KR100394718B1 - Apparatus and method for preventing poor engine starting and stopping for LPG vehicles - Google Patents

Abstract

The present invention relates to a device for preventing engine starting failure and an off of a LPG vehicle, and a method thereof. In particular, a flow rate of a mixer secondary flow (Slow side), which is considered to be a major cause of starting performance failure and an engine start-off caused by an LPG vehicle, is considered. To improve, bypass the spare secondary solenoid valve currently connected to the secondary solenoid valve of the mixer to maintain the required secondary fuel volume, and store this error on the instrument board (On-Board) while storing the error code in the electronic control unit. The warning lamp is turned on.

Therefore, it is possible to prevent starting failure that may occur due to the fuel shortage of the secondary solenoid valve due to tar, etc., starting off during running, etc. Also, consumers need maintenance through a lamp that is turned on when the flow rate of the secondary solenoid valve is insufficient. It is possible to prevent a claim such as starting off while driving and to find a repair shop. Also, in the office (A / S), it is possible to complete the maintenance by the preliminary information by means of a lit lamp or an error code.

Description

Apparatus and method for preventing poor engine starting and stopping for LPG vehicles}

The present invention relates to a device for preventing engine start and failure of an LPG vehicle, and a method thereof. More specifically, the present invention relates to a fuel shortage of a second solenoid valve caused by a foreign material (eg, tar) contained in an LPG fuel. It is possible to prevent the LPG vehicle from starting poorly and starting off while driving.When the flow rate of the secondary solenoid valve is insufficient, the lamp (MIL) is turned on so that consumers can feel the need for maintenance and start the vehicle while driving. Claims such as off can be prevented in advance, and in the business office (A / S), it is possible to complete maintenance with preliminary information by lighting lamps or error codes, which prevents the recurrence of malicious claims to satisfy customers. will be.

In conventional LPG cars, fuel vaporized by the engine coolant in the vaporizer is supplied to the mixer by the main fuel and the slow fuel line by the engine negative pressure when the driver operates the accelerator pedal. Accordingly, the lean / rich signal of the oxygen sensor mounted on the exhaust system is transmitted to the electronic control unit, and the fuel amount is adjusted by the feedback control of the electronic control unit.

At this time, each fuel flow rate control is possible by duty control of the solenoid valve attached to the mixer by an electronic control unit.

On the other hand, there are many impurities present in the domestic LPG fuel, especially since tar and the like are deposited inside the secondary solenoid valve, the flow path is narrowed, so that the secondary fuel flow rate is supplied below the required flow rate. Due to the insufficient secondary fuel flow rate on the mixer side, the fuel supply becomes poor at the initial start, and thus, there is a problem in that the starting performance is poor, as well as the case of the manual transmission wave, such as intermittent start-off during running.

The present invention has been made to solve such a conventional problem, the engine start failure of the LPG vehicle due to the fuel shortage of the second (Slow) solenoid valve due to tar among the foreign matter contained in the LPG fuel, and starting off while running Phenomenon can be prevented, and when the flow rate of the secondary solenoid valve is insufficient, the lamp can help consumers to feel the need for maintenance and prevent claims such as starting off while driving. A / S) provides a device and method for preventing engine start failure and turn-off of LPG vehicles that can satisfy customers by preventing the recurrence of malicious claims by being able to be fully maintained by prior information based on lit lamps or error codes. The purpose is.

The purpose of the present invention described above is to provide a spare flow rate connected to the secondary solenoid valve of the mixer in order to improve the mixer secondary flow (slow side) flow rate deficiency, which is considered to be the main cause of the poor starting performance in the LPG vehicle and the starting off during driving. This can be accomplished by bypassing the secondary solenoid valve in order to maintain the required secondary fuel volume, and by storing the error code in the electronic control unit and turning on the warning lamp on the on-board.

Therefore, it is possible to prevent starting failure that may occur due to the fuel shortage of the secondary solenoid valve due to tar, etc., starting off during running, etc. Also, consumers need maintenance through a lamp that is turned on when the flow rate of the secondary solenoid valve is insufficient. It is possible to prevent the claims such as starting off while driving and to find a repair shop. Also, in the after-sales service, perfect maintenance is possible with preliminary information by a lit lamp or an error code.

1 is a block diagram of an apparatus of the present invention.

