JP2558492B2 - Control circuit of constant-speed traveling device for vehicle - Google Patents

Description

The present invention relates to a control circuit for a vehicle constant speed traveling device that uses an actuator having an actuating member that is driven by a motor to perform a vehicle speed control operation. .

<Prior Art> There is a vehicle constant speed traveling device that uses an actuator including an operating member that is connected to a throttle valve and is driven by a motor to perform a vehicle speed control operation.

In such a motor type actuator, a magnetic clutch is interposed between the motor and the operating member so that the clutch is engaged only when traveling at a constant speed and the torque of the motor is transmitted to the operating member. Thus, there is a vehicle in which the accelerator pedal and the motor do not interfere with each other except when traveling at a constant speed. Further, in order to easily determine the initial state of the operating member, a deceleration side limit switch for detecting the initial position is provided, and a deceleration side drive current is supplied to the motor through the deceleration side limit switch, so that the operating member When is returned to the initial position, the limit switch is opened so that the drive current on the deceleration side can be cut off, so that the motor can be prevented from rotating unnecessarily on the deceleration side.

By the way, in this control circuit, the traveling vehicle speed rises when traveling on a downhill road, for example, where the traveling resistance becomes small. Therefore, the deceleration side drive current is supplied to the motor to drive the throttle valve toward the deceleration side. Will be flushed. At this time, if the deceleration side limit switch described above has a failure in the open state, even if the control circuit outputs a signal for passing the deceleration side drive current, that current does not flow to the motor, so the traveling vehicle speed is increased. The problem arises that it cannot be prevented.

Therefore, as disclosed in Japanese Patent Laid-Open No. 60-163735, the above problem can be solved by canceling processing when the traveling vehicle speed during constant-speed traveling exceeds a predetermined value or more than a set vehicle speed. it can. However, when overtaking acceleration by operating the accelerator pedal while driving at a constant speed on a highway, etc., it will be canceled every time the vehicle speed exceeds the set vehicle speed by a predetermined value or more, and it will run at a constant speed after overtaking. In order to continue the operation, there is a disadvantage that the operation becomes complicated, such as the necessity of setting again.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main object of the present invention is to drive when the traveling vehicle speed exceeds a predetermined value or more than the set vehicle speed during constant speed traveling. It is an object of the present invention to provide a control circuit for a vehicle constant-speed traveling device that is improved so as to prevent an increase in vehicle speed and prevent unnecessary cancellation processing.

[Configuration of the Invention] <Means for Solving the Problem> According to the present invention, such a purpose is to calculate a traveling vehicle speed based on a vehicle speed detection signal, and to perform arithmetic control so as to maintain the traveling vehicle speed at a set vehicle speed. There is provided control means for supplying the acceleration and deceleration control signals, a motor for rotating in the forward and reverse directions based on the control signal, and a clutch means for selectively connecting the vehicle speed control means biased in the deceleration direction to the drive shaft of the motor. In a control circuit of a vehicle constant-speed traveling device having an actuator, the control means, when the traveling vehicle speed is within a normal constant-speed traveling control range equal to or lower than a predetermined vehicle speed which is set higher than the set vehicle speed by a predetermined value. Outputs a clutch connection signal to the clutch means and supplies a normal vehicle speed control signal calculated based on a vehicle speed deviation between the traveling vehicle speed and the set vehicle speed to the motor to drive the vehicle. When it is detected that the speed exceeds the predetermined vehicle speed, a clutch disengagement signal is output to the clutch means, and a deceleration control signal having a value increased from a normal value obtained by the calculation is output to the motor. When the traveling vehicle speed returns below the constant vehicle speed, a clutch engagement signal is output to the clutch means, and a normal vehicle speed control is calculated based on the vehicle speed deviation between the traveling vehicle speed and the set vehicle speed. This is achieved by providing a control circuit for a vehicle constant speed traveling device characterized by supplying a signal to the motor.

<Operation> By thus disengaging the clutch means when the traveling vehicle speed exceeds the set vehicle speed by a predetermined value or more, the vehicle speed control operation is interrupted and the vehicle speed control means is urged to the deceleration side. Therefore, the vehicle speed can be forcibly and promptly reduced. Further, since the enhanced deceleration control signal is supplied to the motor at the same time as the clutch is disengaged, the throttle valve can be forcibly fully closed even when the clutch is mechanically stuck, and at the same time, When the vehicle speed returns below the vehicle speed, the normal constant speed traveling control can be performed.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, four transistors Q1 to Q4
By a well-known type transistor bridge circuit consisting of
A forward / reverse drive circuit of a motor 2 as a drive source of an actuator 1 of the vehicle constant speed traveling device is configured. An operating member 4 is connected to the drive shaft of the motor 2 via a magnet clutch 3, and a throttle valve 6 is connected to the operating member 4 via a throttle wire 5. Therefore, when the magnet clutch 3 is in the connected state, the throttle valve 6 is interlocked with the rotation of the motor 2.

