JPH0537855Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a constant speed traveling device for an automobile or the like, and particularly relates to a power supply circuit for a constant speed traveling device.

[Prior Art] As a conventional constant speed traveling device for an automobile of this type, there is a technique disclosed in Japanese Patent Application Laid-Open No. 60-33131.

The technology disclosed in the above publication includes a control means for controlling the opening degree of a throttle valve provided in an intake pipe of a vehicle internal combustion engine, and a vehicle speed detection means for generating a vehicle speed signal in response to the traveling speed of the vehicle. , a set vehicle speed storage means for causing the vehicle to run at a constant speed at a desired set speed, and a comparison between the actual vehicle speed from the vehicle speed detection means and the set vehicle speed of the set vehicle speed storage means, and a method corresponding to the speed deviation. comprising a control signal generation means for generating a signal for controlling the control means, and a high output detection means for generating a high output signal when the output of the vehicle internal combustion engine equipped with a supercharger exceeds a predetermined output, The gain of the control signal generating means is changed in response to the high output signal of the high output detecting means.

[Problems to be Solved by the Invention] The above constant speed driving device for automobiles can cancel constant speed driving control by operating the brake pedal. The control signal generating means receives the cancel signal with the highest priority, stops applying the connection signal to the electromagnetic clutch, and reverses the DC motor which is to be continuously decelerated. Therefore, even if the electromagnetic clutch is not released, the opening of the throttle valve can be moved in the closing direction by reversing the DC motor.

However, in the above-mentioned constant-speed traveling device for automobiles, in the case of a power failure in the control system of the constant-speed traveling device for automobiles, the power to the DC motor is turned off.
There was a problem in that constant speed driving control was not released if the electromagnetic clutch was not released. That is, there is a problem in that when the power to the DC motor is turned off, the DC motor stops rotating.

Therefore, the present invention was made to eliminate the above-mentioned problems, and an object of the present invention is to provide a constant speed traveling device that can reliably cancel the constant speed traveling control state even in the case of a power failure in the control system of the constant speed traveling device. That is.

[Means for Solving the Problems] The constant speed traveling device according to the present invention includes a throttle valve driving means for controlling the opening and closing of the throttle valve according to a vehicle speed deviation, and a throttle valve for detecting the opening and closing state of the throttle valve. a sensor means, an output signal for canceling constant speed driving control to maintain the set predetermined vehicle speed, and an output indicating that the throttle valve is in an open state when the output of the throttle sensor means is equal to or higher than a predetermined value; It consists of a power supply circuit that directly supplies power from the vehicle power source to the throttle valve driving means based on the output of the discriminating means that inputs the signal.

[Function] In the present invention, the output signal for canceling constant speed driving control and the output of the throttle sensor means for detecting the opening/closing state of the throttle valve are determined by the determination means to be equal to or higher than a predetermined value. When an output signal indicating that the throttle valve is in an open state is input, the throttle valve is closed by the throttle valve driving means by a power supply circuit that directly supplies power to the throttle valve driving means from the vehicle power source. . Therefore, even if a power supply abnormality occurs in the control system of the constant speed traveling device, the throttle valve can be reliably closed when canceling the traveling control.

[Example] Hereinafter, a constant speed traveling device according to an example of the present invention will be described.

FIG. 1 shows an overall configuration diagram of a constant speed traveling device according to a first embodiment of the present invention.

In this configuration, the electronic control unit CPU consists of a single-chip microcomputer or the like, and constitutes the electronic control means. electronic control unit
Power is supplied to the CPU from the vehicle power supply E via the fuse F, the ignition switch IS, and the power switch SW ₀ of the constant speed running device, and the CPU also detects depression of the brake pedal (not shown). A brake switch _SW1 , a reed switch _SW2 that detects a vehicle speed signal, and a clutch switch that detects depression of a clutch pedal (not shown).
SW ₃ , set switch SW ₄ , resume switch
The signal output of SW ₅ is input.

The brake switch _SW1 , which opens and closes in conjunction with the brake pedal of the vehicle, is supplied with power from a vehicle power source E via a fuse F. A stop lamp L is connected to the brake switch _SW1 , and the stop lamp L lights up when the brake switch _SW1 is turned on (closed).

Near reed switch SW ₂ , there is a permanent magnet PM connected to a speedometer cable (not shown).
is placed, and when the vehicle moves, the permanent magnet
When the PM rotates, the contacts of the reed switch SW2 open and close, and a pulse (vehicle speed signal) with a frequency proportional to the vehicle speed is sent to the electronic control unit CPU. That is,
Permanent magnet connected to speedometer cable
The PM and reed switch SW ₂ constitute a vehicle speed sensor and detect the actual vehicle speed.

