KR20200068186A - evaporation gas active purge system and operating method for evaporation gas active purge system - Google Patents

Abstract

The present invention relates to a method for operating an evaporative gas active purge intake and exhaust system and an evaporative gas active purge intake and exhaust system, a canister adsorbing the evaporated gas generated in the fuel tank, and a bantraline connected to the canister to allow air to flow into the canister, It includes an adsorption line connecting the canister and the fuel tank, a purge line connecting the canister and the intake pipe, a purge pump provided in the purge line, and a purge valve provided in the purge line to be located between the purge pump and the intake pipe, and the canister Is, the air compartment connected to the bantraline, and located on one side of the air compartment, and includes an adsorption compartment connected to the adsorption line and the purge line, and a hydrocarbon concentration sensor is mounted on one side of the communication part communicating the air compartment and the adsorption compartment, Provided is a method for operating an evaporative gas active purge intake/exhaust system and an evaporative gas active purge intake/exhaust system that monitor the concentration of the evaporated gas collected in the canister through the concentration sensor even after the start is stopped.

Description

Evaporation gas active purge intake and exhaust system and evaporation gas active purge intake and exhaust system operation method {evaporation gas active purge system and operating method for evaporation gas active purge system}

The present invention relates to an evaporative gas active purge intake/exhaust system and a method for operating an evaporative gas active purge intake and exhaust system, and an evaporative gas active purge intake/exhaust system and an evaporative gas active purge intake/exhaust system that maintain a constant concentration of evaporation gas in a canister after engine stop It is about.

In response to changes in temperature and pressure inside the fuel tank, the fuel contained in the fuel tank evaporates. The boil-off gas inside the fuel tank can increase the internal pressure of the fuel tank more than necessary, and pollutes the atmosphere when leaking outside the fuel tank.

Accordingly, a canister for collecting evaporated gas is provided on one side of the fuel tank. The canister includes an adsorption compartment connected to a fuel tank and an intake pipe, and an air compartment provided to be connected to the atmosphere on one side of the adsorption compartment. As the evaporation gas is collected in the adsorption compartment, air is moved from the air compartment to the adsorption compartment due to a difference in air concentration in the air compartment.

In the case of a natural intake engine, the internal pressure of the intake pipe represents negative pressure by pumping the piston according to the rotation of the crankshaft. The negative pressure of the intake pipe acts on the canister connected to the intake pipe, and the evaporated gas collected in the canister moves to the intake pipe.

However, in the case of a turbocharged engine, since the intake pipe compresses the intake air, the intake pipe internal pressure is equal to or greater than the atmosphere. Therefore, the boil-off gas collected in the canister does not flow into the intake pipe, but rather, the intake air compressed in the intake pipe flows into the canister and there is room for leaking the boil-off gas.

In addition, in the case of a hybrid vehicle, since the engine operation amount is relatively small, since the amount of the evaporated gas transferred to the intake pipe is relatively small compared to the evaporated gas collected in the canister, there is a large room for leakage into the atmosphere.

In addition, there is a room for the vaporized gas collected in the canister to leak into the atmosphere when the vehicle is stopped.

Republic of Korea Patent Publication No. 10-1998-0038643 (1998.08.05.)

The object of the present invention, invented in view of the above, is a method for operating an evaporative gas active purge intake and exhaust system and an evaporative gas active purge intake and exhaust system that can smoothly supply evaporative gas adsorbed on a canister to an intake pipe even in a vehicle equipped with a turbocharger. Is to provide.

In addition, it is to provide a method for operating an evaporative gas active purge intake/exhaust system and an evaporative gas active purge intake/exhaust system capable of sufficiently supplying the evaporation gas collected in the canister to the intake pipe even if the engine operation is small.

In addition, it is to provide an evaporation gas active purge intake and exhaust system and a method for operating an evaporation gas active purge intake and exhaust system that can prevent the evaporation gas collected in the canister from leaking into the atmosphere even when the vehicle is stopped.

