JPS5847248Y2 - Engine restart failure prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an engine restart failure prevention device.

For example, in summer, when the temperature inside the engine room increases after the engine is stopped, fuel percolation and vapor lock occur, resulting in failure to restart the engine.

The present invention provides a device for dealing with the above-mentioned problems, and will be described below with reference to the accompanying drawings.

In Figure 1, A is the air cleaner, C is the carburetor,
FT is a fuel tank, and FP is a fuel pump. When the ignition switch is turned on, the fuel pump (electromagnetic type) FP is driven, and the fuel in the tank FT is supplied to the float chamber of the carburetor C through the fuel supply pipe P1, and the remaining The fuel is configured to return to the tank FT through the return pipe P2, and a fuel circulation path is formed by the pipes Pi and P2.

P3 is an air vent pipe of the fuel tank FT, and vaporized fuel in the tank is sent from the pipe P3 to, for example, the clean side of the air cleaner A, and is supplied to the engine together with intake air when the engine is driven.

The above is a general fuel piping system configuration, but in the present invention, even after the ignition switch is turned off and the engine has stopped, if the engine coolant temperature is above a predetermined value, the fuel pump FP is automatically activated. Pl the fuel,
The pipes Pi, P2 are circulated in the circulation path of P2.
It is designed to prevent overheating of the fuel inside the tank, prevent percolation, and prevent the formation of paper locks.

Figure 2 shows the fuel pump drive circuit according to the present invention, where 1 is the power source (battery), 2 is the ignition switch, and 3 is the electromagnetic fuel pump. Inside, the fuel pump drive circuit from source i, ignition switch 2, and fuel pump 3 to ground is closed, fuel pump 3 is operated, and fuel is supplied to the carburetor float chamber and fuel is circulated.

4 is a radiator blower that blows air to the radiator section where engine cooling water is to be cooled in the engine cooling system;
The radiator blower 4 is controlled by a thermoswitch 5 that is turned on when the engine coolant temperature exceeds a predetermined value, and when the engine coolant temperature exceeds a predetermined value, the power supply 1,
The radiator floor drive circuit that connects the ignition switch 2, radiator blower 4, and thermoswitch 5 to ground is forced to blow air to the radiator to lower the engine coolant temperature and prevent engine overheating.When the engine coolant temperature is low, The thermo switch 5 is turned off, the radiator floor 4 is stopped, and overcooling of the engine can be prevented.

The present invention is based on the above radiator floor 4 and thermo switch 5.
etc. are normally equipped in automobiles with water-cooled engines, and focusing on the fact that the engine cooling water temperature detected by the thermo switch 5 corresponds to the engine temperature, the power supply 1 is installed as shown in the second diagram. In addition to the circuit from the power source 1 to the fuel pump 3 via the ignition switch 2, a circuit from the power supply 1 directly to the fuel pump 3 is provided, and both circuits are switched and controlled by the radiator blower control thermoswitch 5. It is characterized by the fact that

During engine operation with the ignition switch 2 turned on, when the engine cooling water temperature is low and the thermo switch 5 is turned off, the switch 6b of the relay 6 is in the state shown by the solid line, and the ignition switch is turned on. A pump 3Vc current flows through the pump 2, and when the temperature of the engine coolant rises and the thermo switch 5 is turned on, the radiator blower 4 is activated, and at the same time, a current flows through the relay coil 6a, and the relay switch 6b switches as shown by the dotted line to turn on the power supply. Current flows more directly to the pump 3, and as a result, while the engine is running, the switching operation of the relay 6 is performed, but the fuel pump 3
continues to drive.

After the engine is stopped (after the ignition switch 2 is turned off), if the engine coolant temperature is higher than the predetermined value and the thermo switch 5 is on, the radiator floor 4 will not operate, but the switch 6b of the relay 6 will be activated as indicated by the dotted line. Therefore, the fuel pump 3 is driven to supply the first fuel.
The fuel is circulated from the fuel supply pipe P1 to the return pipe P2 in the figure to prevent overheating of the fuel in the pipe due to engine heat and the resulting occurrence of percolation, vapor lock, etc., thereby preventing engine restart failure.

When the engine temperature decreases, the engine coolant temperature also decreases, the thermo switch 5 is turned off, the switch 6b of the relay 6 is switched as shown by the solid line, and the fuel pump 3 is stopped.

As described above, according to the present invention, the thermo switch for controlling the drive of the radiator blower, which is normally installed in the engine cooling system of automobiles with water-cooled engines, is used, and the drive of the fuel pump is controlled by the thermo switch. With this configuration, it is possible to prevent percolation and vapor lock caused by overheating of the fuel without adding a new temperature sensor, etc., and the desired purpose can be achieved with a simple structure and low cost.Practical effect It is very much a dog.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a fuel piping system in an automobile, and FIG. 2 is a fuel pump drive circuit diagram showing an embodiment of the present invention. C...Carburetor, FT...Fuel tank? , FT...Fuel pump, Pl...
Fuel supply pipe, Pl...Return pipe, 1
...Power supply, 2...Ignition switch, 3...Fuel pump, 4...Radiator blower, 5...Thermo switch, 6.・
····relay.

Claims (1)

[Scope of utility model registration request] A circuit that connects directly from the power source to the fuel pump is added to the fuel pump 1 drive circuit that connects from the power source to the fuel pump via the ignition switch, and switching between the two circuits is activated by detecting the engine cooling water temperature in the engine cooling system. The radiator blower is operated by a controlled thermoswitch, and when the ignition switch is off and the engine is stopped and the engine coolant temperature is above a predetermined value, the fuel pump is activated to circulate fuel. Features a device to prevent engine restart failure.