Further, the clutch switch SW ₃ is opened and closed in conjunction with the clutch pedal of the vehicle. The set switch SW ₄ and the resume switch SW ₅ consist of push button switches, and are arranged at positions that are easy for the driver to operate. When the set switch SW ₄ is pressed, the vehicle speed is memorized and constant speed driving control is started, and the constant speed driving is canceled by the operation of the brake switch SW ₁ , but the stored vehicle speed remains. When the resume switch SW ₅ is pressed, constant speed driving control is started again at the memorized vehicle speed before constant speed driving was canceled.

Here, the above-mentioned resume switch SW ₅ is for restarting the once-released constant speed driving control at the stored controlled vehicle speed, and the clutch switch SW ₃ and brake switch SW 1 are for canceling the constant speed driving control. This is a release switch means.

The output of the electronic control unit CPU is input to the relay RY1 which rotates the DC motor 1 in the normal rotation direction.
Further, the other output is inputted via the diode _D1 to the relay RY2 which rotates the DC motor 1 in the reverse direction. And the other output is electromagnetic clutch B
is input to the electromagnetic coil 4 that constitutes the.

The rotational output of the DC motor 1 is
The drive source A is decelerated by the worm 2 and worm gear 3 of the drive source A, which is composed of a worm 2 and a worm gear 3, and is made up of a cable 8 and a drive pulley 6 that winds it through an electromagnetic clutch B that consists of an electromagnetic coil 4, a clutch plate 5, etc. It is output to output link C. The output of the output link C rotates the shaft of the throttle valve 7, and controls the opening and closing of the throttle valve 7 disposed in the intake pipe of a vehicle internal combustion engine. These driving source A, electromagnetic clutch B, and output link C constitute a throttle valve driving means for controlling the opening and closing of the throttle valve 7.

A variable resistor is mounted on the shaft of the throttle valve 7.
The rotation axis of VR ₁ is connected. The detection output of variable resistor _{VR 1} consisting of a series circuit of resistor R 1 , variable resistor VR ₁ and resistor R ₂ is detected when the shaft of variable resistor VR ₁ is connected to the throttle valve driving means and the accelerator pedal. It is connected to the shaft of the throttle valve 7 and obtains the detection output of the variable resistor VR ₁ in proportion to the opening degree of the throttle valve 7. The variable resistor VR ₁ constitutes the throttle sensor means. It is.

The detection output of _the variable resistor VR ₁ , which is composed of a series circuit of the resistor R 1 , the variable resistor VR ₁ and the resistor R ₂ of the throttle sensor means, is equal to the predetermined threshold value TH obtained by the variable resistor VR ₂ . comparator to compare
It is entered in COMP. Said comparator
The output of COMP is input to the AND gate AND.

The output of the OR gate OR is input to the AND gate AND, and the OR gate OR is the operation gate circuit of the power switch SW ₀ of the constant speed traveling device.
The operation of clutch switch SW ₃ through NOT ₁ and detecting clutch depression is controlled by the NOT circuit.
The output of the operation of the brake switch SW ₁ , which detects depression of the brake pedal, is input via NOT ₂ . Under normal constant speed driving control, the output of the NOT circuit NOT ₁ is the power switch SW _0.
is on, so the “L” (low level) not circuit
NOT ₂ output is when clutch switch SW ₃ is off,
The input is set to “H” by a pull-up resistor (not shown).
(High level)", the output is "L", and brake switch SW ₁ is off, so
All “L” levels are input to the OR gate OR.
However, if power switch SW ₀ is off, clutch switch SW ₃ is on, or brake switch
When SW ₁ is turned on and the constant speed running control is canceled, the output of the OR gate becomes "H". Therefore, at this time, if the detection output of the variable resistor VR ₁ of the throttle sensor means is greater than the predetermined threshold TH and the output of the comparator COMP is "H", the output of the AND gate AND is output from the diode D ₂ is input to relay RY2 which rotates DC motor 1 in the reverse direction.

