JPH0569014B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a constant speed traveling device for an automobile that can maintain the vehicle speed at a speed desired by the driver even if the driver takes his or her foot off the accelerator pedal.

[Conventional technology]

2. Description of the Related Art In recent years, some automobiles are equipped with constant speed driving devices in order to reduce the burden on drivers when driving at a constant speed on expressways and roads with good flow.
When this device is turned on, the throttle opening is automatically adjusted without the need to press the accelerator pedal, and the vehicle speed is maintained constant at the desired speed set by the driver.

As shown in FIG. 2, the constant speed driving device for automobiles generally includes a vehicle speed sensor (not shown), a control device that receives a vehicle speed information signal from the vehicle speed sensor, and controls all functions of constant speed driving using a microcomputer. 10, an actuator 3 that adjusts the throttle valve to a set opening degree based on a signal from the control device 10;
Main switch 2, which is the power switch for the constant speed running device, vehicle speed setting (set)/deceleration control (coast) switch 11, constant speed running return (resume)/acceleration control (accelerator) switch 12, and constant speed running cancellation (cancel) ) switch 13, various cancel switches 4 (stop lamp switch 4a, parking brake switch 4b, clutch switch 4c for M/T vehicles, A /T vehicle's neutral start switch 4d, etc.).

[Problem that the invention seeks to solve]

However, with conventional constant speed driving devices for automobiles,
A main switch 2, which is a power switch for the constant-speed running device, and a set switch 11, which is a control switch 1 that sets the vehicle speed for constant-speed running, are provided separately at separate locations. That is, the third
As shown in the figure, the main switch 2 is often installed on the instrument panel 9 of a car, and the set switch 11 is placed on the steering wheel 8 (Figure 2) or the combination switch at hand for easy operation. Often installed.

As a result, when the driver wants to drive at a constant speed, he must first turn on the main switch 2 at a distance, and then turn on the set switch 11 at hand to drive at a constant speed, which is inconvenient. In addition, the main switch 2
It has been considered to incorporate it into a combination switch at hand, but it has disadvantages such as lack of space and complicated wiring, so it is not necessarily practical.

[Means for solving problems]

An object of the present invention is to solve the problems of the conventional constant speed traveling device, to make the function of the power switch of the constant speed traveling device also function as a set switch in the driver's hand, and to set the constant speed by the first operation of the set switch. To provide an excellent constant speed traveling device for an automobile that can turn on the power of the traveling device and allow the set switch to perform its original setting operation after the second operation.

The constant speed device for an automobile of the present invention that achieves the above object is a constant speed driving device for a car that includes a power holding circuit connected to an ignition switch, a set switch, a logic circuit, and a constant speed driving control device, and includes the following: The power holding circuit keeps the control device energized when the set switch is turned on, and de-energizes the control device when the ignition switch is turned off, and the logic circuit turns on the ignition switch.
The set signal is not output when the set switch is turned on for the first time after the set switch is turned on, but the set signal is output when the set switch is turned on from the second time onwards.

[Effect]

In the constant speed driving device for automobiles of the present invention, when the set switch is pressed for the first time with the ignition switch ON, the constant speed driving control device is energized.
Even if you release the set switch, the energized state is maintained.
When the set switch is pressed again, constant speed driving can be performed by the constant speed driving control device. Also, when the ignition switch is turned off, power to the constant speed cruise control device is stopped, and when the ignition switch is turned off again.
Even if it is turned on, the constant speed cruise control device will not be energized unless the set switch is turned on.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the main parts of an embodiment of a constant speed running device for automobiles according to the present invention, and numeral 10 indicates a constant speed running control device that controls all functions of constant speed running. Some and various cancel switches, actuators, and sensors are omitted from this figure. In addition to this control device 10, what is shown in FIG. 1 is an ignition switch 2.
0, power supply holding circuit 30, set switch 40,
This is a logic circuit 60 having a function of setting an OR circuit 50 and a control circuit.

The power supply holding circuit 30 connected to the ignition switch 20 includes a transistor T ₁ , resistors R ₁ , R ₂ ,
and relay L, one terminal of relay L is connected to OR circuit 50, and the other terminal of relay L is connected to OR circuit 50, logic circuit 60,
and serves as the power supply line Vc of the control device 10. The OR circuit 50 includes a resistor R ₃ and a diode D ₁
~D Consists of ₄ . The logic circuit 60 includes seven NAND circuits _I1 to _I7 , a capacitor _C1 , and a resistor.
NAND circuits _I1 to I4 function as flip-flop F/F, and NAND circuits _I1 to _I4 function as flip-flop F/F.
I ₅ functions as an inverter, and NAND circuits I ₆ , I ₇
functions as an AND circuit as a whole. One input of the flip-flop F/F is connected to a node G between a capacitor _C1 and a resistor _R4 , and the other input is connected to a set switch ₄₀ via a diode D3. Further, the input of the NAND circuit _I5 is connected to the set switch 40 via the diode _D4 , and the output of the NAND circuit _I7 is connected to the set terminal S of the control device 10. E indicates a power terminal of the control device 10.