In order to achieve the above object, the evaporative gas active purge intake and exhaust system of an embodiment of the present invention, a canister adsorbing the evaporated gas generated in the fuel tank, a bantraline connected to the canister to allow air to flow into the canister, and a canister And an adsorption line connecting the fuel tank, a purge line connecting the canister and the intake pipe, a purge pump provided in the purge line, and a purge valve provided in the purge line to be positioned between the purge pump and the intake pipe, and the canister comprises , An air compartment connected to the bantraline, located on one side of the air compartment, and including an adsorption compartment connected to the adsorption line and the purge line, and equipped with a hydrocarbon concentration sensor on one side of the communication part communicating the air compartment and the adsorption compartment, The concentration of the evaporated gas collected in the canister is monitored through the concentration sensor even after the engine is stopped.

In addition, the engine connected to the intake pipe, the engine may further include a motor that provides a driving force separately from the engine in a driving wheel that provides power.

Further, the motor can be driven even after the engine is stopped.

In addition, a compressor may be mounted on the intake pipe to compress the air intake in the intake pipe.

In order to achieve the above object, the method of operating the evaporative gas active purge intake and exhaust system according to an embodiment of the present invention includes recording an engine signal connected to the intake pipe and simultaneously recording a first signal that is an electrical signal generated by the concentration sensor, and a concentration sensor. And comparing the second signal, which is the electrical signal generated in the first signal, and operating the purge pump when the second signal is larger than the first signal.

In addition, in the step of operating the purge pump, the purge pump is driven for 10 seconds, the purge valve may remain open.

In addition, after performing the step of operating the purge pump, the step of comparing the second signal with the first signal may be repeatedly performed.

Further, the method further includes determining whether 48 hours have elapsed after the engine stops, and if 48 hours have not elapsed, comparing the second signal with the first signal may be performed.

According to the method of operating the boil-off gas active purge intake/exhaust system and the boil-off gas active purge intake/exhaust system according to an embodiment of the present invention configured as described above, since the boil-off gas can be compressed inside the purge line by the operation of the purge pump and the purge valve, the turbocharger Evaporation gas can be supplied smoothly to the intake pipe of a vehicle equipped with.

In addition, since the amount of the evaporated gas and the concentration of the evaporated gas moving to the intake pipe can be controlled by the operation of the purge pump and the purge valve, the evaporated gas collected in the canister is relatively short even when the engine has a running time relatively short. Can be sufficiently supplied to the intake pipe.

In addition, after the engine is stopped, the amount of evaporation gas remaining inside the canister is controlled by operating the purge pump based on the signal detected by the concentration sensor. do. In particular, it is possible to maximize fuel efficiency by minimizing the amount of purge pump operation while driving the vehicle.

1 is an exemplary view of an evaporative gas active purge intake and exhaust system of an embodiment of the present invention,
2 is a flowchart of an embodiment of the present invention and a method of operating an evaporative gas active purge intake and exhaust system.

Hereinafter, an evaporation gas active purge intake and exhaust system and a method of operating an evaporation gas active purge intake and exhaust system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As illustrated in FIG. 1, in the active purge intake/exhaust system of an evaporation gas according to an embodiment of the present invention, air in the air is provided to the canister 100 and the canister 100 that adsorbs the evaporation gas generated in the fuel tank T. The banline 200 connected to the canister 100 to be introduced, the adsorption line 300 connecting the canister 100 and the fuel tank T, and the purge line connecting the canister 100 and the intake pipe P 400, a purge pump 500 provided in the purge line 400, a purge valve 600 provided in the purge line 400 to be positioned between the purge pump 500 and the intake pipe P, and the intake pipe It includes an engine (E) connected to the (P), and a motor (M) providing a driving force separately from the engine (E) to the drive wheel (W) to which the engine (E) provides power. The motor M can be driven even after the engine E is stopped.

The canister 100 includes an air compartment 110 connected to the bantra 200 and an adsorption compartment 120 located on one side of the air compartment 110 and connected to the adsorption line 300 and the purge line 400. Included, a hydrocarbon concentration sensor 130 is mounted on one side of the communication unit communicating the air compartment 110 and the adsorption compartment 120. Even after the start is stopped, the concentration of the boil-off gas collected in the canister 100 is monitored through the concentration sensor 130.