In the bridge circuit described above, the emitters of the transistors Q1 and Q2 are connected to the power supply terminal V, and the emitters of the transistors Q3 and Q4 whose collectors are connected to their collectors are connected via the control circuit 7, respectively. It is grounded. Further, both terminals of the motor 2 are connected to the connection points of the collectors of the transistors Q1 and Q3 and the connection points of the collectors of the transistors Q2 and Q4 via normally closed limit switches 8 and 9, respectively. . These operating members 4, throttle wire 5, throttle valve 6
Thus, vehicle speed control means for performing the vehicle speed control operation is configured. Therefore, by supplying an ON signal from the control circuit 7 to the transistors Q1 and Q4, the motor 2 is rotated in a direction to drive the operating member 4 to the acceleration side which is the fully open side of the throttle valve 6, or the transistors Q2 and Q3 are turned on. When turned on, the motor 2 is rotated in a direction in which the operating member 4 is driven toward the deceleration side.

The limit switch 8 is opened when the operating member 4 reaches the acceleration side operating limit, and the limit switch 9 is opened when the operating member 4 reaches the deceleration side operating limit. Switches 8 and 9 are set. Further, the limit switch 8 is connected in parallel with a diode D1 for flowing a deceleration side driving current to the motor 2, and the limit switch 9 is connected in parallel with a diode D2 for flowing a accelerating side driving current to the motor 2. By doing so, it is possible to preferably prevent the motor 2 from excessively rotating.

Further, the exciting coil 10 of the magnet clutch 3 described above.
Are driven by a transistor Q5 which is on / off controlled by the control circuit 7. Further, in the control circuit 7,
For example, a pulse signal is input from the vehicle speed sensor 11,
The traveling vehicle speed is calculated every predetermined cycle time.

Next, an operation procedure according to this embodiment will be described below with reference to FIG.

When the constant speed traveling state is set, the magnet clutch 3 is in the connected state. As the traveling vehicle speed changes up and down with respect to the set value for constant speed traveling, the deviation of the vehicle speed from the set value and the speed difference between the current vehicle speed and the previous vehicle speed are every control cycle (for example, 250 ms). From the control circuit 7, ON signals whose time is changed by the control values calculated based on the calculated acceleration or deceleration are supplied from the control circuit 7 to the transistors Q1 and Q4 or the transistors Q2 and Q3, respectively. Rotates toward the acceleration or deceleration side to keep the vehicle speed at the set value.

Next, when the vehicle speed rises and the vehicle speed increases, for example, the deceleration signal is supplied to the motor 2, but when the vehicle is relatively steep and long downhill, the deceleration signal is controlled. The vehicle speed continues to increase despite being continuously supplied in each cycle (the portion where the vehicle speed in the figure reaches the upper limit value from the set value). When the value exceeds the upper limit value, which may be, for example, 10 km / h higher than the set value, the control circuit 7 supplies an off signal to the transistor Q5 to disconnect the magnet clutch 3. As a result, the operating member 4 becomes free, and the throttle valve 6 is biased toward the deceleration side by the closing spring (not shown).
The throttle valve 6 is forcibly closed completely, and stronger engine braking is obtained to prevent an increase in vehicle speed.

Further, when the vehicle speed exceeds the upper limit value, the magnetic clutch 3 is disengaged as described above, and the motor 2 is decelerated from the control circuit 7 in order to supply the deceleration control signal, which is increased more than usual, to the motor 2. A signal for turning on both transistors Q2 and Q3 is supplied as a signal for continuously rotating to the side for a predetermined time, which may be, for example, 1 to 2 seconds. This is to reliably drive the throttle valve 6 to the fully closed state even if the magnetic clutch 3 is mechanically stuck. At this time, the deceleration-side motor drive signal is output for a predetermined time, but the deceleration-side limit switch 9 is immediately opened by fully closing the throttle valve 6, so that the motor rotation detection is in the non-detection state.

