KR19980017750A - Exposure equipment - Google Patents

Abstract

The present invention relates to a gas leakage preventing device for LPG vehicle, the ignition switch 11, the crankshaft position sensor 12, the supplementary power supply 13 and the ignition coil (6) of the engine is connected, the ignition switch (11) When the crankshaft rotation signal of the crankshaft is received from the crankshaft position sensor 12 in the OFF state, the electronic control unit receives current from the supplemental power supply 13 and applies the ignition coil 6 to maintain the ignition state ( 10); And a fuel supply blocking means connected to the electronic control unit 10 and installed in the mixer 3 to block the LPG fuel supply from the fuel supply pipe 9 as soon as the ignition switch 11 is turned off. 20); characterized in that the exhaustion of the LPG remaining in the mixer when the engine stops to prevent leakage to the outside, as well as hermetically preserve the LPG in the fuel supply pipe to start the mixer and engine very quickly The engine can be restarted quickly by refueling.

Description

Gas leak prevention device for LPG vehicles.

The present invention relates to a gas leakage preventing device for LPG vehicles, and more particularly, to exhaust the LPG in the mixer when the LPG vehicle is turned off (OFF) to prevent the discharge to the outside and also quickly from the fuel supply line at the start It relates to a gas leak prevention device for LPG vehicles that can be supplied with fuel.

In general, engines of automobiles, particularly internal combustion engines powered by burning fuel, are classified into gasoline engines, LPG engines, and diesel engines.

The LPG (Liquified Petroleum Gas) engine is cheaper and more economical than gasoline fuel, and the mixture supplied in each cylinder is also in the gas state, so it contains less carbon monoxide in the exhaust gas, the combustion speed is slower than gasoline, the octane number is relatively high, and the knocking ( It is widely used in commercial vehicles and taxis because of its relatively low knocking.

FIG. 1 schematically shows a LPG feedback system of such a general LPG vehicle.

According to FIG. 1, a typical LPG vehicle includes a vaporizer 1 for receiving and vaporizing LPG through a preheater from an unillustrated fuel cylinder (tank), and an air cleaner 2 for vaporizing LPG vaporized from the vaporizer. Mixer (3) for mixing with the suction air sucked through, and the engine (4) is operated by receiving and burning the fuel gas mixed in a suitable state from the mixer (3). Of course, not only these components but also various essential components such as, for example, a throttle valve 5, an ignition coil 6, a main adjustment screw 7, a crankshaft position sensor 8, and the like, are of course installed. Such general components and their functions are well known and thus detailed descriptions are omitted for clarity.

However, in this general LPG feedback system, LPG is released to the outside during start-up, causing air pollution.

In particular, the LPG remaining in the fuel pipe 9 for supplying the LPG from the vaporizer 1 to the mixer 3 and the LPG present in the mixer 3 at the start stop are leaked to the outside through the air cleaner 2. There was usually a problem of polluting.

Recently, a method of blocking fuel supply pipes by installing fuel supply blocking means in the vaporizer has been proposed. However, since fuel is exhausted in the fuel supply pipes, the fuel supply is delayed when the engine is restarted. There was a problem.

Therefore, the present invention has been made to solve such a problem, an object of the present invention is to exhaust the LPG remaining in the mixer in the start-off (OFF) LPG for preventing the LPG from leaking into the atmosphere through the air cleaner To provide a gas leak prevention device for vehicles.

Another object of the present invention is to provide an LPG vehicle gas leak prevention apparatus for achieving a fast fuel supply and starting by keeping the LPG closed in the fuel supply pipe.

1 is a schematic view showing a general LPG feedback system.

Figure 2 is a block diagram showing the configuration of a gas leak prevention apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: Vaporizer 2: Air Cleaner

3: mixer 4: engine

5: Throttle Valve 6: Ignition Coil

7: Main adjustment screw 8, 12: Crankshaft position sensor

9: fuel supply line 10: electronic control unit

11: Ignition switch 13: Supplementary power supply

20: fuel supply cutoff means

These objects are achieved by a preferred embodiment of the present invention. According to one aspect of the present invention, the ignition coil, the crankshaft position sensor and the supplementary power source and the ignition coil of the engine are connected, and the ignition switch is turned off. An electronic control unit which receives an electric current from the supplementary power source and applies the current to the ignition coil to maintain the ignition state when the rotation signal of the crankshaft is received from the shaft position sensor; And a fuel supply blocking means connected to the electronic control unit and installed in the mixer, the fuel supply blocking means for shutting off the LPG fuel supply from the fuel supply pipe immediately after the ignition switch is turned off. .

According to another aspect of the invention, the fuel supply blocking means is formed by a solenoid valve, the ignition coil is characterized in that the ignition state is maintained continuously until no signal is transmitted from the crankshaft position sensor to the electronic control unit LPG vehicle gas leak prevention devices are provided.