Note that the above-mentioned NOT circuit NOT ₁ and NOT circuit
NOT ₂ , OR gate OR, AND gate AND, comparator COMP, relay RY2, and the output Vcc of a constant voltage power supply (not shown) are supplied with power from other independent circuits, independent of the electronic control unit CPU of the constant speed traveling device. This constitutes a power supply circuit that directly supplies power from the vehicle power supply E to the throttle valve drive means, which is the DC motor 1 constituting the drive source A. That is, the power supply circuit that directly supplies power from the vehicle power supply E to the throttle valve drive means is at least
It includes a power source for driving the DC motor 1 that constitutes the. Further, if necessary, the throttle sensor means for detecting the opening/closing state of the throttle valve 7, the output signal for canceling the constant speed traveling device for maintaining the vehicle speed, and the output of the throttle sensor means are set to a predetermined value or more. This includes a circuit constituting a determining means for inputting an output signal indicating that the throttle valve 7 is in an open state.

The constant speed traveling device configured as described above can operate as follows. Note that constant speed traveling control is a well-known operation, so its explanation will be simplified here.

During constant speed driving control, the stored vehicle speed is compared with the vehicle speed at that time in the electronic control unit CPU, and a signal is generated to energize relay RY1 or relay RY2 to rotate DC motor 1 forward or reverse so that the difference is equal. Output. For example, when acceleration is required, the relay RY1 is energized, the DC motor 1 is rotated in the forward direction, and the opening degree of the throttle valve 7 is widened. vice versa,
When deceleration is required, the relay RY2 is energized, the DC motor 1 is reversely rotated, and the opening degree of the throttle valve 7 is narrowed.

When constant speed driving control is being performed in this way, the clutch switch is depressed and clutch switch SW ₃ is turned on, or the brake pedal is depressed and brake switch SW ₁ is turned on and constant speed driving control is canceled. When this is done, the electromagnetic clutch B is released and the throttle valve 7 is made to respond to the accelerator pedal.

As mentioned above, when the clutch pedal is depressed during constant speed driving control and clutch switch SW ₃ is turned on, and constant speed driving control is canceled, or
The brake pedal is depressed and the brake switch is activated.
When SW ₁ is turned on and constant speed driving control is canceled, and when constant speed driving device power switch SW ₀ is turned off during constant speed driving control and constant speed driving control is canceled, the output of the OR gate OR is becomes “H”.

At this time, the detection output of variable resistor VR ₁ consisting of a series circuit of resistor R ₁ , variable resistor VR ₁ , and resistor R ₂ is an output corresponding to the opening degree of throttle valve 7; A comparator COMP compares the state of the throttle valve 7 with a predetermined threshold value TH corresponding to a fully closed state or a predetermined closed state. The opening degree of the throttle valve 7 is controlled by the variable resistor VR ₂
The output of the comparator COMP is “H” when it is open from the fully closed or predetermined closed state set in
, and opens the AND gate AND.

Therefore, when the opening degree of the throttle valve 7 is more open than the fully closed or predetermined closed state set by the variable resistor _VR2 , the output of the AND gate AND is transmitted to the DC motor ₁ via the diode D2. Relay RY2 is energized to rotate in the opposite direction, and throttle valve 7 is rotated in the direction to close the opening.
When the opening degree of the throttle valve 7 reaches the fully closed or predetermined closed state set by the variable resistor VR ₂ due to the rotation of the DC motor 1 in the opposite direction, the comparator
The CONP output becomes “L” and the AND gate
Close AND. Therefore, when the opening degree of the throttle valve 7 is fully closed or in a predetermined closed state set by the variable resistor VR ₂ , or once the opening degree of the throttle valve 7 is fully closed as set by the variable resistor VR ₂ . Alternatively, when a predetermined closed state is reached, the output of the NOT circuit NOT ₃ becomes "L", and the DC motor 1 is not rotated in the reverse direction.

Further, FIG. 2 shows an overall configuration diagram of a constant speed traveling device according to a second embodiment of the present invention. In the drawings, the same reference numerals and symbols as in the first embodiment indicate the same or corresponding parts. In particular, in this embodiment, only the configurations that are different from the first embodiment will be explained.

