KR102588075B1 - Negative pressure signal generation apparatus of vehicle - Google Patents

Abstract

The present invention relates to a negative pressure signal generation control device for a vehicle, which prevents the vehicle from generating an evaporative gas leak alarm checked by the gasoline electronic control unit (ECU) when a vehicle running on gasoline fuel is changed to LPG fuel and driven. It relates to a negative pressure signal generation control device. For this purpose, the gasoline fuel tank part where gasoline fuel is stored, the canister part arranged to receive the evaporative gas from the gasoline fuel tank part through the first evaporative gas discharge pipe, and the intake unit arranged to receive the evaporative gas from the canister part through the second evaporative gas discharge pipe. An atmospheric discharge unit arranged to release the evaporated gas from the manifold unit and the canister unit into the atmosphere through the third evaporated gas discharge pipe, and a canister disposed on the path of the third evaporated gas discharge pipe to control the emission of evaporated gas into the atmosphere according to a control signal. The valve unit, the evaporative gas control valve unit disposed on the path of the second evaporative gas discharge pipe to supply evaporative gas to the intake manifold according to a control signal, the canister closing valve unit, and the evaporative gas control valve unit, according to the valve open/closed status of the gasoline A fuel tank pressure measurement sensor unit that measures the pressure of the fuel tank unit, a gasoline electronic control unit unit that generates the first valve control signal of the canister closing valve unit and the second valve control signal of the evaporative gas control valve unit, and the gasoline electronic control unit unit unit. A negative pressure signal generation control device for a vehicle is disclosed, which includes an LPG electronic control unit unit that receives 1 and 2 valve control signals, generates a negative pressure signal according to preset conditions, and transmits the negative pressure signal to the gasoline electronic control unit unit.

Description

Negative pressure signal generation apparatus of vehicle}

The present invention relates to a negative pressure signal generation control device for a vehicle, and more specifically, when a vehicle running on gasoline fuel is modified to run on LPG fuel, the evaporation gas checked by the gasoline electronic control unit (ECU) This relates to a control device for generating a negative pressure signal for a vehicle that prevents a leak alarm from occurring.

The electronic control unit of a vehicle running on gasoline fuel must check the detection of evaporative gas leakage during operation in accordance with OBD II related regulations. At this time, the gasoline electronic control unit can check whether leakage is detected by controlling the PCSV valve and CCV valve to check the pressure in the fuel tank.

In addition, when using LPG fuel instead of gasoline fuel, it is desirable to remove the gasoline fuel tank, canister, intake manifold, and various valves required when using existing gasoline fuel when remodeling the vehicle to reduce the weight of the vehicle. At this time, since the gasoline fuel tank and other additional devices are removed to reduce the weight of the vehicle and the vehicle is modified to run using LPG fuel, the gasoline electronic control unit detects an evaporative gas leak detection alarm that is inevitably caused by non-use of gasoline fuel. There is a need to prevent it from happening.

KR 10-1252776 (Title of invention: Evaporative gas leak diagnosis device and method)

Therefore, the present invention was created to solve the problems described above. When a preset condition is met in the LPG electronic control unit, a negative pressure signal is randomly generated and transmitted to the gasoline electronic control unit, thereby generating an evaporative gas leak alarm. The purpose is to provide an invention that prevents this from happening.

However, the objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

The object of the present invention described above is the LPG fuel tank unit in which LPG fuel is stored, the gasoline electronic control unit unit that generates the first valve control signal of the canister closing valve unit and the second valve control signal of the evaporative gas control valve unit, and the gasoline fuel unit. When using LPG fuel without using, the LPG electronic control unit receives the first and second valve control signals from the gasoline electronic control unit, generates a negative pressure signal according to preset conditions, and transmits it to the gasoline electronic control unit. This can be achieved by providing a negative pressure signal generation control device for a vehicle, comprising:

In addition, the electrical connection between the canister closing valve part and the gasoline electronic control unit part is first short-circuited at one point, and the gasoline electronic control unit part and the LPG electronic control unit part are first electrically connected at one point to connect the gasoline electronic control unit part to the gasoline electronic control unit part. A first valve control signal line for transmitting the generated first valve control signal to the LPG electronic control unit unit, a second short-circuit at one point of the electrical connection between the evaporative gas control valve unit and the gasoline electronic control unit unit, and the gasoline electronic control unit unit. A second valve control signal line that electrically connects the unit and the LPG electronic control unit unit at one point to transmit the second valve control signal generated in the gasoline electronic control unit unit to the LPG electronic control unit unit, the pressure of the gasoline fuel tank unit The electrical connection between the fuel tank pressure measurement sensor unit that measures the pressure and the gasoline electronic control unit unit is short-circuited at one point, and the gasoline electronic control unit unit and the LPG electronic control unit unit are electrically connected at a third point at one point to control the LPG electronic control unit. It includes a pressure measurement signal line that transmits the negative pressure signal generated in the unit unit to the gasoline electronic control unit unit.

In addition, the first valve control signal is not transmitted to the canister closing valve part according to the first short circuit of the first valve control signal line, and the second valve is not transmitted to the evaporation gas control valve part according to the second short circuit of the second valve control signal line. The control signal is not transmitted, and the pressure measurement signal is not transmitted to the gasoline electronic control unit according to the third paragraph of the pressure measurement signal line, so the negative pressure signal generated in the LPG electronic control unit is transmitted to the gasoline electronic control through the pressure measurement signal line. It is transmitted to the unit unit.

In addition, the LPG electronic control unit receives a state transition signal for the valve open/closed state of the canister closing valve unit and the evaporative gas control valve unit from the gasoline electronic control unit unit when it meets a preset valve state stage signal condition. The negative pressure signal is generated and transmitted to the gasoline electronic control unit.

In addition, the LPG electronic control unit divides the valve open/closed state control signal of the canister closing valve unit and the evaporative gas control valve unit input from the gasoline electronic control unit unit into a closed state control signal of the canister closing valve unit from the overall valve closing state signal. When the evaporative gas control valve portion transitions to an open state control signal, the negative pressure signal is generated and transmitted to the gasoline electronic control unit portion.

In addition, the negative pressure signal generated by the LPG electronic control unit is a preset value between 0 and 5 [v].

In addition, the gasoline electronic control unit unit includes a CCV control signal generator that generates a first valve control signal to control the valve open/closed state of the canister closing valve portion, and a second valve control portion to control the valve open/closed state of the evaporative gas control valve portion. A PCSV control signal generation unit that generates a signal, a negative pressure signal check unit that receives the negative pressure signal generated from the LPG electronic control unit and compares it with a preset reference comparison signal, and generates a normal message if the negative pressure signal is normal according to the comparison. , an evaporative gas leak alarm generator that generates an evaporative gas leak alarm according to a message transmitted from the negative pressure signal check unit, and a control unit that controls an engine driven by gasoline and controls an input device and a storage device.

In addition, the LPG electronic control unit includes a CCV control signal detection unit that receives the first valve control signal generated by the CCV control signal generator, and a CCV control signal detector that receives the second valve control signal generated by the PCSV control signal generator. It receives the first and second valve control signals transmitted from the PCSV control signal detection unit, the CCV control signal detection unit and the PCSV control signal detection unit, and the first and second valve control signals are all converted into the valve closed state signal to the first valve control signal. When the valve control signal is a valve closed state control signal and the second valve control signal transitions to a valve open state control signal, a negative pressure signal generating unit that generates a negative pressure signal and transmits it to the negative pressure signal check unit, controls a vehicle driven by LPG. Includes a control unit.

According to the present invention as described above, the LPG electronic control unit randomly generates a negative pressure signal when a preset condition is met and transmits it to the gasoline electronic control unit, thereby preventing an evaporative gas leak alarm from occurring.

