JPS6322361Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a constant speed traveling device for a vehicle.

A constant speed traveling device allows a vehicle to travel at a constant speed when a desired vehicle speed is set by an occupant. Therefore, once a vehicle equipped with a constant speed driving device shifts to constant speed driving, it can continue to travel at the set vehicle speed until a release operation is performed.

Furthermore, the constant speed driving device not only allows the vehicle to travel at a constant speed at a set vehicle speed (maintained vehicle speed), but also cancels the maintained vehicle speed when the vehicle is traveling at a constant speed, and uses a negative pressure actuator that operates with negative pressure in the intake pipe. It has a so-called increase function that allows the vehicle speed to increase continuously by opening the throttle valve. Therefore, a constant speed traveling device having this type of function can not only cause the vehicle to travel at a constant speed, but also cancel the constant speed traveling and accelerate the vehicle speed to a desired speed.

By the way, in a vehicle equipped with a constant speed traveling device as described above, especially a vehicle equipped with an automatic transmission with an overdrive, it is difficult to change the vehicle speed from a state in which the vehicle is traveling at a constant speed in overdrive (4th gear) to a maintained vehicle speed. When canceling the automatic transmission and accelerating the vehicle continuously, the automatic transmission is forced to shift to 3rd gear in order to obtain sufficient acceleration.
It is now possible to downshift more quickly (Tokugan Akira)
No. 56-80287). By downshifting in this manner, the engine rotational speed is increased, the intake pipe negative pressure is increased, and the driving force of the negative pressure actuator is increased, so that sufficient acceleration can be obtained.

However, even in low and medium load ranges, where sufficient negative pressure to fully open the throttle valve is introduced into the negative pressure actuator, downshifting occurs when constant speed driving is released. There was a problem in that the driving force of the negative pressure actuator increased significantly, causing the vehicle to accelerate more than the driver expected.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a constant speed traveling device for a vehicle that can improve acceleration traveling performance during speed increase.

In order to achieve the above object, the present invention provides a constant speed traveling device for a vehicle equipped with an automatic transmission. a speed increase signal output section that outputs a signal; a storage circuit that stores a signal generated from the vehicle speed signal generation section immediately before the output of the speed increase signal from the speed increase signal output section is stopped as a maintained vehicle speed; a comparison circuit that compares the signal generated from the vehicle speed signal generating section and the signal stored in the storage circuit; and a vehicle speed maintained by increasing or decreasing intake pipe negative pressure to be introduced based on the comparison result of the comparison circuit. The opening degree of the throttle valve is controlled by the intake pipe negative pressure introduced so that a throttle valve control unit that controls the opening degree of the throttle valve by the intake pipe negative pressure introduced so that the pressure continuously increases;
A high load state detection section detects a high engine load state based on negative pressure in the intake pipe of the engine, and the high load state detection section detects the engine high load state, and the speed increase signal generation section outputs a speed increase signal. The automatic transmission is characterized in that it is provided with a downshift circuit that changes the engagement state of the gears of the automatic transmission so that the automatic transmission performs a downshift when the automatic transmission is shifted down.

The operation of the present invention will be explained below. The vehicle speed signal generating section generates a signal corresponding to the vehicle speed, and the speed increasing signal generating section outputs a speed increasing signal when the speed increasing signal generating section is operated. The storage circuit stores, as a maintained vehicle speed, a signal generated from the speed increase signal generating section immediately before output of the speed increasing signal from the speed increasing signal generating section is stopped. The comparison circuit compares the signal generated from the vehicle speed signal generator and the signal stored in the storage circuit.
The throttle valve control section increases or decreases the intake pipe negative pressure introduced based on the comparison result of the comparison circuit, and controls the opening degree of the throttle valve by the introduced intake pipe negative pressure so that the vehicle speed becomes the maintained vehicle speed. As a result, the vehicle speed is controlled to the maintained vehicle speed without depressing the accelerator pedal, making it possible to drive at a constant speed.

In addition, the throttle valve control section increases the intake pipe negative pressure to be introduced regardless of the comparison result of the comparison circuit when the speed increase signal is output from the speed increase signal generating section, so that the vehicle speed increases continuously. The opening degree of the throttle valve is controlled by the intake pipe negative pressure introduced in this manner.
The high load state detection section detects a high engine load state based on the engine intake pipe negative pressure, and outputs a signal when the high load state occurs. Further, the downshift circuit changes the engagement state of the gears of the automatic transmission so as to downshift when a signal is output from the high load state detection section and a speed increase signal is output from the speed increase signal generation section. As a result, when the speed increase signal generating section is operated in a high-load state where the intake pipe negative pressure is below a predetermined value, the throttle valve control section controls the opening of the throttle valve to continuously increase. At the same time, the automatic transmission is downshifted by the downshift circuit. By downshifting the automatic transmission in this way, when the vehicle speed increases from a high load state, the output torque is increased, the engine rotational speed is increased, the intake pipe negative pressure is increased, and the intake air is increased. Due to the tube negative pressure, the driving force of the throttle valve control section is significantly increased, and a good acceleration state without acceleration delay can be obtained. On the other hand, when no signal is output from the high load state detection section, that is,
When the load is low or medium, the automatic transmission will not be downshifted even if the speed increase signal generating section is operated, and the throttle valve control section will open the throttle valve based on the negative pressure introduced into the intake pipe. Continuously increase the degree. In this way, under low or medium load conditions where intake pipe negative pressure sufficient to fully open the throttle valve is introduced into the throttle valve control section, the automatic transmission is not downshifted, so the driving force of the throttle valve control section is significantly reduced. Excessive acceleration due to this increase is prevented, and a good acceleration state can be obtained.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of a preferred embodiment of the present invention.