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

2 is a block diagram of a gas leakage preventing device for LPG vehicle according to the present invention.

According to FIG. 2, the gas leak prevention apparatus according to the present invention is connected to an ignition switch 11, an electronic control unit (ECU) 10 connected to a crankshaft position sensor 12, and the fuel supply pipe 9 described above. And a fuel supply blocking means 20 installed in the mixer 3.

In more detail, the electronic control unit 10 is connected to the ignition switch 11 to detect whether the start-up (ON / OFF), and the electronic control unit 10 also has a crank shift position sensor ( 12) is connected to receive the actual rotation or stop signal of the crankshaft.

In particular, the electronic control unit 10 is connected to a back-up power source 13 so that the engine 4 is still driven from the crankshaft position valve even when the ignition switch 11 is turned off, Upon receiving a signal indicating that it is rotating, the electronic control unit 10 receives current from the supplemental power source 13 and continues to supply current to the ignition coil 6, whereby the ignition coil 6 continues to ignite. Maintain state.

In addition, the electronic control unit 10 is connected to the fuel supply blocking means 20 for cutting off the fuel supply to the mixer (3). The blocking means 20 is preferably formed of a solenoid valve.

In more detail, the shut-off means 20 is turned off by the control unit 10 as soon as the ignition switch 11 is turned off to the mixer 3 through the fuel supply pipe 9. Shut off the fuel supply.

In the operation of the LPG vehicle gas leak prevention apparatus according to the present invention, the ignition switch 11 is turned off when the driver first removes the key from the ignition key holder to stop the engine. The state is transmitted to the electronic control unit 10. However, even if such ignition switch 11 is off, the engine is still driven and receives crank shaft rotation from crankshaft position sensor 12 as the crankshaft is rotated.

When these two signals, that is, the ignition switch off signal and the crankshaft rotation signal are transmitted to the electronic control unit 10, the electronic control unit receives power from the supplemental power source 13 and applies it to the ignition coil 6. While maintaining the ignition coil continuously in the ignition state, in particular, the fuel supply shutoff means 20 is turned off to cut off the fuel supply from the fuel supply pipe 9. Of course, it is understood that the interruption of the fuel supply to the mixer 3 by the blocking means 20 is performed simultaneously with the ignition switch 11 being turned off.

Accordingly, the LPG supplied from the vaporizer 1 to the mixer 3 is completely shut off, and the LPG already supplied to the mixer 3 is exhausted from the engine by the ignition coil 6 maintaining the ignition state. At this time, LPG supplied from the vaporizer 1 is present in the fuel supply pipe 9.

Thereafter, if the crankshaft position sensor 12 detects that the crankshaft is no longer rotated and no further rotation signal is transmitted to the electronic control unit 10, the electronic control unit 10 is connected to the ignition coil 6. No more power Accordingly, the engine is completely stopped, and the locking means 20 still blocks the fuel supply of the mixer 3 through the fuel supply pipe 9 so that there is almost no LPG in the mixer 3. Then, when the driver turns on the ignition switch 11 with the start key to drive, the shutoff means 20 is opened and the LPG already supplied to the fuel supply pipe 9 is supplied into the mixer 3. It will start quickly.

As a result, if the gas leak prevention apparatus according to the present invention is applied to the LPG feedback system of the LPG vehicle, LPG evaporated gas generated when the engine is stopped of the vehicle can be completely prevented from leaking to the outside and contaminating the air. The LPG can be fed to the mixer and engine quickly, which starts up very quickly.

Although a preferred embodiment according to the present invention has been described above, it will be understood by those skilled in the art that various modifications and changes can be made without departing from the scope of the appended utility model claims.

Claims (2)

The crankshaft position sensor 12 is connected to the ignition switch 11, the crankshaft position sensor 12, the supplemental power supply 13, and the ignition coil 6 of the engine, and the ignition switch 11 is turned off. An electronic control unit 10 receiving a current from the supplemental power source 13 and applying the current to the ignition coil 6 to maintain the ignition state when the rotation signal of the crankshaft is received; And Fuel supply blocking means 20 which is connected to the electronic control unit 10 and installed in the mixer 3 and blocks the LPG fuel supply from the fuel supply pipe 9 as soon as the ignition switch 11 is turned off. LPG vehicle gas leakage prevention device comprising a. 2. The fuel supply blocking means (20) according to claim 1, wherein the fuel supply blocking means (20) is formed of a solenoid valve, and the ignition coil (6) until no signal is transmitted from the crankshaft position sensor (12) to the electronic control unit (10). LPG vehicle gas leak prevention device characterized in that the ignition state is maintained continuously.