The following drawings attached to this specification illustrate a preferred embodiment of the present invention, and serve to further understand the technical idea of the present invention along with the detailed description of the invention. Therefore, the present invention is limited to the matters described in such drawings. It should not be interpreted in a limited way.
1 is a diagram briefly showing the configuration when using gasoline fuel according to an embodiment of the present invention,
Figure 2 is a diagram briefly showing the connection relationship when using LPG fuel instead of gasoline fuel according to an embodiment of the present invention;
Figure 3 is a diagram showing the connection relationship between the CCV valve, PCSV valve, gasoline electronic control unit, and LPG electronic control unit according to an embodiment of the present invention;
Figure 4 is a diagram showing the connection relationship between a gasoline electronic control unit and an LPG electronic control unit according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In addition, one embodiment described below does not unduly limit the content of the present invention described in the claims, and it cannot be said that all of the configurations described in this embodiment are essential as a solution to the present invention. In addition, descriptions of matters that are obvious to those skilled in the art and skilled in the art may be omitted, and descriptions of such omitted components (methods) and functions may be sufficiently referenced without departing from the technical spirit of the present invention.

The negative pressure signal generation control device for a vehicle equipped with a heterogeneous fuel tank according to an embodiment of the present invention is used by LPG Electronics when controlling the operation of a vehicle driven by gasoline fuel using LPG fuel, as shown in FIGS. 1 and 2. This is a device that prevents an evaporative gas leak alarm from occurring by arbitrarily generating a negative pressure signal in the control unit unit 420 and transmitting it to the gasoline electronic control unit unit 410. Hereinafter, a negative pressure signal generation control device for a vehicle equipped with heterogeneous fuel tanks according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

According to one embodiment of the present invention, the gasoline fuel tank unit 100 can be removed from the vehicle in order to use a vehicle using existing gasoline fuel as LPG fuel. In addition, upon removal of the gasoline fuel tank unit 100, the canister unit 200, intake manifold unit 300, canister closing valve unit 510, evaporative emission control valve unit 520, and fuel tank pressure described below are removed. The measurement sensor unit 530, the atmospheric discharge unit 600, and the plurality of evaporative gas discharge pipes 11, 12, and 13 can all be removed from the vehicle as needed. However, for convenience of explanation of the present invention when converting an existing gasoline fuel vehicle to an L-pitch fuel vehicle, an embodiment of the present invention will be described together.

The LPG fuel tank unit (not shown) is newly attached to the vehicle to supply fuel to the vehicle. Gasoline fuel may be stored in the gasoline fuel tank unit 100, and LPG fuel may be stored in the LPG fuel tank unit. Since the gasoline fuel tank unit 100 uses LPG fuel from the LPG fuel tank unit, gasoline fuel is not actually stored and is removed as described above.

In general, when running on gasoline fuel, the gasoline electronic control unit unit 410 periodically checks for leakage of evaporated gas vaporized in the gasoline fuel tank unit 100 according to predetermined rules (this is referred to as OBD II). At this time, when using LPG fuel instead of gasoline fuel, the gasoline electronic control unit unit 410 periodically checks for leakage of evaporative gas as described above, and accordingly, a negative pressure signal is transmitted to the gasoline electronic control unit unit ( 410), an evaporative gas leak alarm (or engine check valve alarm) occurs. In order to avoid generating such an evaporative gas leak alarm, the LPG electronic control unit 420 generates a negative pressure signal according to preset conditions and transmits it to the gasoline electronic control unit 410.

Meanwhile, when using gasoline fuel before vehicle modification, the gasoline electronic control unit (410, ECU) periodically checks for evaporative gas leakage according to established rules. During engine start-up, the gasoline electronic control unit unit 410 controls both the canister closing valve unit 510 and the evaporative emission control valve unit 520 to be 'open'. At this time, the pressure (or differential pressure) of the fuel tank pressure measurement sensor unit 530 is measured to be the same as atmospheric pressure. The steps for detecting evaporative gas leakage before vehicle modification are as follows.

As a first step in detecting evaporative gas leakage, the gasoline electronic control unit 410 transmits valve control signals to both sides so that the valves of the canister closing valve 510 and the evaporative gas control valve 520 are 'closed'. . At this time, the pressure measured by the fuel tank pressure measurement sensor unit 530 is slightly higher than atmospheric pressure due to the evaporation gas.

In the second stage of evaporative gas leak detection, the valve of the canister closing valve unit 510 transmits a valve control signal to be 'closed', and the valve of the evaporative gas control valve unit 520 is 'opened' (high duty control). The electronic control unit unit 410 transmits a valve control signal. At this time, the pressure measured by the fuel tank pressure measurement sensor unit 530 changes to negative pressure (for example, up to -1.5 kPa) depending on the vacuum of the surge tank. At this time, if the measured pressure does not fall to 'negative pressure', it is determined that there is a leak of evaporative gas.

