JPH0421000Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a regulator for an LPG fueled engine, and more particularly to improving the startability of an LPG fueled engine at low temperatures.

BACKGROUND TECHNOLOGY In general, in an LPG fuel engine, when the key switch 1 is turned on and the solenoid valve 2 is opened, as shown in FIG.
LPG fuel passes through filter 4 to regulator 5
enters, is depressurized in the regulator 5 and vaporized,
The fuel is configured to be absorbed into the engine 7 via the fuel passage 11 and the carburetor 6.

Cooling water is supplied to the engine 7 in the regulator 5.
The cooling water flows from the cooling water through the cooling water passage 8. Furthermore, as the cooling water passes through the cooling water passage 8A in the regulator 5 shown in FIG. 4, the LPG fuel that has flowed into the primary decompression chamber 9 is depressurized while taking vaporization heat from the cooling water, and the LPG fuel is turned into a liquid state. The cooling water changes into a gaseous state and flows from the carburetor 6 to the engine 7 through the slow passage 10, and then flows back into the engine 7 side through the cooling water passage 8B.

Problems that the invention aims to solve In the above-mentioned conventional LPG-fueled engine, when starting at low temperatures, the cooling water in the regulator is at a low temperature, so the LPG fuel cannot sufficiently absorb vaporization heat from the cooling water in the primary depressurization chamber, resulting in a liquid state. The fuel then flows into the engine, causing the engine to stall due to LPG fuel supercharging. In addition, icing occurs due to the attempt to further remove vaporization heat from the low-temperature cooling water, causing the problem that the inside of the regulator becomes stuck and does not function properly.

The object of the present invention is to solve the above-mentioned problems of conventional regulators, and to provide a regulator with a built-in heating wire for LPG low-temperature starting, which is compact, and enables reliable engine starting.

Means for Solving the Problems In an LPG fuel engine vehicle equipped with a regulator for vaporizing liquid LPG fuel and supplying it to the engine, the engine is equipped with a water temperature sensor that detects the engine cooling water temperature. In addition, a cooling water passage through which cooling water for imparting vaporization heat flows, and a heating wire disposed along the cooling water passage are provided inside the regulator, and the cooling water detected by the water temperature sensor is provided. A means for solving the problem is a regulator with a built-in heating wire for LPG low-temperature starting, which has a circuit that energizes the heating wire when the water temperature is below a set temperature.

Effect When an LPG specification engine starts at low temperature, LPG fuel absorbs vaporization heat from the heating wire inside the regulator, changing from liquid to gaseous state. When the cooling water reaches the set temperature, the electrical connection between the battery and the heating wire is cut off.
LPG fuel is converted into a gas by removing the heat of vaporization from the cooling water.

Embodiments Hereinafter, illustrated embodiments embodying the present invention will be described in detail. As shown in Figures 1 and 2
In a regulator 12 that supplies LPG fuel to an engine 18 that uses LPG fuel, an annular passage 14 is provided on the outer periphery of a cooling water passage 13 provided annularly within the body 12A of the regulator 12.
is provided. A heating wire 15 is provided in the passage 14.
is arranged, and one end of the heating wire 15 is connected to the battery 1.
The other end is connected to the ignition circuit of the key switch 16 connected to the engine 7, and the other end is connected to a water temperature sensor 19 that detects the temperature of the cooling water inside the engine 18. The water temperature sensor 19 is installed in a cooling water tank (not shown), and changes the temperature in the circuit depending on the set temperature.
ON-OFF control is performed.

The operation of the present invention configured as above will be explained in detail below.

When the key switch 16 is turned on to start the LPG fuel specification engine 18, liquid LPG fuel is introduced from the LPG fuel tank (not shown) into the chamber 29 in the regulator 12, and the LPG fuel is illustrated by its own pressure. The face valve 20 is pushed open and the water is sent to the primary decompression chamber 21 and slow passage 22 side. At this time, the LPG fuel is depressurized and vaporized by sufficiently removing vaporization heat from the heating wire 15. and
The diaphragm 24 pushes the regulator spring 25 due to the pressure of the LPG fuel, and the diaphragm hook 26 operates the valve lever 27.
By closing the illustrated face valve 20, the amount of LPG fuel is kept constant.

When the key switch 16 is turned to START, the slow lock diaphragm 28 is locked off, and the vaporized LPG fuel is supplied to the carburetor (not shown) through the slow passage 22, and the engine 18 receives an initial explosion to start the engine. After that, when the cooling water of the engine 18 becomes sufficiently warm and reaches the set temperature or higher, the water temperature sensor 19 detects it and the heating wire 15 and battery 17
cut off the conduction.

Effects of the invention As described above, in this invention, a heating wire is installed along the cooling channel inside the regulator of an LPG specification engine, which is said to have poor startability at low temperatures.
The entire device can be configured compactly, and
By giving sufficient heat of vaporization to the LPG fuel, it is possible to send a stable and appropriate amount of LPG fuel to the carburetor, which improves engine startability without causing the engine to stall due to too much LPG fuel. be able to. Further, since the conduction between the heating wire and the battery is controlled by the water temperature sensor, there is also the effect that the regulator is not heated and power is not wasted.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a regulator showing an embodiment of the present invention, Fig. 2 is a circuit diagram of an implementation of the invention, Fig. 3 is a diagram showing a conventional LPG fuel specification engine system, and Fig. 4 is the regulator. FIG. 12...regulator, 13...cooling water passage,
15... Heating wire, 18... Engine, 19... Water temperature sensor.

Claims (1)

[Scope of utility model registration request] In an LPG fuel engine vehicle equipped with a regulator for vaporizing liquid LPG fuel and supplying it to the engine, the engine is equipped with a water temperature sensor that detects the engine cooling water temperature, and inside the regulator there is a water temperature sensor that detects the engine cooling water temperature. A cooling water passage through which cooling water for imparting heat of vaporization flows and a heating wire disposed along the cooling water passage are provided, and when the cooling water temperature detected by the water temperature sensor is below a set temperature. A regulator with a built-in heating wire for LPG low-temperature starting, which has a circuit for energizing the heating wire.