The bantraline 200 is equipped with a filter 220 for removing foreign substances contained in the air flowing into the bantraline 200 and a vent valve 210 for turning on and off the bantraline 200.

The purge line 400 may be provided with a first sensor and a second sensor at the front and rear ends of the purge pump 500 to measure the pressure at the front and rear ends of the purge pump 500. The purge valve 600 is provided as a solenoid valve. The amount of opening of the purge valve 600 is adjusted through duty control.

The connecting portion of the intake pipe P and the purge line 400 is located between the throttle valve 700 and the combustion chamber. Compressed boil-off gas by the operation of the purge pump 500 is supplied to the rear end of the throttle valve 700. When the engine E stops, the throttle valve 700 is completely closed, and thus, by the operation of the purge pump 500, the evaporated gas is located between the throttle valve 700 and the intake valve.

The intake pipe is equipped with a compressor (C) to compress the intake air and supercharge it in the combustion chamber. The compressor C is located at the front end of the throttle valve 700.

According to the active purge system of one embodiment of the present invention configured as described above, since the boil-off gas collected in the canister 100 by the purge pump 500 is compressed in the purge line 400, the intake pipe by the compressor operation ( P) Even if the internal pressure is equal to or greater than atmospheric pressure, it is possible to supply the evaporated gas to the intake pipe P. In addition, as the operation of the purge pump 500 and the purge valve 600 are combined, the concentration of the evaporated gas compressed in the purge line 400 can be adjusted, and the purge line 400 is supplied to the intake pipe P It is possible to control the flow rate of the evaporated gas.

Since the flow rate of the boil-off gas supplied from the purge line 400 to the intake pipe P can be controlled, even if the engine E operating time is relatively small compared to the natural intake engine E, it is collected in the canister 100. It is possible to sufficiently provide the boil-off gas to the intake pipe (P). In particular, it is possible to maximize fuel efficiency by minimizing the amount of operation of the purge pump 500 while driving the vehicle to lower the driving horsepower.

The active purge system of one embodiment of the present invention configured as above is operated according to the procedure diagram shown in FIG. 2.

As shown in Figure 2, the method of operating the boil-off gas active purge intake and exhaust system of an embodiment of the present invention, the engine (E) connected to the intake pipe (P) stops at the same time as the electrical signal generated by the concentration sensor (130) Step S100 of recording a signal and step S200 of comparing a second signal, which is an electrical signal generated by the concentration sensor 130, with a first signal, and a purge pump when the second signal is larger than the first signal It includes a step (S300) of operating the (500), and a step (S400) of determining whether 48 hours have elapsed since the engine E stopped.

In operation S300 of operating the purge pump 500, the purge pump 500 is driven for 10 seconds, and the purge valve 600 remains open. The boil-off gas collected in the canister 100 by the operation of the purge pump 500 is located between the throttle valve 700 and the intake valve. Therefore, there is less room for leakage through the canister 100 into the atmosphere.

After performing the step (S300) of operating the purge pump 500, the step (S200) of comparing the second signal with the first signal is repeatedly performed. By repeating the step (S200) of comparing the second signal with the first signal, it can be seen whether the evaporation gas collected from the fuel tank T to the canister 100 is continuously generated. In addition, since the step (S300) of operating the purge pump 500 is repeated in some cases, it is possible to properly maintain the boil-off gas collected inside the canister 100.

If it is determined in step S400 that 48 hours have elapsed after the engine E stops, and it is determined that 48 hours have not elapsed, a step S200 of comparing the second signal with the first signal is performed, and 48 hours have elapsed. If it is determined, the operation of the boil-off gas active purge intake and exhaust system of one embodiment of the present invention is stopped.