Meanwhile, in the present invention, the LPG electronic control unit unit (420, ECU) detects the state transition signal of the valve control signal when transitioning from the 1st stage of evaporation gas leakage detection to the 2nd stage of evaporation gas leakage detection, and arbitrarily generates a 'negative pressure signal'. and transmitting the generated negative pressure signal to the gasoline electronic control unit 410 to prevent the gasoline electronic control unit 410 from generating an evaporative gas leak alarm.

As a third step in detecting evaporative gas leakage, the gasoline electronic control unit 410 controls both the canister closing valve unit 510 and the evaporative gas control valve unit 520 to be 'closed'. At this time, the pressure measured by the fuel tank pressure measurement sensor unit 530 gradually returns to the pressure inside the fuel tank as the vacuum pressure is blocked.

In the fourth step of leakage detection, the gasoline electronic control unit unit 410 controls both the canister closing valve unit 510 and the evaporative gas control valve unit 520 to 'open'. At this time, the pressure of the fuel tank pressure measurement sensor unit 530 returns to the pressure inside the fuel tank as the vacuum pressure is blocked.

Referring to Figures 1 and 2, the gasoline fuel tank unit 100 according to an embodiment of the present invention is a tank in which gasoline fuel is stored, but since LPG fuel is used in the present invention, gasoline fuel is not stored and is removed.

The canister unit 200 according to an embodiment of the present invention receives the evaporative gas of gasoline fuel stored in the gasoline fuel tank unit 100 through the first evaporative gas discharge pipe 11. However, in the present invention, since gasoline fuel is not stored, evaporative gas is not actually generated, and therefore, evaporative gas is not supplied to the canister unit 200 and can be removed during vehicle modification.

The canister unit 200 is connected to the gasoline fuel tank unit 100 and the first evaporative gas discharge pipe 11, and is connected to the atmospheric discharge unit 600 and the third evaporative gas discharge pipe 13. It is connected to the manifold unit 300 and the second evaporation gas discharge pipe 12.

An evaporative gas control valve unit (520, PCSV) is disposed at a point of the second evaporative gas discharge pipe 12, and a canister closing valve unit 510 (CCV) is disposed at a point of the third evaporative gas discharge pipe 13. . Additionally, a fuel tank pressure measurement sensor unit 530 (FTPS) is disposed in one area of the gasoline fuel tank unit 100 to measure the pressure (or differential pressure) of the fuel tank.

The intake manifold unit 300 according to an embodiment of the present invention receives evaporation gas from the canister unit through the second evaporation gas discharge pipe 12. An evaporative gas control valve unit 520 is disposed between the intake manifold unit 300 and the canister unit 200 to control the supply of evaporative gas.

The atmospheric discharge unit 600 according to an embodiment of the present invention is connected to the canister unit 200 and the third evaporation gas discharge pipe 13, and the canister is closed according to the valve opening/closing of the canister closing valve unit 510. The boil-off gas stored in unit 200 is released into the atmosphere.

The canister closing valve unit 510 according to an embodiment of the present invention is disposed on the path of the third evaporation gas discharge pipe 13, and the valve is opened/closed according to a control signal from the gasoline electronic control unit unit 410. Controls the emission of evaporative gases into the atmosphere. In addition, the evaporative gas control valve unit 520 is disposed on the path of the second evaporative gas discharge pipe 12, and the valve opens/closes according to a control signal from the gasoline electronic control unit 410 to direct evaporative gas into the intake manifold. Supply is controlled by the department. The fuel tank pressure measurement sensor unit 530 is disposed at one point of the gasoline fuel tank unit 100 and depends on the valve 'open/closed' status of the canister closing valve unit 510 and the evaporative gas control valve unit 520. The pressure (or differential pressure with atmospheric pressure) of the gasoline fuel tank unit 100 is measured.

