CN115717557A - A crankcase ventilation system and method - Google Patents

Abstract

The invention discloses a crankcase ventilation system and method. The system includes a crankcase, an oil-gas separator, a first ventilation passage, a second ventilation passage, an intake pipe, an intake manifold, a double check valve, a check valve and a controller: the double check valve is arranged in the first ventilation passage In the air path between the intake manifold; the controller is electrically connected with the double check valve and the check valve respectively, and is used to control the double check valve to be in the first communication state and control the The one-way valve is closed so that the gas in the crankcase enters the intake manifold through the first ventilation passage and the double one-way valve; it is also used to control the The double one-way valve is in the second communication state and controls the conduction of the one-way valve, so that the gas in the crankcase enters the intake pipe through the second ventilation passage and the one-way valve, and enters the first ventilation passage through the double one-way valve, which can realize The integration of supplementary air and the first ventilation channel has a simple structure and saves cost.

Description

A crankcase ventilation system and method

technical field

The invention relates to the technical field of automobile engines, in particular to a crankcase ventilation system and method.

Background technique

With the successive implementation of relevant regulations on passenger cars in various places, the engine needs to be equipped with a PCV (Positive Crankcase Ventilation) system that meets the relevant regulations.

At present, due to the intermittent use of the hybrid supercharged engine, there is a low-temperature operating condition, and the engine needs to be supplemented with air to eliminate the water accumulation in the crankcase, so as to ensure the normal operation of the engine. The air supply channel supplies air to the engine, and has a complicated structure and high cost.

In addition, the current hybrid engine crankshaft ventilation system scheme adopted by original equipment manufacturers (OEM) is a continuous diagnosis circuit air supply pipe scheme. This scheme needs to integrate connectors in each ventilation pipeline of the PCV system. The connector collects corresponding electrical signals and transmits them to the electronic control unit (ECU) of the car. According to the electrical signals of the ECU, it is confirmed that the crankcase ventilation system is complete so as to meet the requirements of relevant regulations. The structure is complex and the cost is high.

Contents of the invention

Embodiments of the present invention provide a crankcase ventilation system and method. By setting double one-way valves, the integration of supplementary air and the first ventilation channel can be realized, and the structure is simple and the cost is saved.

In the first aspect, an embodiment of the present invention provides a crankcase ventilation system, including a crankcase, a crankcase, an oil-gas separator, a first ventilation channel, a second ventilation channel, an intake pipe, an intake manifold, and double one-way valves , one-way valve and controller:

The oil-gas separator communicates with the first ventilation passage and the second ventilation passage respectively;

The double one-way valve is arranged in the air path between the first ventilation channel and the intake manifold;

The one-way valve is arranged in the air path between the second ventilation channel and the intake pipe;

The controller is electrically connected to the double one-way valve and the one-way valve respectively, and is used to control the double one-way valve to be in the first communication state and control the one-way The valve is closed to allow the gas in the crankcase to enter the intake manifold through the first ventilation passage and the dual check valve; also for when the engine is in the second load state and the intake manifold When the pipe is in a positive pressure state, control the double one-way valve to be in the second communication state and control the conduction of the one-way valve so that the gas in the crankcase passes through the second ventilation channel and the one-way valve enters the intake pipe, and enters the first ventilation channel through the double one-way valve; wherein, the load amount in the first load state is smaller than the load amount in the second load state.

Optionally, the crankcase ventilation system also includes an air filter;

The air filter communicates with the intake pipe.

Optionally, the crankcase ventilation system also includes a heating channel;

The heating channel communicates with the air outlet of the intake manifold.

Optionally, the heating channel is integrated in the first ventilation channel.

Optionally, the double one-way valves are integrated in the first ventilation channel.

Optionally, the one-way valve is integrated in the intake pipe.

Optionally, the crankcase ventilation system also includes a pressure control valve;

The pressure control valve is integrally arranged on the oil-air separator, and the gas in the crankcase enters the first ventilation passage or the second ventilation passage through the pressure control valve.