2 is a flowchart for explaining the method of the present invention.

Explanation of symbols on main parts of drawing

1: Electronic control unit 2: Slow cut solenoid valve

3: idle adjust screw motor 4: surge tank

5: mixer 6: main adjust screw motor

7: main duty solenoid

8: Extra Slow Duty Solenoid Valve

9: Stoke Slow Duty Solenoid Valve

10: Start Solenoid Valve

11: idle speed control actuator

13: flow sensor 14: bypass passage

15: warning lamp

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

1 shows a block diagram of an apparatus of the present invention, and FIG. 2 shows a flowchart for explaining an operation state of the apparatus of the present invention.

According to this, the apparatus of the present invention is provided with a slow cut solenoid valve 2 and an idle adjust screw motor 3 in which the driving is controlled by the electronic control unit 1 in the primary and secondary chambers, and the surge tank 4 is provided. The main adjust screw motor (6), the main duty solenoid (7), the extra slow duty solenoid valve (8) and the stoke slow duty solenoid valve which are controlled by the electronic control unit (1) are connected to the mixer (5). (9), the fuel supply apparatus of the LPG vehicle provided with the start solenoid valve 10, the idle speed control actuator 11, etc.,

The flow rate sensor 13 is respectively installed in the extra slow duty solenoid valve 8 and the stoke slow duty solenoid valve 9, and a bypass passage 14 is additionally installed therebetween, and the electronic control unit 1 Warning lamp 15 is installed at the output end of the head), and the two solenoid valves 8 and 9 and the warning lamp 15 are selectively selected as necessary by comparing the flow rate value with the reference value in the electronic control unit 1. It is characterized in that the opening and closing and turning on and off at the same time to store the error code.

On the other hand, the method of the present invention comprises the steps of initializing the electronic control unit 1 when the ignition is "on" and receiving an output signal such as a water temperature and a pressure sensor (not shown) and measuring an error value until the start is completed; Detecting whether the temperature of the coolant is above a predetermined temperature (X ° C; for example, 15 ° C) when the engine is started, and performing electronic control according to the gaseous fuel when the engine temperature is lower than the predetermined temperature; As a result of the above detection, when the temperature of the cooling water is equal to or higher than the predetermined temperature (X ° C; for example, 15 ° C), the flow rate value Q of the secondary extra slow duty solenoid valve 8 installed in the mixer 5 is read. Continuously detecting whether the neutral (N-stage) throttle trajectory is fully closed; Detecting whether the current flow rate value is larger than the specific flow rate Q1 required in the state if the neutral throttle track is totally closed as a result of the detection; In the fuel supply control method of the LPG vehicle comprising the step of performing a normal electronic control if the current flow rate value is larger than the specific flow rate (Q1) required in the state as detected above,

As a result of the above detection, if the flow rate value in the state where the neutral throttle trajectory is fully closed is smaller than the specific flow rate Q1 required in that state, the secondary stoke slow duty solenoid valve 9 is totally closed so that the extra fuel is second extra slow. Causing bypass to the duty solenoid valve 8 side and then detecting whether the current flow rate is greater than a predetermined value Q2;

As a result of the above detection, since the excess fuel is bypassed to the secondary extra slow duty solenoid valve 8 side, if the current flow rate is larger than the predetermined value Q2, normal electronic control is performed, but if it is smaller than the warning lamp 15 Lighting) and storing the error code of the state.

Referring to the operation and effect of the device and method of the present invention consisting of such a configuration and steps as follows.

First, in the present invention, in order to improve the start-off and the starting failure during driving due to the insufficient mixer flow rate generated in the LPG vehicle, the engine coolant temperature in which the liquid coolant temperature of the LPG vehicle is normally controlled is 15 ° C. or more. The flow sensor 13 is attached to the extra slow duty solenoid valve 8 and the stoke slow duty solenoid valve 9 of (5), respectively, and is judged by the electronic control unit 1 to idle (ie, gear neutral) and acceleration. When the amount of fuel detected through the flow sensor 13 in the pedal fully closed state is supplied smaller than the required specific flow rate "Q1", the second stoke slow duty solenoid valve 9 is completely closed in the electronic control unit 1. Thus, the closed stoke slow duty solenoid valve 9 and excess secondary fuel are passed through the bypass passage 14 to the extra slow duty solenoid valve 8 side. Bypass is replenished.