In the above-described control, the normal constant speed traveling state is not canceled, so that when the vehicle speed decreases and falls below the upper limit value, the constant speed traveling state can be restored again.

When the vehicle speed exceeds the upper limit value, the magnet clutch 3 is turned off and the motor 2 is rotated to the deceleration side at the same time. However, after the motor 2 is rotated to the deceleration side for a predetermined time, the magnet clutch 3 is rotated. May be turned off.

Further, as shown in FIG. 3, for example, if the deceleration side limit switch 9 fails in the open state before the vehicle speed exceeds the upper limit value, the motor 2 does not rotate to the deceleration side, but the magnetic clutch Since the actuating member 4 is in the free state because the valve 3 is in the disconnected state, the throttle valve 6 can be fully closed. Therefore, even if the deceleration side limit switch 9 has a failure in the open state, it is possible to prevent the vehicle speed from rising too high.

Furthermore, when overtaking by operating the accelerator pedal while traveling at a constant speed on a highway, etc., even if the vehicle speed rises above the above-mentioned upper limit, the same processing as the above is performed so that the constant speed traveling is performed. Without canceling the state
It is possible to return to the constant speed running state after the overtaking is completed.

As described above, according to the present invention, when the traveling vehicle speed exceeds the predetermined vehicle speed that is set higher than the set value by a predetermined value, the clutch means is disengaged and is urged in the deceleration direction. By setting the vehicle speed control means in the free state, quick and powerful deceleration control can be performed by, for example, fully closing the throttle valve. Furthermore, since the increased deceleration control signal is supplied to the motor of the actuator at the same time as the clutch is disengaged, the throttle valve can be forced to be fully closed even if the clutch is mechanically stuck. it can. As described above, since the deceleration control is doubled when the vehicle speed abnormally increases, it is possible to perform a more reliable deceleration process. In addition, since the normal constant-speed traveling control is performed when the vehicle speed returns below the predetermined vehicle speed, even if the vehicle speed increases due to the accelerator pedal operation such as when traveling on a long downhill during constant-speed traveling or when overtaking. The effect is extremely large, for example, constant speed traveling control can be performed so that the target vehicle speed is appropriately and smoothly converged without being canceled each time.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram showing a main part of a control circuit of a vehicle constant speed traveling device to which the present invention is applied. 2 and 3 are time charts showing the operating procedure of the vehicle constant-speed traveling device according to the present invention. 1 ... Actuator, 2 ... Motor 3 ... Magnet clutch, 4 ... Actuating member 5 ... Throttle wire, 6 ... Throttle valve 7 ... Control circuit, 8, 9 ... Limit switch 10 ... Excitation coil, 11 …… Vehicle speed sensor

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masahiko Asakura 1-4-1 Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (72) Inventor Hidehiko Anzai 1-4-1 Chuo, Wako-shi, Saitama Stock Inside Honda R & D Co., Ltd. (72) Inventor Mitsuru Matsui 1-2681 Hirosawa-cho, Kiryu-shi, Gunma Mitsuba Electric Manufacturing Co., Ltd. (56) Reference JP 57-71021 (JP, A) JP Sho 58-113551 (JP, A) JP-B-46-38451 (JP, B1)

Claims (1)

(57) [Claims] 1. A control means for calculating a traveling vehicle speed based on a vehicle speed detection signal, performing arithmetic control to maintain the traveling vehicle speed at a set vehicle speed, and supplying acceleration and deceleration control signals, and forward and reverse rotation based on the control signal. A control circuit for a vehicle constant-speed traveling device having a motor for driving the vehicle, and an actuator having clutch means for selectively connecting a vehicle speed control means biased in the deceleration direction to a drive shaft of the motor. However, when the traveling vehicle speed is within the normal constant-speed traveling control range equal to or lower than a predetermined vehicle speed set higher than the set vehicle speed by a predetermined value, a clutch engagement signal is output to the clutch means, and the traveling vehicle speed and the set vehicle speed are When a normal vehicle speed control signal calculated based on the vehicle speed deviation is supplied to the motor and it is detected that the traveling vehicle speed exceeds the predetermined vehicle speed, the clutch disconnection signal is output. When the deceleration control signal, which is output to the clutch means and has a value increased from the normal value obtained by the calculation, is supplied to the motor and the traveling vehicle speed returns below the constant vehicle speed, the clutch is engaged. A signal for outputting to the clutch means, and a normal vehicle speed control signal calculated based on a vehicle speed deviation between a traveling vehicle speed and the set vehicle speed is supplied to the motor. circuit.