The gasoline electronic control unit unit 410 according to an embodiment of the present invention provides a first valve control signal for controlling the valve of the canister closing valve unit 510 and a second valve control signal for controlling the valve of the evaporative gas control valve unit 520. Each valve control signal is generated. The first valve control signal and the second valve control signal are signals that control the opening/closing of the valve.

In Figure 1, the gasoline electronic control unit unit 410 is shown as receiving a fuel tank pressure measurement signal measured by the fuel tank pressure measurement sensor unit 530 through the pressure measurement signal line 23. However, in the present invention, since the gasoline fuel tank unit 100 is removed, the pressure measurement signal line 23 is short-circuited at the third short-circuit point 33 as shown in FIG. 2.

The LPG electronic control unit 420 according to an embodiment of the present invention receives the first and second valve control signals generated by the gasoline electronic control unit 410 and generates a negative pressure signal according to preset conditions to generate a gasoline electronic control signal. It is transmitted to the control unit unit 410. By transmitting the negative pressure signal, the gasoline electronic control unit unit 410 does not generate an evaporative gas leak alarm.

The LPG electronic control unit unit 420 changes the state between the 'closed state' of the canister closing valve part and the 'open state' of the evaporative gas control valve part in the above-described second stage of leakage detection (i.e., from the first stage of leakage detection to the second stage of leakage detection). (changed to), a negative pressure signal is generated and transmitted to the gasoline electronic control unit unit 410. The generated negative pressure signal may be a preset value between 0 and 5[v].

Meanwhile, referring to Figures 3 and 4, the gasoline electronic control unit unit 410 includes a CCV control signal generation unit 412, a PCSV control signal generation unit 411, a negative pressure signal check unit 413, and an evaporative gas leak alarm. It includes a generator 414 and a control unit 415.

The CCV control signal generator 412 generates a first valve control signal to control the valve open/closed state of the canister closing valve portion 510. The PCSV control signal generator 411 generates a second valve control signal to control the valve open/closed state of the evaporative gas control valve portion 520. The negative pressure signal check unit 413 receives the negative pressure signal generated by the LPG electronic control unit 420, compares it with a preset reference comparison signal, and generates a 'negative pressure signal normal message' if the negative pressure signal is normal according to the comparison. and transmits it to the evaporative gas leak alarm generator 414. The evaporative gas leak alarm generator 414 generates an evaporative gas leak alarm according to the message transmitted from the negative pressure signal checker 413. That is, when a normal negative pressure signal message is received, an evaporative gas leak alarm is not generated, and when a negative pressure signal abnormal message is received, an evaporative gas leak alarm is generated. As an example, the control unit 415 controls the operation of an engine driven by gasoline, injection, ignition control, and a fuel pump, and controls an input device and a storage device.

In addition, the LPG electronic control unit unit 420 includes a CCV control signal detection unit 422, a PCSV control signal detection unit 421, a negative pressure signal generation unit 423, and a control unit 424.

The CCV control signal detection unit 422 receives the first valve control signal generated by the CCV control signal generator 412 through the first valve control signal lines 21 and 21'. The PCSV control signal detection unit 421 receives the second valve control signal generated by the PCSV control signal generator 411 through the second valve control signal lines 22 and 22'. The negative pressure signal generator 423 receives the first and second valve control signals transmitted from the CCV control signal detector 422 and the PCSV control signal detector 421, and changes the leakage detection stage 1 to the leakage detection stage 2. In the state transition of the valve control signal, the first valve control signal is a 'closed' control signal, and the second valve control signal is an 'open' control signal, which is a control signal that transitions from the first stage of leakage detection to the second stage of leakage detection. When receiving a negative pressure signal, the negative pressure signal generator 423 generates a negative pressure signal. The generated negative pressure signal is transmitted to the negative pressure signal check unit 413 through the pressure measurement signal lines 23 and 23'. The control unit 424 controls the vehicle driven by LPG and controls the input device and storage device.

Meanwhile, the first valve control signal lines 21 and 21' first short-circuit the electrical connection between the canister closing valve part 510 and the gasoline electronic control unit part 410 at the first short-circuit point 31, and The control unit unit 410 and the LPG electronic control unit unit 420 are first electrically connected at the first connection point 41 to create a first connection of the canister closing valve unit 510 generated in the gasoline electronic control unit unit 410. 1 Transmit the valve control signal to the LPG electronic control unit unit 420. The first valve control signal is not transmitted to the canister closing valve unit 510 due to the first short circuit at the first short circuit point 31 of the first valve control signal lines 21 and 21'.