When the clutch pedal is depressed during constant speed cruise control and clutch switch SW ₃ is turned on and constant speed cruise control is canceled, or when the brake pedal is depressed and brake switch SW ₁ is turned on and constant speed cruise control is activated. Further, when the constant speed driving control is canceled, the power switch _SW0 of the constant speed driving device is turned off during the constant speed driving control, and when the constant speed driving control is canceled, the output of the OR gate OR becomes "H". At this time, if the detection output of the variable resistor VR ₁ constituting the throttle sensor means is greater than the predetermined threshold TH, the comparator
If the COMP output is “H”, the AND gate
The output of the AND output sets a set-reset type flip-flop R-SFF consisting of two NORs for self-holding. At this time, the output of the flip-flop R-SFF becomes "H" and the diode
Relay RY2, which rotates DC motor 1 in the reverse direction, is energized via _D2 . Then, when the opening degree of the throttle valve 7 reaches the fully closed or predetermined closed state set by the variable resistor VR ₂ due to the rotation of the DC motor 1 in the opposite direction, the output of the comparator COMP becomes "L", and the AND gate Close the AND,
The flip-flop R-SFF is reset by the NOT circuit NOT ₃ , its output becomes "L", and the DC motor 1 is no longer rotated in the reverse direction. Therefore, when the opening degree of the throttle valve 7 is fully closed or in a predetermined closed state set by the variable resistor VR ₂ , or once the opening degree of the throttle valve 7 is set by the variable resistor VR _2.
When it reaches the fully closed or predetermined closed state set in
At NOT circuit NOT ₃ , the output of flip-flop R-SFF becomes "L", and the DC motor 1 is no longer rotated in the reverse direction.

Furthermore, in the embodiment shown in FIG. 1, when the opening degree of the throttle valve 7 is more open than the fully closed or predetermined closed state set by the variable resistor VR ₂ , the output of the AND gate AND is connected to the diode D ₂ . The relay RY2 is energized to rotate the DC motor 1 in the opposite direction, and the throttle valve 7 is rotated in the direction to close the opening.However, when the terminal on the relay RY1 side of the electronic control unit CPU is If control becomes uncontrollable at "H", it becomes impossible for the DC motor 1 to rotate in the opposite direction. In this embodiment, this problem is solved by providing an inhibit gate INH.

That is, under normal control by the electronic control unit CPU, when relay RY1 is excited to rotate DC motor 1 in the forward direction, the output of diode _D1 becomes "L" and inhibit gate INH
Since it is open, the DC motor 1 can be rotated in the forward direction by a signal from the electronic control unit CPU.

In addition, if the terminal on the relay RY1 side of the electronic control unit CPU is "H" and control becomes uncontrollable, the opening degree of the throttle valve 7 will be set to the fully closed or predetermined closed state set by the variable resistor _VR2 . If it were more open,
The output of the AND gate AND is relayed via diode D ₂ to rotate DC motor 1 in the opposite direction.
At the same time, the output of diode _D2 closes the inhibit gate INH and de-energizes relay RY1. Therefore, the operation of relay RY2 causes DC motor 1 to rotate in a direction that closes the opening of throttle valve 7.

Note that in this embodiment as well, the above-mentioned knot circuit
NOT ₁ and NOT circuit NOT ₂ and NOT circuit
NOT ₃ , OR gate OR, AND gate AND, comparator COMP, relay RY2, flip-flop R-SFF, and output of constant voltage power supply (not shown)
Vcc is supplied with power regardless of the constant speed running device.

In this way, the constant speed traveling device of each of the above embodiments is
In a constant speed driving device that controls the opening and closing of a throttle valve 7 of a vehicle internal combustion engine in accordance with a vehicle speed deviation and controls running to maintain a predetermined vehicle speed, the throttle valve 7 is opened and closed in accordance with the vehicle speed deviation. Throttle valve 7 driving means consisting of a controlling drive source A, electromagnetic clutch B and output link C; throttle sensor means consisting of a variable resistor _VR1 etc. for detecting the opening/closing state of the throttle valve 7;
An output signal that turns off the power switch SW ₀ of the constant speed traveling device that cancels traveling control for maintaining the vehicle speed, or turns on the clutch switch SW ₁ , and the output of the throttle sensor means when the throttle reaches a predetermined value or more. A discriminating means consisting of a comparator COMP and an AND gate AND etc. inputting an output signal indicating that the valve 7 is open, and the output of the discriminating means are used to directly connect the drive source A etc. from the vehicle power source E. The throttle valve driving means is equipped with a power supply circuit that supplies power to the throttle valve driving means.

Therefore, when the constant speed driving control is canceled and the vehicle starts normal driving, even if the electromagnetic clutch B does not release due to an abnormality in the electromagnetic clutch B, the DC motor 1 is rotated in the reverse direction and the throttle valve 7 is closed. It can be controlled in the direction.

In particular, when the output signal for canceling the travel control to maintain the set predetermined vehicle speed and the output of the throttle sensor means for detecting the opening/closing state of the throttle valve 7 exceed a predetermined value, the throttle valve 7 opens. The throttle valve 7 is closed by the throttle valve driving means by a power supply circuit that supplies power directly from the vehicle power supply E to the throttle valve driving means when an output signal indicating that the throttle valve is in a state of Therefore, even if a power supply abnormality occurs in the control system of the constant speed traveling device, the throttle valve 7 can be reliably closed when canceling the traveling control.