Optionally, the crankcase ventilation system also includes a pressure sensor;

The pressure sensor is arranged on the intake manifold and is configured to detect the pressure value in the intake manifold;

The controller is electrically connected with the pressure sensor, and is used for monitoring the working state of the crankcase ventilation system according to the pressure value.

Optionally, the crankcase ventilation system also includes a supercharger and a throttle body;

The supercharger and the throttle body are arranged on a connecting passage between the intake pipe and the intake manifold.

In the second aspect, the embodiment of the present invention also provides a crankcase ventilation method, which is applied to the crankcase ventilation system described in any one of the first aspect, and the method includes:

When the engine is in the first load state, a first control signal is output to control the double one-way valve to be in the first communication state and to control the one-way valve to be closed, so that the gas in the crankcase passes through the first ventilation passage and the dual check valves enter the intake manifold;

When the engine is in the second load state and the intake manifold is in the positive pressure state, output a second control signal to control the double check valve to be in the second communication state and control the conduction of the check valve so that all The gas in the crankcase enters the intake pipe through the second ventilation passage and the one-way valve, and enters the first ventilation passage through the double one-way valve; wherein, the load in the first load state The amount is less than the load amount of the second load state.

In the crankcase ventilation system provided by the embodiment of the present invention, double check valves are arranged in the air path between the first ventilation passage and the intake manifold, and the check valve is arranged between the second ventilation passage and the intake pipe. In the air path between the two, when the engine is in the first load state, the controller can control the double check valves to be in the first communication state and control the check valves to close, so that the gas in the crankcase can enter the inlet through the first ventilation passage. The air manifold and can prevent air from entering the intake manifold; in addition, the controller is also used to control the double check valve to be in the second communication state and control the The one-way valve conducts, so that the gas in the crankcase enters the oil-air separator and then enters the intake pipe through the second ventilation channel and the one-way valve, and the air can enter the intake pipe. After the gas in the crankcase is mixed with air, it enters the intake manifold and passes through The double one-way valve enters the engine from the first ventilation channel to realize the air supply function, that is, the integration of the air supply and the first ventilation channel can be realized, the structure is simple, and the cost is saved.

Description of drawings

Fig. 1 is a schematic structural view of a crankcase ventilation system provided by an embodiment of the present invention;

Fig. 2 is a schematic flowchart of a crankcase ventilation method provided by an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Fig. 1 is a schematic structural diagram of a crankcase ventilation system provided by an embodiment of the present invention. As shown in Figure 1, the crankcase ventilation system includes a crankcase 100, an oil-gas separator 200, a first ventilation channel 300, a second ventilation channel 400, an intake pipe 500, an intake manifold 600, a double check valve 700, a single Directional valve 800 and controller: the oil-gas separator 200 communicates with the first ventilation passage 300 and the second ventilation passage 400 respectively; the double one-way valve 700 is arranged in the gas path between the first ventilation passage 300 and the intake manifold 600 The one-way valve 800 is arranged in the air path between the second ventilation channel 400 and the intake pipe 500; the controller is electrically connected with the double one-way valve 700 and the one-way valve 800 respectively, for when the engine is in the first load state , control the double one-way valve 700 to be in the first communication state and control the one-way valve 800 to close, so that the gas in the crankcase 100 enters the intake manifold 600 through the first ventilation channel 300 and the double one-way valve 700; it is also used for When the engine is in the second load state and the intake manifold 600 is in the positive pressure state, control the double check valve 700 to be in the second communication state and control the conduction of the check valve 800 so that the gas in the crankcase 100 passes through the second ventilation The passage 400 and the one-way valve 800 enter the intake pipe 500, and enter the first ventilation passage 300 through the double one-way valve 700; wherein, the load in the first load state is smaller than that in the second load state.

Exemplarily, the controller may be an ECU, and the controller is electrically connected to the double one-way valve 700 and the one-way valve 800 respectively. Exemplarily, the first load state may be a working condition in which the engine load is below 25%, that is, the engine is in a light load state; the second load state may be a working condition in which the engine load is above 85% but less than 100%, that is, the engine is in a The heavy load state, that is, the load amount in the first load state is smaller than the load amount in the second load state. Exemplarily, the negative pressure state of the intake manifold 600 may mean that when the engine speed is low, the intake manifold 600 is in a low air pressure condition, and the positive pressure state of the intake manifold 600 may mean that the engine speed is high, and further The air pressure of the air manifold 500 is greater than normal atmospheric pressure.

