switch 62. The first switch 61 is normally open, and the second switch 6
2 is normally closed. The first switch 61 closes when the brake pedal 63 is depressed. In conjunction with this, the second switch 62 opens. An ignition switch 55 is connected in series below the second switch 62, a stop lamp fuse 53 is connected in series to the ignition switch 55, and a battery 56 is connected in series to the stop lamp fuse 53. be.

Cancel operation by the stop lamp switch 60 is performed when the brake pedal 63 is depressed.
First switch 61 of stop lamp switch 60
is closed, a battery voltage 56 is applied to the base of the transistor Tr34 via the stop lamp fuse 53 and the ignition switch 55, and the transistor Tr34 is turned on. As a result, capacitor C32 is connected to resistor R35 and transistor Tr3.
2 and transistor 32 is turned off. Also, by stepping on the brake pedal 63, the stop lamp switch 6
Since the second switch 62 at point 0 is opened and the power to point D is cut off, it is doubly canceled. Further, even if the stop lamp fuse 53 is blown and the first switch 61 does not operate, the second switch is used to release the stop lamp.

In the cancel operation by the parking brake switch 54, since the point E is grounded by the parking brake switch 54, the charge stored in the capacitor C32 is discharged by the input impedance of R35 and Tr32, and Tr32 is turned off.
Therefore, the transistor Tr31 is turned off, the current to the safety clutch solenoid 58 is cut off, and the self-holding is canceled. Cancellation by a neutral safety switch or clutch switch operates in the same manner.

Cancellation by the low-speed and high-speed limiters is such that at vehicle speeds outside the limited low-speed and high-speed ranges, the self-holding circuit 34 is canceled by the low-speed and high-speed limiters 32 and 30 as described above, so the voltage at point A of the self-holding circuit 34 is After this voltage passes through the resistor 37 and charges the capacitor C33, the transistor
Turn on Tr34. As a result, the voltage at point E decreases and thereafter operates in the same manner as the parking brake switch 54 described above, canceling the self-holding.

Finally, the cancel operation by the overvoltage prevention circuit 46 will be explained. When an overvoltage is applied to point D, the resistance R
Current flows through transistor Tr33, turning on transistor Tr33, and since the base of Tr31 becomes the same potential as point D, Tr31 turns off. As a result, the potential at point E decreases, and the charge stored in capacitor C32 is discharged through resistor R35, causing transistor
Tr32 is also turned off. Therefore, even after the overvoltage disappears and transistor Tr33 is turned off, there is no emitter circuit of transistor Tr31, so Tr
31 remains off, the safety clutch solenoid 58 is deenergized, and self-holding is released.

〔Effect of the invention〕

As explained above, in the present invention, the stop lamp switch is provided with a first switch that is normally open by closing the circuit by braking operation, and a second switch that is normally closed in conjunction with the opening and closing of the first switch. Therefore, the voltage is extracted from the non-power side of the second switch and the stop lamp side of the first switch, and the automatic constant speed driving is canceled twice as the automatic constant speed driving cancellation signal. Cancellation (release) is reliably performed, and even if the stop lamp fuse is blown and the first switch does not operate, it is possible to cancel (release) only with the second switch.

Furthermore, automatic constant speed driving can be canceled again.
In addition to canceling the feedback control, it is also released by mechanical means such as a magnetic clutch, so cancellation is certain because it can be released twice, and unless both the self-holding circuit and the cancel circuit are damaged, cancellation (release) is possible. ) It doesn't happen that it can't be done.

In addition, since the automatic constant speed traveling can be canceled on the actuator side as well, there is an effect that the automatic constant speed traveling can be canceled quickly with good responsiveness.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an entire embodiment of an automobile speed control circuit according to the present invention, FIG. 2 is a circuit diagram showing an embodiment of a self-holding circuit used in the device of FIG. 1, and FIG. FIG. 3 is a circuit diagram showing one embodiment of the safety magnetic clutch circuit used in the apparatus of FIG. 14... Computer, 34... Self-holding circuit, 44... Safety magnetic clutch circuit,
C21, C22, C32, C34... Capacitor, 60... Stop lamp switch, 61...
First switch, 62...Second switch, 63...
Brake pedal, 53... Stop lamp fuse, 16... Actuator, 22... Engine throttle valve, 42... Safety clutch,
52...Stop lamp switch, 50...Set switch.

Claims (1)

[Claims] 1. Automatically controls the opening of the throttle valve based on a desired speed command signal, causes the vehicle to run at a constant speed, and controls the stop lamp switch when braking the vehicle. In a release device for an automobile speed control circuit that cancels automatic constant speed driving when turned on, a stop lamp switch that becomes conductive when braking is performed is a first switch that is normally non-conductive;
It opens and closes in conjunction with the opening and closing of the first switch, and is normally conductive.The non-power side of the first switch constitutes a circuit connected to the self-holding circuit, and the non-power side of the second switch constitutes a circuit connected to the self-holding circuit. constitutes a circuit connected to the cancel circuit, and furthermore, the second switch is connected to the power supply side via a fuse, and the voltage is taken out from the non-power side of the first switch and the non-power side of the second switch and automatically regulated. A speed control circuit for an automobile, characterized in that the automatic constant speed driving is canceled from both a self-holding circuit and a cancel circuit by using a speed driving cancellation signal. 2. An actuator that controls the opening degree of the engine throttle valve to a predetermined opening degree necessary for the vehicle to maintain a constant speed, and a set signal given from a set switch, which outputs a speed control signal to the actuator and controls the vehicle speed. A self-holding circuit for returning and maintaining the speed at a constant speed, a release means such as a safety latch that disables the operation even if a speed control signal is given to the actuator, and a release signal is supplied to the release means such as the safety latch. This is a release device for an automobile speed control circuit that cancels automatic constant-speed running, which consists of a cancel circuit, and further includes a self-holding circuit that obtains a release signal from at least a stop lamp switch in order to cancel constant-speed control of the vehicle. An automobile speed control circuit characterized in that a cancel signal is given to both of the cancel circuit and the cancel circuit.