JPH0731282Y2 - Voltage signal input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a voltage signal input device suitable for an auto cruising mechanism of an automobile.

(Prior Art) The third example of the conventional input device of the auto cruising mechanism is
As shown in the figure.

In FIG. 3, 12 is a first ON-OFF switch for cancellation, 13 is a second ON-OFF switch for setting, 14 is a third ON-OFF switch for resume, and 15 is A / D conversion. , 16 is a receiving device such as a microcomputer, a is a DC power supply (5V) anode, c is a DC power supply cathode, that is, ground, 11 is a load resistance (100Ω), 17 is a second set resistance (47Ω) ), 18
Is a third resistor (270Ω) for resume.

The microcomputer 16 is connected to the anode a via the A / D converter 15, the input terminal b, and the load resistor 11.

A cancel switch 12 is provided between the input terminal b and the ground c.
A first circuit 19 having the following, a second circuit 20 having a set resistor 17 and a set switch 13 connected in series, and a third circuit 21 having a resume resistor 18 and a resume switch 14 connected in series. Are connected in parallel.

Then, when operating the auto cruising mechanism, the set switch 13 is turned on, when canceling the operation of the auto cruising mechanism, the cancel switch 12 is turned on, and when gradually increasing the speed set by the auto cruising mechanism, the resume switch 14 is turned on. .

When the vehicle is driven at a constant speed of 80 km / h, for example, the vehicle is accelerated and when the speed reaches 80 km / h, the set switch 13 is pressed to turn it on. Then, a 1.6 V set signal is input from the input terminal b to the microcomputer 16 via the A / D converter 15. Then, the actuator of the auto-cruising mechanism is driven by the output from the microcomputer 16, and the automobile thereafter automatically travels at a constant speed of 80 Km / h.

When turned on by pressing the cancel switch 13,
A cancel signal of 0V is input to the microcomputer 16 from the input terminal b, and the operation of the auto-cruising mechanism is released.

When turned on by pressing the resume switch 14,
A resume signal of 3.65V is input to the microcomputer 16 from the input terminal b, and the speed set by the auto-cruising mechanism gradually increases.

(Problems to be Solved by the Invention) In the above conventional input device, the cancel switch 12
If both the set switch 13 and the cancel switch 12 are pressed simultaneously and the cancel switch 12 and the resume switch 14 are pressed at the same time, a 0V cancel signal is input to the microcomputer 16, so the microcomputer 16 does not malfunction, but the set When switch 13 and resume switch 14 are pressed simultaneously, 1.
A voltage signal of 43V is input to the microcomputer 16. in this case,
The microcomputer 16 is 1.6V when only the set switch 13 is pressed.
Set signal and resume switch 14 and set switch
Since it cannot be distinguished from the voltage signal of 1.43V when 13 are pressed at the same time, the microcomputer 16 might misidentify it as a set signal.

In order to solve the above problems, the A / D converter 15 should have high discriminating ability, but the A / D converter with high discriminating ability 1
5 is expensive and has a problem that the microcomputer 16 malfunctions due to noise or the like caused by other causes.

(Means for Solving the Problems) The present invention has been proposed to solve the above problems, and its gist is to control the operation by the output from the receiving device connected to the anode of the power supply. The electronic control device is provided, and the input terminal and the cathode of the power supply are short-circuited between one input terminal of the receiving device and the cathode of the power supply to operate the electronic control device. A first circuit for interposing a first ON-OFF switch for canceling, a second resistor and a second ON-OFF switch for operating the electronic control unit are connected in series. And a third circuit in which a third resistor and a third ON-OFF switch for adjusting the operating state of the electronic control unit are connected in series. In a voltage signal input device, one terminal One of the terminals of the electronic device that allows only the flow of current from the terminal to the other terminal side is connected between the second resistance of the second circuit and the second ON-OFF switch, and either The other terminal is connected between the third resistor of the third circuit and the third ON-OFF switch, and the second terminal and the third ON-OFF switch are turned ON at the same time. The current passing through either one of the second or third ON-OFF switches passes through the electronic device and passes through the other ON-OFF switch, and between the input terminal and the cathode of the power source. In the voltage signal input device, the second and third circuits are configured so as to be short-circuited.

(Operation) Since the present invention has the above-mentioned configuration, if
The second and third ON-OFF switches are turned on at the same time due to an erroneous operation.
Only when set to N, the current passing through one of the ON-OFF switches of the second and third ON-OFF switches flows through the electronic device and the other ON-OFF switch, and the receiving device Since the input terminal of and the cathode of the power supply are short-circuited, the operation of the electronic control unit is canceled. However, both or one of the second and third ON-OFF switches is turned on.
When set to FF, no current flows through the electronic device.