In addition, the second valve control signal lines 22 and 22' short-circuit the electrical connection between the evaporative gas control valve unit 520 and the gasoline electronic control unit unit 410 at the second short-circuit point 32, and The evaporative gas control valve unit 520 generated in the gasoline electronic control unit unit 410 by electrically connecting the electronic control unit 410 and the LPG electronic control unit 420 at the second connection point 420. The second valve control signal is transmitted to the LPG electronic control unit unit 420. The second valve control signal is not transmitted to the evaporative gas control valve unit 520 due to the second short circuit at the second short circuit point 32 of the second valve control signal line 22, 22'.

In addition, the pressure measurement signal lines 23 and 23' short-circuit the electrical connection between the fuel tank pressure measurement sensor unit 530 and the gasoline electronic control unit unit 410 at the third short-circuit point 33, and The control unit unit 410 and the LPG electronic control unit unit 420 are electrically thirdly connected at the third connection point 43 to transmit the negative pressure signal generated in the LPG electronic control unit unit 420 to the gasoline electronic control unit unit ( 410). According to the third short circuit at the third short circuit point 33 of the pressure measurement signal lines 23 and 23', the pressure measurement signal is not transmitted to the gasoline electronic control unit 410, and the LPG electronic control unit 420 The negative pressure signal generated is transmitted to the gasoline electronic control unit 410 through the pressure measurement signal line.

In explaining the present invention, matters that are obvious to those skilled in the art and skilled in the art may be omitted, and descriptions of such omitted components (methods) and functions may be sufficiently referenced without departing from the technical spirit of the present invention. You will be able to. In addition, the components of the present invention described above are only described for the convenience of explaining the present invention, and components not described herein may be added without departing from the technical spirit of the present invention.

The description of the configuration and function of each part described above is explained separately from each other for convenience of explanation, and if necessary, one configuration and function may be implemented by integrating with other components, or may be implemented in further detail.

Although the present invention has been described above with reference to one embodiment, the present invention is not limited to this, and various modifications and applications are possible. That is, those skilled in the art will easily understand that many modifications are possible without departing from the gist of the present invention. In addition, it should be noted that if a specific description of the known functions and their configurations related to the present invention or the combination relationship between each component of the present invention is judged to unnecessarily obscure the gist of the present invention, the detailed description has been omitted. something to do.

11: First evaporation gas discharge pipe
12: Second evaporation gas discharge pipe
13: Third evaporation gas discharge pipe
21,21': 1st valve control signal line
22,22': 2nd valve control signal line
23,23': Pressure measurement signal line
31: first paragraph point
32: second paragraph point
33: Third paragraph point
41: first connection point
42: second connection point
43: third connection point
100: Gasoline fuel tank part
200: Canister part
300: intake manifold
410: Gasoline electronic control unit unit
411: PCSV control signal generator
412: CCV control signal generator
413: Negative pressure signal check unit
414: Evaporative gas leak alarm generator
415: control unit
420: LPG electronic control unit unit
421: PCSV control signal detection unit
422: CCV control signal detection unit
423: Negative pressure signal generator
424: control unit
510: Canister closing valve unit (CCV)
520: Evaporative gas control valve unit (PCSV)
530: Fuel tank pressure measurement sensor unit (FTPS)
600: Atmospheric emission unit

Claims (8)