In addition, the power supply for the circuit required for control at this time is
Since the power source is a power source other than the power input to the component circuit of the constant speed traveling device, it is possible to cope with turning off the power switch _SW0 of the constant speed traveling device which cancels traveling control.

The throttle valve driving means for controlling the opening and closing of the throttle valve according to the vehicle speed deviation in the above embodiment is composed of a driving source A, an electromagnetic clutch B, and an output link C, but when implementing the present invention, It can also be used with a negative pressure actuator as the drive source.

Further, the throttle sensor means for detecting the opening/closing state of the throttle valve in the above embodiment uses the variable resistor VR ₁ , etc., but when implementing the present invention, the variable resistor VR ₁ is replaced with the throttle valve. It can be a limit switch that detects the closure of a tuttle valve. In this case, the comparator COMP used in the above embodiment can be omitted.

and a determining means for inputting an output signal for canceling the traveling control for maintaining the vehicle speed of the above embodiment, and an output signal for indicating that the throttle valve is in an open state when the output of the throttle sensor means exceeds a predetermined value. , logic gates and flip-flops R-SFF are used, but the power switch SW ₀ of the constant speed traveling device that cancels the traveling control that maintains the vehicle speed is turned off, or the clutch switch SW ₃ is turned on, or the brake switch SW ₁ is turned off. If the throttle valve drive means is reversed only when the output signal turns on, the flip-flop R-SFF can be omitted. Also, flip-flop R
- If a timer or a monostable circuit is used instead of the SFF, the throttle valve driving means can also be reversed for a predetermined period of time.

Furthermore, as a power supply circuit that supplies electrodes directly from the vehicle power supply to the throttle valve driving means, power is obtained on the output side of the ignition switch IS independently from the power supply circuit used for constant speed driving control.
The power source may be obtained from the power source side of another device. Particularly preferably, if the output detection and throttle sensor means and the AND gate AND when the power switch SW ₀ is turned off, the clutch switch SW ₃ is turned on, or the brake switch SW ₁ is turned on is configured with a switch, this power supply circuit can be omitted.

[Effects of the invention] As described above, the constant speed traveling device of the invention includes a throttle valve driving means that controls opening and closing of the throttle valve according to vehicle speed deviation, and a throttle sensor that detects the opening and closing state of the throttle valve. means, an output signal for canceling the traveling control for maintaining the vehicle speed, and a determining means for inputting an output signal indicating that the throttle valve is open when the output of the throttle sensor means exceeds a predetermined value. Since it is equipped with a power supply circuit that directly supplies power from the vehicle power supply to the throttle valve drive means by the output, an output signal for canceling the traveling control to maintain the predetermined vehicle speed that has been set; When the output of the throttle sensor means for detecting the opening/closing state of the throttle valve exceeds a predetermined value and the output signal indicating that the throttle valve is open is input, the throttle is directly connected to the vehicle power source. A power circuit supplies power to the valve drive means,
The throttle valve can be closed by the throttle valve driving means. Therefore, even in the case of a power failure in the control system of the constant speed traveling device, the state of constant speed traveling control can be reliably canceled.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a constant speed traveling device according to a first embodiment of the present invention, and FIG. 2 is an overall configuration diagram of a constant speed traveling device according to a second embodiment of the present invention. In the figure, CPU...electronic control unit, A...
Drive source, B...Electromagnetic clutch, C...Output link, VR ₁ ...Variable resistor, SW ₀ ...Power switch, SW ₁ ...Brake switch, SW ₃ ...Clutch switch, COMP...Comparator, E ……
Vehicle power source 7...throttle valve.
In addition, in the figures, the same reference numerals and symbols indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a constant-speed traveling device that controls opening and closing of a throttle valve of a vehicle internal combustion engine according to a vehicle speed deviation and controls running to maintain a predetermined vehicle speed, the throttle valve is controlled to open and close according to the vehicle speed deviation. A throttle valve driving means, a throttle sensor means for detecting the opening/closing state of the throttle valve, an output signal for canceling the constant speed driving control for maintaining the vehicle speed, and an output of the throttle sensor means that exceeds a predetermined value. a determination means for inputting an output signal indicating that the throttle valve is in an open state; and a power supply circuit that supplies power directly from the vehicle power supply to the throttle valve driving means based on the output of the determination means. A constant speed traveling device comprising: