KR20040015938A - heating apparatus for LPG engine - Google Patents

Abstract

PURPOSE: An auxiliary start apparatus is provided to allow the vehicle engine to smoothly start in winter time by pre-heating the residual gas in the mixer. CONSTITUTION: An auxiliary start apparatus comprises a mixer(130) for mixing an LPG and air; a hot wire(200) mounted on the mixer; a temperature sensor(210) for sensing the temperature of the mixer; a control unit for judging whether the temperature sensed by the temperature sensor is the vaporizing temperature of the LPG frozen in the mixer; a power unit electrically connected to the hot wire in accordance with the control of the control unit; and a lamp which turns on/off in accordance with the control of the control unit.

Description

Starting aid for gas fuel vehicle {heating apparatus for LPG engine}

The present invention relates to a starting aid for a gas fuel vehicle.

Vehicles that use liquefied petroleum gas (LPG) or compressed natural gas (LNG) as fuels have lower emissions of harmful gases and lower fuel consumption costs than those using gasoline or diesel. Recently, the use of such a gas fuel has been widely expanded.

However, in order to use such a gas fuel, a separate gas supply device must be provided in addition to the general fuel supply structure. Among these, a fuel supply system of a liquefied petroleum gas vehicle using LP gas as a fuel will be described with reference to FIG. 1. The LP gas is stored in a bombe (Bombe) 112, the high-pressure gas of about 4 kg / ㎠ about the liquid line or gaseous line from the cylinder 112 is the first of the vaporizer (Vaporizer 114) Enter the decompression chamber 116.

After the primary pressure was reduced to about 0.3 kg / cm 2 in the first pressure reducing chamber 116 of the vaporizer 114, the vaporizer was started through a start adjust screw 118 and a start solenoid valve 120. After entering the second pressure reducing chamber 122 of 114 and finally depressurizing to atmospheric pressure, it exits through the fuel cut solenoid V. 124 and the duty solenoid V. 126 side and the main. Branched to the main adjust screw (128) side, the fuel is supplied to the mixer 130 is mixed with air.

Here, the air amount is regulated through the throttle valve 132 in the mixer 130 during normal driving, and is controlled by the air adjust screw 134 and the idle up solenoid valve 136 during idling or starting.

The air passage amount is initially set in the air adjust screw 134, and the idle up solenoid valve 136 simply turns on / off the air.

However, in the conventional technology as described above, if the LLP switch is turned off after stopping during the cold winter season and the residual LLP of the fuel system is completely burned in the engine, there is no problem in restartability, but if the liquid LLP remains in the fuel system, There was a problem that the start does not occur due to blocking of the flow of gaseous LLP at the start of the next day because it is not vaporized by the atmospheric temperature (see Published Patent Publication No. 10-2002-54185).

That is, in the case of a vehicle using a conventional gas fuel, to prevent the freezing by preventing the injection of gas before the start-up and burning all of the gas in the combustion chamber, there is a problem that the start of the cold winter day does not take place due to freezing of residual fuel.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a starter assist device for a gas vehicle that can notify a driver whether a starter can be started in winter by installing a startable indicator on a dashboard of a vehicle using gas fuel. .

1 is a block diagram showing a conventional fuel supply system for a gas fuel vehicle

2 is a schematic representation of the invention

<Explanation of symbols for the main parts of the drawings>

E: Engine 130: Mixer

132 throttle valve 200 hot wire

210: temperature sensor ECU: control unit

L: Lamp

A start-up assistance device for a gas fuel vehicle of the present invention for achieving the above object includes a mixer in which gas fuel and air are mixed; A heating wire installed in the mixer; A temperature sensor for sensing a temperature inside the mixer; A control unit for determining whether the temperature detected by the temperature sensor is a vaporization temperature of the gas fuel frozen inside the mixer; A power supply unit electrically connected to the heating wire under control of the controller; It is configured to include a lamp that is turned on or off under the control of the control unit.