LPG fuel tank section where LPG fuel is stored,
A gasoline electronic control unit unit that generates a first valve control signal of the canister closing valve unit and a second valve control signal of the evaporative gas control valve unit, respectively;
When using LPG fuel instead of gasoline fuel, the LPG electronic control receives the first and second valve control signals from the gasoline electronic control unit, generates a negative pressure signal according to preset conditions, and transmits it to the gasoline electronic control unit. A negative pressure signal generation control device for a vehicle, comprising a unit unit.
According to claim 1,
The electrical connection between the canister closing valve unit and the gasoline electronic control unit unit is first short-circuited at one point, and the gasoline electronic control unit unit and the LPG electronic control unit unit are first electrically connected at one point to control the gasoline electronic control unit. A first valve control signal line for transmitting the first valve control signal generated in the LPG electronic control unit to the LPG electronic control unit,
The electrical connection between the evaporative gas control valve and the gasoline electronic control unit is secondly short-circuited at one point, and the gasoline electronic control unit and the LPG electronic control unit are secondly electrically connected at one point to control the gasoline electronic control. A second valve control signal line for transmitting the second valve control signal generated in the unit unit to the LPG electronic control unit unit,
The electrical connection between the fuel tank pressure measurement sensor unit that measures the pressure of the gasoline fuel tank unit and the gasoline electronic control unit unit is short-circuited at a third point, and the gasoline electronic control unit unit unit and the LPG electronic control unit unit are electrically connected at one point. A negative pressure signal generation control device comprising a third connection to a pressure measurement signal line to transmit the negative pressure signal generated in the LPG electronic control unit to the gasoline electronic control unit.
According to claim 2,
The first valve control signal is not transmitted to the canister closing valve unit according to the first short circuit of the first valve control signal line,
The second valve control signal is not transmitted to the evaporative gas control valve unit according to the second short circuit of the second valve control signal line,
According to the third paragraph of the pressure measurement signal line, the pressure measurement signal is not transmitted to the gasoline electronic control unit unit, so that the negative pressure signal generated in the LPG electronic control unit unit is transmitted to the gasoline electronic control unit through the pressure measurement signal line. A negative pressure signal generation control device for a vehicle, characterized in that it is transmitted to the control unit.
According to claim 1,
The LPG electronic control unit unit,
When the state transition signal of the valve open/closed state of the canister closing valve unit and the evaporative gas control valve unit is input from the gasoline electronic control unit unit and meets a preset valve state stage signal condition, the negative pressure signal is generated to generate the gasoline A negative pressure signal generation control device for a vehicle, characterized in that it is transmitted to the electronic control unit.
According to claim 4,
The LPG electronic control unit unit,
The valve open/closed state control signal of the canister closing valve unit and the evaporative gas control valve unit input from the gasoline electronic control unit unit is divided into the closed state control signal of the canister closing valve unit and the open state of the evaporative gas control valve unit from the overall valve closed state signal. A negative pressure signal generation control device for a vehicle, characterized in that when it transitions to a control signal, the negative pressure signal is generated and transmitted to the gasoline electronic control unit.
According to claim 5,
A negative pressure signal generation control device for a vehicle, characterized in that the negative pressure signal generated by the LPG electronic control unit unit is a preset value between 0 and 5 [v].
According to claim 6,
The gasoline electronic control unit unit,
A CCV control signal generator that generates the first valve control signal to control the valve open/closed state of the canister closing valve unit,
A PCSV control signal generator that generates the second valve control signal to control the valve open/closed state of the evaporative gas control valve unit,
A negative pressure signal check unit that receives the negative pressure signal generated from the LPG electronic control unit unit, compares it with a preset reference comparison signal, and generates a normal message if the negative pressure signal is normal according to the comparison;
An evaporative gas leak alarm generator that generates an evaporative gas leak alarm according to the message transmitted from the negative pressure signal check unit;
A negative pressure signal generation control device for a vehicle, comprising a control unit that controls an engine driven by gasoline and controls an input device and a storage device.
According to claim 7,
The LPG electronic control unit unit,
A CCV control signal detection unit that receives the first valve control signal generated by the CCV control signal generation unit,
A PCSV control signal detection unit that receives the second valve control signal generated by the PCSV control signal generation unit,
The first and second valve control signals transmitted from the CCV control signal detection unit and the PCSV control signal detection unit are input, and when both the first and second valve control signals are valve closed state signals, the first valve control signal is the valve closed state signal. A negative pressure signal generator that is a state control signal and generates a negative pressure signal when the second valve control signal transitions to a valve open state control signal and transmits it to the negative pressure signal check section;
A negative pressure signal generation control device for a vehicle, comprising a control unit for controlling a vehicle driven by LPG.