In the figure, in order to obtain information on the vehicle speed when the vehicle is running at a constant speed, a vehicle speed signal generating section 2 is provided that outputs a signal corresponding to the vehicle speed.

The vehicle speed signal generator 2 includes a reed switch 4, a permanent magnet 6, and a frequency-voltage conversion circuit 8, and can output a signal according to the vehicle speed. That is, when the reed switch 4 is turned on and off as the permanent magnet 6 rotates by the speedometer cable, a pulse signal having a frequency proportional to the vehicle speed is supplied to the frequency-voltage conversion circuit 8. This pulse signal is converted by the frequency-voltage conversion circuit 8 into a DC voltage having a level proportional to the vehicle speed.

This DC voltage is supplied to an analog switch 10 and a vehicle speed comparator 12.

Further, a set switch 14 is provided as a constant speed running command section for instructing the vehicle to run at a constant speed.

The set switch 14 is a switch operated by the driver when driving at a constant speed, and outputs a logic "0" level signal when the switch is operated, and a logic "0" level signal when the switch operation is released. 1” level signal is output. The output signal of the set switch 14 is sent to the inverter 16 and the OR circuit 1.
The signal is supplied to the analog switch 10 and the self-holding circuit 20 via the analog switch 8.

Then, when the set switch 14 is operated,
The self-holding circuit 20 is set and self-holding.

The self-holding circuit 20 is composed of, for example, a flip-flop, and holds itself when a set operation is performed by the set switch 14, and during that time, the output signal is sent to the drive circuit 24 of the throttle valve control section 22.
It is supplied to the AND circuit 26.

Further, the analog switch 10 is turned on when the set switch 14 is operated, and turned off when the switch operation is released. Therefore, when the set switch 14 is operated, the output signal of the frequency-voltage conversion circuit 8 is supplied to the storage circuit 28. This comparison circuit 28 includes an analog switch 1
The value immediately before 0 is turned off is stored as the vehicle speed setting voltage during constant speed driving. This memory circuit 28
is composed of, for example, a capacitor, and maintains the voltage held in the capacitor as a voltage corresponding to the vehicle speed. The output voltage of this memory circuit 28 is supplied to the vehicle speed comparator 12.

The vehicle speed comparator 12 is constituted by a comparator circuit, and compares the output voltage of the frequency-voltage conversion circuit 8 with the output voltage of the memory circuit 28, and outputs a signal according to the comparison value. When the output voltage of the vehicle speed signal generator 2 is higher than the set voltage set by the set switch 14, the energization time of the throttle valve controller 22 is shortened, and vice versa. In this case, a pulse signal of "1" and "0" is used according to the duty ratio so that the energization time becomes longer.

The output signal of the vehicle speed comparator 12 is supplied to the AND circuit 26 via the OR circuit 30. AND circuit 26
The output signal of the vehicle speed comparator 12 is applied to the drive circuit 3 only while the output of the self-holding circuit 20 is at the logic "1" level.
Supply to 2.

The throttle valve control section 22 includes a drive circuit 24,
An actuator 34 for controlling the opening degree of a throttle valve (not shown) based on an output signal from the controller 32.
is provided. This actuator 34 is composed of a control valve 34a, a release valve 34b, etc.
The opening degree of the throttle valve can be controlled by the output signals of the drive circuits 24 and 32. That is, when the drive circuit 32 is energized, the atmospheric pressure from the port 34c is cut off, and the intake pipe negative pressure is introduced into the chamber 34e from the port 34d. On the other hand, when the power supply to the drive circuit 32 is cut off, the intake pipe negative pressure from the port 34d is cut off, and the atmospheric pressure from the port 34c is transferred to the chamber 3.
Introduced in 4e.

The ratio between atmospheric pressure from port 34c and intake pipe negative pressure from port 34d is determined by vehicle speed comparison section 12.
is controlled by the duty ratio of the output signal.

A self-holding circuit 20 is connected to the release valve 34b via a drive circuit 24, and the self-holding circuit 20
is set and the drive circuit 24 is energized. on the other hand,
When the self-holding circuit 20 is reset and the drive circuit 24 is de-energized, atmospheric pressure is introduced into the chamber 34e.

In this way, the pressure inside the chamber 34e is reduced to the drive circuit 2.
The diaphragm 34g is moved by being controlled by the output signals 4 and 32. Along with this movement, the rod 34h connected to the accelerator link (not shown) moves in its axial direction, and the opening degree of the throttle valve is controlled to maintain constant speed running of the vehicle. .