By the above configuration, when the temperature inside the mixer reaches a temperature capable of vaporizing the frozen gas fuel, the lamp can be turned on to indicate the startable state.

In addition, the starter auxiliary device for a gas fuel vehicle of the present invention is configured by providing the temperature sensor to the throttle valve.

With the above configuration, it is possible to accurately measure the temperature of the internal space of the mixer.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 schematically shows a starting aid device for a gas fuel vehicle of the present invention.

The same parts as in the prior art are omitted, and a description of the structure of the same parts as in the prior art is omitted.

As shown in FIG. 2, in the present invention, the heating wire 200 is wound in a spiral shape on the outer circumferential surface of the mixer 130. Of course, the structure installed in the inner peripheral surface of the mixer 130 can also be employ | adopted.

The mixer 130 is a space where gas fuel and air introduced into the engine E are mixed, and a throttle valve 132 is installed therein and a passage through which gas fuel and air are introduced is the same as in the prior art. .

The hot wire 200 is connected to a power supply unit (not shown), and serves to preheat the mixer 130 when electrically connected to the power supply unit under control of the control unit ECU.

When the heating wire 200 is heated, a temperature sensor 210 for measuring the temperature of the internal space of the mixer 130 is installed in the mixer 130. The temperature sensor 210 is preferably installed in the throttle valve 132.

The temperature value measured by the temperature sensor 210 is input to the control unit ECU.

The controller ECU determines whether the temperature inside the mixer 130 is a temperature at which the gas fuel frozen in the mixer 130 may be vaporized.

Lamp (L) is connected to the control unit ECU, the lamp (L) is preferably installed on the instrument panel of the vehicle.

The lamp L is turned on or off under the control of the control unit ECU.

Hereinafter, the operation of the present invention will be described.

When starting in winter, the engine can not be started in a state in which residual gas remaining inside the mixer 130 may be frozen. In this case, the control unit ECU receiving the preheating signal from a separate preheating switch (not shown) electrically connects the heating wire 200 and the power supply unit to preheat the mixer 130.

The temperature inside the mixer 130 is detected by the temperature sensor 210 and the detected value is sent to the control unit ECU. The control unit ECU checks whether the temperature inside the mixer 130 has reached a temperature at which the frozen gas can vaporize, and when it is determined that the temperature has been reached, turns on the lamp L provided in the instrument panel. In this case, of course, the control unit ECU may employ a configuration in which the preheat switch is returned to its original position.

Since the temperature sensor 210 is installed in the throttle valve 132, the temperature inside the mixer 130 can be measured more accurately than that provided in the throttle body, that is, the surface of the mixer 130.

The driver checks the lighting of the lamp L to confirm that the engine is in a startable state, and then starts the engine. The controller ECU may turn off the lamp L by detecting a state in which the engine is started, or turn off the lamp L after the lighting state of the lamp L continues for a predetermined time.

Since the start-up assistance device for a gas fuel vehicle of the present invention adopts a structure in which the mixer is preheated by a heating wire, it is possible to preheat it to a temperature capable of vaporizing frozen residual gas present in the mixer, thereby starting the vehicle in winter. It acts as a supplement.

In addition, in the present invention, when the temperature inside the mixer reaches a temperature capable of vaporizing the frozen residual gas, the driver can be notified of the startable state by turning on a lamp installed in the instrument panel, thereby smoothly starting in winter.

In addition, in the present invention, since the temperature sensor is installed on the rear surface of the throttle valve, it is possible to accurately measure the temperature of the internal space of the mixer.

Claims (2)

A mixer in which gas fuel and air are mixed; A heating wire installed in the mixer; A temperature sensor for sensing a temperature inside the mixer; A control unit for determining whether the temperature detected by the temperature sensor is a vaporization temperature of the gas fuel frozen inside the mixer; A power supply unit electrically connected to the heating wire under control of the controller; Starting aiding device for a gas fuel vehicle comprising a lamp that is turned on or off under the control of the controller. The method of claim 1, The temperature sensor is a starting aid for gas fuel vehicle, characterized in that installed on the throttle valve.