The operation of the automobile constant speed traveling device configured as above will be explained.

When the driver turns on the ignition switch 20 and the car is running, only the power supply holding circuit 30 is connected to the power supply B, but the relay L
is in the OFF state, the constant speed traveling device after the OR circuit 50 is not energized. When the driver turns on the set switch 40 installed on the steering wheel, for example, in order to drive at a constant speed, current flows through the resistors R ₁ and R ₂ through the diode D ₁ and turns on the transistor T ₁ . , As a result, relay L turns on.

When the relay 50 is turned ON, the power line Vc after the OR circuit 50 becomes 12V, and even if the set switch 40 is turned OFF in this state, the voltage of the power line Vc is maintained. Then, when the power supply line Vc becomes 12V, the logic circuit 60 is energized, and the power terminal E of the constant speed cruise control device 10 is also energized. This power line Vc is connected to the ignition switch 20.
Power is removed by turning OFF.

On the other hand, when the power supply line Vc is energized by turning on the set switch 40, a pulse signal is output from the connection point G by the capacitor _C1 and the resistor _R4 forming a differentiating circuit, and the input of the NAND circuit _I1 is brought to an instantaneous logic level. It becomes 1”. At this time, the input of the NAND circuit _I2 is at logic level "0". Therefore, the inverted output (output) of the flip-flop F/F becomes "0" and the output of the NAND circuit _I7 also becomes "0", so no set signal is input to the set terminal of the constant speed cruise control device 10. . Therefore, constant speed driving is not possible in this state.

The output of the node G becomes "0" immediately, but since the input of the NAND circuit _I2 is "0" at this time, there is no change in the output of the flip-flop F/F. The output of the connection point G remains "0" from then on.

When the driver takes his hand off the set switch 40 and turns it off, the input of the NAND circuit _I2, which is at high level when the input is open, becomes "1".
The flip-flop F/F is inverted and its output changes from "0" to "1". However, this time
Since the input of NAND circuit _I5 is also "1", its output is "0", and since one input of NAND circuit _I6 is "0", the output of NAND circuit _I7 is also "0", No set signal is input to the control circuit 10. The input of NAND circuit _I1 is “0” unless the ignition switch 20 is turned off.
It remains as it is. When the set switch 40 is pressed again and the inputs of the NAND circuits I ₂ and I ₅ change from "1" to "0", the output of the NAND circuit I ₇ becomes "1" and a set signal is input to the control circuit 10. Therefore, this state is the standby state of the set circuit 60.

During this standby state, when the driver presses the set switch 40 again to turn it on, the inputs of both the NAND circuits I ₂ and I ₅ become "0". In this state, both inputs of the flip-flop F/F are "0", so the output of the flip-flop F/F is not inverted and remains "1", and only the output of the NAND circuit _I5 changes from "0" to "0". 1”. As a result, both the inputs of the NAND circuit _I6 become "1", so the output of the NAND circuit _I7 also becomes "1",
A set signal is input to the control circuit 10, and the vehicle can start running at a constant speed at the time the set switch 40 was pressed.

In addition, if the driver turns the ignition switch 20
When turned OFF, relay L of power holding circuit 30 is turned off.
OFF, and the power supply to the power supply line Vc is released.
After this, the driver turns on the ignition switch 20.
Even if it is turned on, the constant speed cruise control device 10 will not be energized unless the set switch 40 is pressed.

Further, although this configuration has been explained using an analog circuit, it is clear that these configurations can be implemented using microcomputer software.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to eliminate the power switch of the vehicle's constant-speed running device and make it function as a set switch in the driver's hand. There is no need to operate a switch, and constant speed driving can be set at hand.Press the set switch once to energize the constant speed driving device, and press the same switch again to set constant speed driving, which is convenient. This has the effect of reducing the number of switches, resulting in advantages in terms of space and cost.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the main structure of an embodiment of a constant speed traveling device for an automobile according to the present invention, FIG. 2 is an explanatory diagram showing the components of a conventional constant speed traveling device for an automobile, and FIG. FIG. 2 is an explanatory diagram showing an example of the installation position of a main switch in a conventional device. 10... constant speed running control device, 20... ignition switch, 30... voltage holding circuit, 40...
...Set switch, 50...OR circuit, 60...
logic circuit.

Claims (1)

[Scope of Claims] 1. In a constant speed traveling device that maintains the speed of a vehicle at a constant speed using a constant speed traveling control device, the control device is connected to an ignition switch, and when the set switch is turned on, the control device is kept energized; Turning off the ignition switch
A power supply holding circuit that releases the power to the control device according to the above-mentioned configuration, and a power holding circuit that does not output a set signal when the set switch is turned on for the first time after the ignition switch is turned on, and outputs a set signal when the set switch is turned on from the second time onwards. A constant speed traveling device for an automobile, comprising a logic circuit.