The self-holding circuit 20 also includes a stop lamp switch 3 that is turned on when the brake pedal is depressed.
6. When either the parking brake switch 38, which is turned on when the parking brake is activated, or the neutral start switch 40, which is turned on when the shift position of the automatic transmission is in the neutral position, is turned on. It will be reset. In this case, constant speed running of the vehicle is canceled.

Further, in this embodiment, as a speed increase signal generating section that outputs a speed increase signal (increase command) that outputs an increase command for canceling the maintained vehicle speed and continuously increasing the vehicle speed when the vehicle is running at a constant speed. An increase set switch 50 is provided. This increase set switch 50 is
This is a switch operated by the driver when the driver wants to cancel constant speed driving and continuously increase the vehicle speed.
When the switch is operated, a logic "0" level signal is output, and when the switch operation is released, a logic "1" level signal is output. The output of the set switch 50 is supplied via an inverter 52 to an OR circuit 18, an OR circuit 30, and an AND circuit 54.

When the increase set switch 50 is operated, the self-holding circuit 20 is set and self-holding. Also, increase set switch 50
When the increase set switch 50 is operated, the output of the OR circuit 30 is output as a signal corresponding to the operation of the increase set switch 50. That is, while the increase set switch 50 is operated, a signal with a duty ratio close to 100% is output from the OR circuit 30.
It is supplied to the AND circuit 26. Therefore, the throttle valve control section 22 is no longer controlled to run at a constant speed and is controlled based on the operation of the increase set switch 50. That is, control is performed to continuously increase the vehicle speed.

Further, a negative pressure switch 56 is provided as a high load state detection section to detect whether or not the engine is in a high load state. This negative pressure switch 56
The opening and closing of the valve is controlled by the negative pressure in the engine's intake manifold, and it is designed to turn on when the negative pressure is below a certain level. Therefore, when the engine enters a so-called high load state where the negative pressure in the intake manifold is below a predetermined value, a logic "0" signal is output, and a logic "1" signal is sent to the AND circuit 54 via the inverter 58. supply.

The output of the AND circuit 54 changes the gear of the automatic transmission to 1.
Shift-down circuit 60 for shifting down a gear
It is connected to the.

The downshift circuit 60 includes a relay 62 having a normally closed contact T62, a solenoid 64, a transistor 66 for driving the relay, a transmission control switch 68, a fuse 70, an ignition switch 72, a fusible link 74, and a battery 76. It is configured. The downshift circuit 60 is configured to shift down the automatic transmission by one gear when the solenoid 64 is de-energized. Therefore, when the increase set switch 50 is operated, if the engine is in a high load state, the gear can be downshifted by one gear.

That is, when the increase set switch 50 is operated and the engine negative pressure falls below a certain level, a signal is output from the AND circuit 54.
The transistor 66 is turned on, the relay 62 is activated, and the solenoid 64 is changed from an energized state to a de-energized state, so that the gear of the automatic transmission is shifted down by one gear. Note that at this time, if the gear of the automatic transmission is being driven at 4th speed, the gear is downshifted to 3rd speed.

With the above configuration, according to this embodiment, when the increase set switch is operated and a high load state of the engine is detected, the automatic transmission can be downshifted by one gear to increase the vehicle speed. can.

In addition, although an example of downshifting from 4th gear to 3rd gear has been described above, the present invention is not limited to this, and if the reduction ratio of the automatic transmission is controlled to be large. good.

As explained above, according to the present invention, when an increase command is output, the reduction ratio of the automatic transmission is increased only when the engine is in a high load state. Delay is prevented and good acceleration condition is obtained, and low,
This has the effect that transient acceleration due to an increase in the driving force of the negative pressure actuator in a medium load state is prevented and a good acceleration state can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a constant speed traveling device for a vehicle according to the present invention. 2... Vehicle speed signal generation section, 10... Analog switch, 12... Vehicle speed comparison section, 14... Set switch, 22... Throttle valve control section, 50... Increase set switch, 56... Negative pressure switch, 60 ...Shift down circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] A constant speed traveling device for a vehicle equipped with an automatic transmission, comprising: a vehicle speed signal generator that generates a signal according to the vehicle speed; and a vehicle speed signal generator that outputs a speed increase signal when operated. a storage circuit that stores, as a maintained vehicle speed, a signal generated from the vehicle speed signal generating section immediately before the output of the speed increase signal from the speed increase signal output section is stopped; a comparison circuit that compares the signal generated from the generator with the signal stored in the storage circuit; and a control circuit that increases or decreases the intake pipe negative pressure to be introduced based on the comparison result of the comparison circuit so that the vehicle speed becomes the maintained vehicle speed. The opening of the throttle valve is controlled by the intake pipe negative pressure introduced at a throttle valve control section that controls the opening degree of the throttle valve based on the intake pipe negative pressure introduced so as to increase; a high load state detection section that detects an engine high load state from the intake pipe negative pressure of the engine; A downshift that changes the engagement state of the gears of the automatic transmission so that a downshift is performed when a high engine load state is detected by the high load state detection section and a speed increase signal is output from the speed increase signal generation section. A constant speed traveling device for a vehicle, characterized in that it is provided with a circuit.