(Embodiment) A first embodiment of the present invention is shown in FIG.

In FIG. 1, the third circuit 21, a third ON-OFF switch, that is, a third resistor, that is, a resume resistor 18, is connected to the downstream side of the resume switch 14. Reference numeral 22 denotes an electronic device such as a diode, which can flow a current to the cathode 22b only when a positive voltage is applied to the anode 22a. The anode 22a of this diode 22 is connected between the resume switch 14 and the resume resistor 18 of the third circuit 21, and the cathode 22b is the second resistor of the second circuit 20, namely the set resistor 17 and the second resistor. It is connected between the ON-OFF switch, that is, the set switch 13.

Other configurations are similar to those of the conventional one shown in FIG. 3, and corresponding members are designated by the same reference numerals.

Then, when the set switch 13 and the resume switch 14 are pressed at the same time, a current flows from the anode a of the power source to the cathode c of the power source through the resume switch 14, the diode 22 and the set switch 13. However, when both or either of the set switch 13 and the resume switch 14 are OFF, no current flows through the diode 22.

A second embodiment of the present invention is shown in FIG.

In the second embodiment, the set resistor 17 is connected to the downstream side of the set switch 13, the anode 22a of the diode 22 is connected between the set switch 13 and the set resistor 17 of the second circuit 20, and the cathode 22b is connected between the resume switch 14 and the resume resistor 18 of the third circuit 21.

Then, when the set switch 13 and the resume switch 14 are pressed at the same time, the current from the anode a of the power source is set switch.
It flows to the cathode c of the power source through the diode 13, the diode 22 and the resume switch 14.

(Effect of device) In the present invention, the second and third ON-OFs are erroneously operated due to erroneous operation.
Only when the F switches are turned on at the same time, the current passing through one of the second and third ON-OFF switches passes through the electronic device and the other turns on.
The operation of the electronic control unit is canceled because the input terminal of the receiving device and the cathode of the power supply are short-circuited by flowing through the OFF switch.

Then, when the first and second ON-OFF switches are simultaneously operated and when the first and third ON-OFF switches are simultaneously operated, the first circuit causes the input terminal of the receiving device and the cathode of the power source to operate. The voltage supplied to the receiving device is similar to the case where only the first ON-OFF switch for canceling is operated because of the short circuit between the receiving device and the receiving device. It is possible to prevent the occurrence of the occurrence, and it is possible to reliably cancel the operation of the electronic control unit when the ON-OFF switch is erroneously operated in an attempt to cancel the operation of the electronic control unit.

As a result, when any two ON-OFF switches among the first to third ON-OFF switches are simultaneously operated, the operation of the electronic control unit is always canceled.
It can improve its safety.

[Brief description of drawings]

1 is a wiring diagram showing a first embodiment of the present invention, FIG. 2 is a wiring diagram showing a second embodiment of the present invention, and FIG. 3 is a wiring diagram showing an example of a conventional input device. is there. Anode of power source …… a, cathode of power source …… c, receiving device …… 1
6, input terminal …… b, first ON-OFF switch …… 12, first circuit …… 19, second resistor …… 17, second ON-OFF switch …… 13, second circuit ...... 20, third resistance …… 18,
Third ON-OFF switch …… 14, third circuit …… 21, electronic device …… 22, anode …… 22a, cathode …… 22b

Claims (1)

[Scope of utility model registration request] 1. An electronic control device, the operation of which is controlled by an output from a receiving device connected to an anode of a power supply, and wherein the electronic control device is provided between one input terminal of the receiving device and a cathode of the power supply. A first circuit including a first ON-OFF switch for canceling the operation of the electronic control unit by short-circuiting the input terminal and the cathode of the power source, a second resistor and the above Second for operating the electronic control unit
A second circuit in which the ON-OFF switches of are connected in series and a third resistor and a third ON-OFF switch for adjusting the operating state of the electronic control unit are connected in series. In the voltage signal input device in which the three circuits are connected in parallel, one of the terminals of the electronic device that allows only the flow of the current from one terminal side to the other terminal side is connected to the second terminal. Connected between the second resistance of the circuit and the second ON-OFF switch, and either of the other terminals is connected between the third resistance of the third circuit and the third ON-OFF switch. In addition, only when the second and third ON-OFF switches are turned ON at the same time, the current passing through one of the ON-OFF switches of the second and third ON-OFF switches is the electronic device. Via the other ON-OFF switch. An input device for a voltage signal, characterized in that the second and third circuits are configured so that the cathode of the source is short-circuited.