It should be noted that the double check valves 700 in the first communication state can allow the gas in the crankcase 100 to enter the intake manifold 600 through the first ventilation channel 300, and the double check valves 700 in the second communication state can allow the air to pass through the intake manifold 600. The air manifold 600 enters the first ventilation passage 300, thereby entering the engine to realize the function of supplementing air. In addition, the first ventilation channel 300 is integrated in the cylinder head assembly and cannot be disassembled, and the oil-air separator 200 is fixed on the cover by bolts to form a part of the engine, so the first ventilation channel 300 meets the requirements of relevant regulations.

Specifically, continue to refer to FIG. 1 , when the engine is in the first load state, the controller controls the double check valve 700 to be in the first communication state and controls the check valve 800 to shut off, so that the gas in the crankcase 100 enters the oil-gas separator 200 Then enter the intake manifold 600 through the first ventilation channel 300 and the dual one-way valve 700 , it can be understood that since the one-way valve 800 is closed, the air can be prevented from entering the intake manifold 600 . Further, when the engine is in the second load state and the intake manifold 600 is in the positive pressure state, the controller controls the double check valve 700 to be in the second communication state and controls the check valve 800 to conduct, so that the gas in the crankcase 100 It enters the oil-gas separator 200 and then enters the intake pipe 500 through the second ventilation channel 400 and the one-way valve 800. It can be understood that the air can enter the intake pipe 500, and the gas in the crankcase 100 is mixed with the air and enters the intake manifold 600. The double check valve 700 enters the engine from the first ventilation channel 300, so that when the engine is under heavy load and the intake manifold is in a positive pressure state, the controller can control the double check valve 700 to be in the second communication state, that is, it can Realize the function of air supplementing the crankcase ventilation system through double check valves.

In the crankcase ventilation system provided by the embodiment of the present invention, double check valves are arranged in the air path between the first ventilation passage and the intake manifold, and the check valve is arranged between the second ventilation passage and the intake pipe. In the air path between the two, when the engine is in the first load state, the controller can control the double check valves to be in the first communication state and control the check valves to close, so that the gas in the crankcase can enter the inlet through the first ventilation passage. The air manifold and can prevent air from entering the intake manifold; in addition, the controller is also used to control the double check valve to be in the second communication state and control the The one-way valve conducts, so that the gas in the crankcase enters the oil-air separator and then enters the intake pipe through the second ventilation channel and the one-way valve, and the air can enter the intake pipe. After the gas in the crankcase is mixed with air, it enters the intake manifold and passes through The double one-way valve enters the engine from the first ventilation channel to realize the air supply function, that is, the integration of the air supply and the first ventilation channel can be realized, the structure is simple, and the cost is saved.

Optionally, continuing to refer to FIG. 1 , the crankcase ventilation system further includes an air filter 900 ; the air filter 900 communicates with the intake pipe 500 .

Specifically, outside air may enter the intake pipe 500 after passing through the air filter 900 . When the engine is in the second load state and the intake manifold 600 is in the positive pressure state, the controller can control the double check valve 700 to be in the second communication state and control the check valve 800 to conduct, the gas in the crankcase 100 and the passing air The air from the filter 900 enters the intake manifold 600 after being mixed, and enters the first ventilation channel 300 through the double check valve 700 and enters the engine to realize the function of supplementing air.

Optionally, the crankcase ventilation system also includes a heating channel; the heating channel communicates with the air outlet of the intake manifold.

Specifically, referring to Fig. 1, outside air can enter the intake manifold 600 after passing through the air filter 900, and then heat the gas through the heating channel connected with the air outlet of the intake manifold 600, and the heated gas enters the engine It can absorb the water vapor in the engine and prevent the engine from accumulating water.

Optionally, the heating channel is integrated in the first ventilation channel.