The step (S400) of comparing the second signal with the first signal for 48 hours after the engine E stops is repeatedly performed, and if necessary, the step of operating the purge pump 500 (S300) is repeated, so that the canister ( 100) It is possible to properly maintain the boil-off gas collected inside, and it is prevented that the boil-off gas collected in the canister 100 leaks into the atmosphere. When 48 hours have elapsed since the engine E stopped, the operation of the evaporative gas active purge intake and exhaust system of one embodiment of the present invention is stopped, so that discharge of the battery provided to the vehicle is prevented.

According to the method of operating the boil-off gas active purge intake/exhaust system and the boil-off gas active purge intake/exhaust system according to an embodiment of the present invention, the purge pump 500 and the purge valve 600 are operated to purify the inside of the purge line 400 Since the gas can be compressed, it is possible to smoothly supply the evaporated gas to the intake pipe P of the vehicle equipped with the turbocharger.

In addition, since the amount of the evaporation gas and the concentration of the evaporation gas moving to the intake pipe P by the operation of the purge pump 500 and the purge valve 600 can be adjusted, the operating time of the engine E is a natural intake engine ( E) Even if it is relatively short compared to a vehicle, the vaporized gas collected in the canister 100 can be sufficiently supplied to the intake pipe P.

In addition, after stopping the engine E, the purge pump 500 is operated on the basis of the signal detected by the concentration sensor 130 to control the amount of evaporation gas remaining inside the canister 100. It is prevented that the evaporated gas trapped in the atmosphere at 100 is leaked. In particular, it is possible to maximize fuel efficiency by minimizing the amount of operation of the purge pump 500 during operation.

100: canister 110: air compartment
120: adsorption compartment 130: concentration sensor
200: Vant line 210: Vent valve
220: filter 300: adsorption line
400: purge line 500: purge pump
600: purge valve 700: throttle valve
T: Fuel tank P: Intake pipe
E: Engine W: Drive wheel
M: Motor C: Compressor

Claims (8)

In the intake and exhaust system provided to the vehicle to burn the evaporated gas generated in the fuel tank,
A canister adsorbing the boil-off gas generated in the fuel tank;
A banline connected to the canister to allow air to flow into the canister;
An adsorption line connecting the canister and the fuel tank;
A purge line connecting the canister and the intake pipe;
A purge pump provided in the purge line;
And a purge valve provided in the purge line so as to be located between the purge pump and the intake pipe,
The canister,
An air compartment connected to the bantraline;
Located on one side of the air compartment, and includes an adsorption compartment connected to the adsorption line and the purge line,
A hydrocarbon concentration sensor is mounted on one side of the communication part communicating the air compartment and the adsorption compartment,
An evaporative gas active purge intake/exhaust system that monitors the concentration of the evaporated gas collected in the canister through the concentration sensor even after the start of the vehicle is stopped.
According to claim 1,
An engine connected to the intake pipe;
And a motor that provides a driving force separately from the engine to a driving wheel that the engine provides power.
According to claim 2,
The motor, even after the engine stops, the evaporative gas active purge intake and exhaust system to drive.
According to claim 1,
An evaporative gas active purge intake and exhaust system in which a compressor is mounted on the intake pipe to compress air intake in the intake pipe.
In the active purge system driving method for driving the active purge system of claim 1,
Recording a first signal that is an electrical signal generated by the concentration sensor at the same time as the engine stop connected to the intake pipe;
Determining whether a second signal, which is an electrical signal generated by the concentration sensor, is greater than the first signal;
And when the second signal is greater than the first signal, operating the purge pump.
The method of claim 5,
In the step of operating the purge pump,
The purge pump is driven for 10 seconds, the purge valve is an active purge intake and exhaust system operating method of maintaining an open state.
The method of claim 5,
After performing the step of operating the purge pump, the method of operating the boil-off gas active purge intake and exhaust system repeatedly performing the step of comparing the second signal with the first signal.
The method of claim 5,
Further comprising the step of determining whether 48 hours have elapsed after the engine stops,
If 48 hours has not elapsed, the method of operating the evaporative gas active purge intake and exhaust system in which the step of comparing the second signal with the first signal is performed.

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