JPS5815650Y2 - Warning device for forgetting to return Chiyo Clever - Google Patents

Description

[Detailed description of the invention] This invention relates to a choke lever forgetting to return warning device, which warns when the choke lever is pulled for warm-up and is forgotten to return even after warm-up is completed. At the same time, temperature control of loads such as air control valves for exhaust gas purification is also performed.

Vehicles such as automobiles are equipped with various devices, and when these devices do not operate or are malfunctioning,
A warning device consisting of a lighted or audible alarm is provided.

Conventionally, when installing multiple warning devices like this, each sensor and alarm were connected in series to a power source, but doing so caused the problem of complicating the circuit. Ta.

This invention is equipped with a choke switch that closes when the choke lever is pulled (when the choke valve is closed), and even if the engine temperature reaches a certain value, rich fuel is sent to the cylinder. This system not only warns of the current state, but also automatically performs the operation using a single circuit using the control 1 of the air control valve for exhaust gas purification, etc., which is provided independently of this.

Below, the diagrams will be explained as follows: 1. FIG. 1 shows an example of a conventional circuit, in which d is a battery mounted on a vehicle, the negative electrode of which is grounded to the vehicle body.

Ignition switch 2 is connected to the positive terminal of battery 1.
One end of a warning lamp 3, which is an alarm, is connected to one end of an exhaust gas purifying air control valve 4 (solenoid), which is a load.

The other end of the warning lamp 3 is connected via a choke switch 5, which closes when the choke lever is pulled, to one pole of a thermoswitch 6, which closes when the engine cooling water temperature reaches a certain value. .

The other pole of the thermoswitch 6 is grounded to the vehicle body.

The other end of the solenoid of the broken exhaust gas purifying air control valve 4 is grounded to the vehicle body via a thermoswitch 7 that opens when the engine cooling water temperature reaches a certain value.

In the conventional circuit configured in this way, the thermoswitch had to be fixedly installed at 2 f, which resulted in a problem of high cost.

FIG. 2 shows a circuit according to the present invention that solves this problem.

In this circuit, one pole of the choke switch 5 is connected to the negative pole of the battery 1 by grounding the vehicle body, and the other end is connected to a warning lamp 3 and a thermistor 8 having a positive temperature coefficient.
It is connected to the output side of the ignition switch 2 via.

One end of the exhaust gas purifying air control valve 4 is connected to the output side of the 4U ignition switch 2, and the other end is grounded to the vehicle body via a thermoswitch 6 that opens when the temperature of the engine cooling water reaches a certain value. .

Between the connection point between the thermostat 8 and the warning lamp 3, and the connection point between the solenoid of the exhaust gas purifying air control valve 4 and the thermoswitch 7, there is a connection point between the thermistor 8 side and the thermoswitch 7 side. A diode 9 is connected thereto.

31 and 4 show the characteristics of the thermistor 8 used in the circuit of FIG. 2.

That is, as shown in FIG. 3, this thermistor 8 is at a certain temperature T1-! shows a gentle temperature coefficient, and when the temperature exceeds T□, the resistance value rapidly increases from R1 at temperature T1 to R2 at temperature T2.

FIG. 4 shows how the resistor 8 self-heats due to the flowing current when a voltage higher than a certain value is applied, and the resistance value changes.

That is, the current increases as the voltage increases from R3 to a certain voltage E1, and then decreases as the resistance value increases due to self-heating toward voltage E2.

This circuit configured in this way operates as follows.

That is, when the engine is cold and the temperature of the cooling water has not reached a certain value, the thermo switch 6 is closed, so when the ignition switch 2 is closed, the current from the battery 1 is transferred to the exhaust gas purifying air control valve. There are two ways of flow: one flows from the thermoswitch 4 to the battery 1 (this controls the exhaust gas purifying air control valve 4), and the other flows from the thermistor 8 and diode 9 to the thermoswitch 6.
The thermistor 8 self-generates heat and stabilizes at a sufficiently high resistance value (R2 in FIG. 3).

As a result, the current flowing through the thermistor 8 is
Changes from ■2.

If the choke lever (not shown) is pulled in this state, the choke switch 5 will be closed, but the circuit between the choke switch 5 and the warning lamp 3 will be short-circuited by the thermoswitch 6 through the diode 9, causing the warning lamp to close. Lamp 3 will not light up.

Next, as the engine warms up and the temperature of the cooling water reaches a certain value (the set temperature of the thermoswitch 6), the thermoswitch 6 opens, and no current flows to the exhaust gas purifying air control valve 4.

In this state, if the choke switch 5 is closed by pulling the yoke lever, the warning lamp 3 lights up to notify the driver of this state.

In this state, only the warning lamp 3 is connected in series to the thermistor 8, so the current flowing through the thermistor 8 decreases, so the resistance value decreases, and the voltage applied across the warning lamp 3 decreases. will rise and the warning lamp 3 (ri) will light up brightly.

Since the present invention is constructed as described above, it not only warns when the choke lever that is pulled for warm-up operation is forgotten to return even after the warm-up is completed, but also reduces the load on the exhaust gas purifying air control valve, etc. Since temperature control can be easily carried out at the same time, it is advantageous in terms of installation space and cost.

Furthermore, when the warning lamp is turned on, the thermistor is connected in series with the warning lamp, so no rush current flows, which has the advantage of extending the life of the warning lamp.

By pulling the choke lever when the engine temperature is low, a warning lamp lights up, making it possible to check the operation of the thermo switch.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an example of a conventional choke lever forget-to-return warning device, Figure 2 is a circuit diagram of an embodiment of the present invention, and Figure 3 is the temperature of the thermistor used in the circuit in Figure 2. Graph showing the characteristics. FIG. 4 is a graph showing the relationship between the voltage and current of the thermistor buttoned in the circuit of FIG. 1... Battery 2... Ignition switch, 3... Warning lamp, 4...
・Air control palflo for exhaust gas purification...Thermo switch,...diode. 5...Choke switch, 8...Server star, 9...

Claims (3)

[Scope of utility model registration request] (1) A choke switch is provided that closes when the choke lever of the vehicle is pulled, and one end of the choke switch is connected to one pole of the power source, and the other end is connected to an alarm and a thermistor with a positive temperature coefficient. connected to the other pole of the power supply, while separately connecting a load between the two poles of the power supply;
A thermoswitch that opens when the engine cooling water temperature reaches a certain value is connected in series such that one pole of the thermoswitch is connected to a power supply in common with one pole of the choke switch, and A choke lever characterized in that a diode whose forward direction is from the thermistor side to the thermoswitch side is connected between the connection point between the thermostat and the alarm and the connection point between the load and the thermoswitch. A warning device for forgetting to put it back. (2) A device for warning of forgetting to return a choke lever according to claim 1, wherein the alarm is a warning lamp. (3) The choke lever forget-to-return warning device according to claim 1, wherein the load is an air control valve for purifying exhaust gas.