Specifically, referring to FIG. 1 , outside air can enter the intake manifold 600 after passing through the air filter 900. It should be noted that, when the outside temperature is relatively low, the cold air passes through the air outlet of the intake manifold 600. The connected heating channel can heat the gas, and the heated gas can absorb the water vapor in the engine after entering the engine through the first ventilation channel 300, so as to prevent the engine from accumulating water.

Optionally, continuing to refer to FIG. 1 , the double check valve 700 is integrated in the first ventilation channel 300 .

Exemplarily, the double one-way valve 700 and the first ventilation channel may be fastened by a bolt structure.

Specifically, continue to refer to FIG. 1, when the engine is in the first load state, the controller controls the double check valve 700 to be in the first communication state, so that the gas in the crankcase 100 enters the oil-gas separator 200 and then passes through the first ventilation passage 300 and Dual check valves 700 enter intake manifold 600 . When the engine is in the second load state and the intake manifold 600 is in the positive pressure state, the controller controls the double check valve 700 to be in the second communication state, and the air can enter the intake manifold 600 and pass through the double check valve 700 from the first A ventilation channel 300 enters the engine to realize the function of replenishing air.

Optionally, continuing to refer to FIG. 1 , the one-way valve 800 is integrated in the intake pipe 500 .

Exemplarily, the one-way valve 800 and the intake pipe 500 can be integrated by thermoplastic molding, so as to realize the fastening of the one-way valve 800 and the intake pipe 500 .

Specifically, continuing to refer to FIG. 1 , when the engine is in a first load state, the controller controls the one-way valve 800 to close to prevent air from entering the intake manifold 600 . When the engine is in the second load state, the controller controls the one-way valve 800 to conduct, so that the gas in the crankcase 100 enters the oil-gas separator 200 and then enters the intake pipe 500 through the second ventilation channel 400 and the one-way valve 800 .

Optionally, the crankcase ventilation system further includes a pressure control valve; the pressure control valve is integrated on the oil-gas separator, and the gas in the crankcase enters the first ventilation channel or the second ventilation channel through the pressure control valve.

Specifically, continue to refer to Fig. 1, when the engine is in the first load state, the gas in the crankcase 100 can enter the first ventilation passage 300 through the pressure control valve on the oil-gas separator 200, further, when the engine is in the second load state At this time, the gas in the crankcase 100 can enter the second ventilation channel 400 through the pressure control valve on the oil-gas separator 200, that is, by integrating the pressure control valve on the oil-gas separator 200, the gas in the crankcase 100 can be controlled by pressure. The valve enters the first ventilation channel 300 or the second ventilation channel 400 .

Optionally, continuing to refer to FIG. 1 , the crankcase ventilation system further includes a pressure sensor; the pressure sensor is disposed on the intake manifold 700 and is configured to detect the pressure value in the intake manifold 700; the controller is electrically connected to the pressure sensor Connection for monitoring the operating state of the crankcase ventilation system based on the pressure value.

Exemplarily, the second ventilation channel 400 is a detachable connecting pipeline, and the "disassembly of the ventilation pipe on-board self-diagnostic system (On-Board Diagnostics, OBD) alarm" required by the regulations is realized through the following function: when the ventilation pipe is disassembled , through the negative pressure in the intake manifold 600, the air is sucked into the intake manifold 600 through the disconnection, and then the negative pressure value introduced into the air manifold 600 becomes smaller, and the controller triggers the intake pressure after exceeding the theoretical value of 20kPa alarm, and then monitor the working status of the crankcase ventilation system, so that the second ventilation channel 400 meets the requirements of relevant regulations. In addition, the use of pressure detection can replace the traditional continuous diagnostic circuit detection, that is, to achieve self-diagnosis, low detection cost, and high reliability of the detection method.

Optionally, continuing to refer to FIG. 1 , the crankcase ventilation system further includes a supercharger 1000 and a throttle body 1100 ; the supercharger 1000 and the throttle body 1100 are arranged between the intake pipe 500 and the intake manifold 600 on the connection path.

Specifically, outside air enters the intake pipe 500 after passing through the air filter 900 , then enters the intake manifold 600 through the supercharger 1000 and the throttle body 1100 , and then enters through the first ventilation passage 300 through the double check valve 700 engine, and then realize the function of supplementing air.