Therefore, the clean excess secondary fuel is secondary controlled by the extra slow duty solenoid valve 8, so that the required secondary fuel amount can be sufficiently maintained, so that starting poor and starting during driving may occur due to the fuel shortage of the secondary solenoid valve. The off phenomenon can be prevented in advance.

On the other hand, although the extra fuel is supplemented to the extra slow duty solenoid valve 8 through the bypass passage 14 as described above, even the extra slow duty solenoid valve 8 is caused by various contaminants in the LPG fuel. If the flow rate is sufficiently contaminated, that is, the current flow rate is less than the predetermined value Q2, the electronic control unit 1 automatically stores the error code related to the flow shortage and turns on the warning lamp 15 installed in the instrument panel.

Therefore, the consumer can see the lighting state of the warning lamp 15, which is turned on when the flow rate of the secondary solenoid valve is insufficient, feel the necessity of maintenance, and can find a repair shop, thereby preventing claims such as starting off while driving, In (A / S), complete maintenance can be performed with the prior information based on the lamp or the error code that is lit.

As described above, according to the present invention, the excess fuel is bypassed when the secondary solenoid valve runs out of fuel due to tar or the like, thereby preventing starting failure and starting off during driving. In addition, since the warning lamp is turned on when the flow rate of the secondary solenoid valve is insufficient, consumers can see the lighting status of the lamp and immediately find the repair shop, so that claims such as starting off while driving can be prevented. In (A / S), it is a very useful invention such that perfect maintenance can be performed through prior information by a lit lamp or an error code.

Claims (2)

The first and second chambers are provided with a slow cut solenoid valve 2 and an idle adjust screw motor 3 which are controlled by the electronic control unit 1 and connected to the surge tank 4. The main adjust screw motor 6, the main duty solenoid 7, the extra slow duty solenoid valve 8, the stoke slow duty solenoid valve 9, and the start solenoid valve which are controlled by the electronic control unit 1. In the fuel supply apparatus of the LPG vehicle provided with the 10 and the idle speed control actuator 11, The flow rate sensor 13 is respectively installed in the extra slow duty solenoid valve 8 and the stoke slow duty solenoid valve 9, and a bypass passage 14 is additionally installed therebetween, and the electronic control unit 1 Warning lamp 15 is installed at the output end of the head), and the two solenoid valves 8 and 9 and the warning lamp 15 are selectively selected as necessary by comparing the flow rate value with the reference value in the electronic control unit 1. Preventing the engine starting failure and off of the LPG vehicle, characterized in that the opening and closing and flashing at the same time to store the error code. Initializing the electronic control unit 1 when the ignition is "on", and receiving an output signal such as a water temperature and a pressure sensor (not shown) to measure an error value until the start is completed; Detecting whether the temperature of the coolant is above a predetermined temperature (X ° C.) when the engine is started, and performing electronic control according to the gaseous fuel if the temperature of the coolant is less than the predetermined temperature (X ° C.); As a result of the above detection, if the temperature of the cooling water is equal to or higher than the predetermined temperature (X ° C), the flow rate value Q of the secondary extra slow duty solenoid valve 8 installed in the mixer 5 is read and a neutral (N stage) throttle is read. Continuously detecting whether the trajectory is fully closed; Detecting whether the current flow rate value is larger than the specific flow rate Q1 required in the state if the neutral throttle track is totally closed as a result of the detection; In the fuel supply control method of the LPG vehicle comprising the step of performing a normal electronic control if the current flow rate value is larger than the specific flow rate (Q1) required in the state as detected above, As a result of the above detection, if the flow rate value in the state where the neutral throttle trajectory is fully closed is smaller than the specific flow rate Q1 required in that state, the secondary stoke slow duty solenoid valve 9 is totally closed so that the extra fuel is second extra slow. Causing bypass to the duty solenoid valve 8 side and then detecting whether the current flow rate is greater than a predetermined value Q2; As a result of the above detection, since the excess fuel is bypassed to the secondary extra slow duty solenoid valve 8 side, if the current flow rate is larger than the predetermined value Q2, normal electronic control is performed, but if it is smaller than the warning lamp 15 Lighting) and storing an error code of the state; and preventing the engine starting failure and the turning-off of the LPG vehicle.