A crankcase ventilation system provided by an embodiment of the present invention includes a crankcase, an oil-air separator, a first ventilation channel, a second ventilation channel, an intake pipe, an intake manifold, double check valves, a check valve and a controller . By setting the double check valve in the air path between the first ventilation passage and the intake manifold, and the check valve in the air passage between the second ventilation passage and the intake pipe, when the engine is in the first load state When the air in the crankcase enters the intake manifold through the first ventilation channel and prevents air from entering the intake manifold; when the engine is in the second load state and the intake manifold is in a positive pressure state, the crankshaft The gas in the box enters the oil-air separator and then enters the intake pipe through the second ventilation channel and the one-way valve, and the air can enter the intake pipe. The channel enters the engine to realize the air supply function, that is, the integration of the air supply and the first ventilation channel can be realized, the structure is simple, and the cost is saved. In addition, the gas in the intake manifold can be heated by setting the heating channel, and the heated gas enters the engine through the first ventilation channel, which can absorb water vapor in the engine and avoid water accumulation in the engine.

Based on the same inventive concept, an embodiment of the present invention also provides a crankcase ventilation method, and FIG. 2 is a schematic flowchart of a crankcase ventilation method provided by an embodiment of the present invention. As shown in Figure 2, the crankcase ventilation method provided by the embodiment of the present invention may include:

S101. When the engine is in the first load state, output the first control signal to control the double one-way valve to be in the first communication state and control the one-way valve to close, so that the gas in the crankcase passes through the first ventilation channel and the double one-way valve into the intake manifold.

Exemplarily, the first load state may be that the engine is in a light load condition. The first control signal may be a signal output by the controller for controlling the double one-way valve to be in the first communication state and controlling the one-way valve to be closed.

Specifically, referring to FIG. 1, when the engine is in the first load state, the controller controls the double check valve 700 to be in the first communication state and controls the check valve 800 to shut off, so that the gas in the crankcase 100 enters the oil-gas separator 200 and then Through the first ventilation passage 300 and the dual one-way valve 700 into the intake manifold 600 , it is understood that since the one-way valve 800 is closed, air can be prevented from entering the intake manifold 600 .

S102. When the engine is in the second load state and the intake manifold is in the positive pressure state, output the second control signal to control the double check valve to be in the second communication state and control the conduction of the check valve so that the gas in the crankcase can pass through The second ventilation passage and the one-way valve enter the intake pipe, and the first ventilation passage is carried out through the double one-way valve; wherein, the load amount of the first load state is smaller than the load amount of the second load state.

Exemplarily, the second load state may be that the engine is in a heavy load condition. The second control signal may be a signal output by the controller for controlling the double one-way valve to be in the second communication state and controlling the conduction of the one-way valve.

Specifically, referring to FIG. 1 , when the engine is in the second load state and the intake manifold 600 is in the positive pressure state, the controller controls the double check valve 700 to be in the second communication state and controls the check valve 800 to conduct, so that the crankshaft The gas in the tank 100 enters the oil-gas separator 200 and then enters the intake pipe 500 through the second ventilation channel 400 and the one-way valve 800. It can be understood that the air can enter the intake pipe 500, and the gas in the crankcase 100 is mixed with the air and then enters the intake air. The manifold 600 enters the engine through the first ventilation passage 300 through the double check valve 700, so that when the engine is under heavy load and the intake manifold is under positive pressure, the controller can control the double check valve 700 to be in the second communication State, that is, the function of supplementing the crankcase ventilation system with air through the double one-way valve can be realized.

In the crankcase ventilation method provided by the embodiments of the present invention, when the engine is in the first load state, the gas in the crankcase enters the intake manifold through the first ventilation channel and can prevent air from entering the intake manifold; When the load state and the intake manifold is in a positive pressure state, the gas in the crankcase enters the oil-air separator and then enters the intake pipe through the second ventilation channel and the check valve, and the air can enter the intake pipe, and the gas in the crankcase is mixed with air and enters The intake manifold enters the engine from the first ventilation channel through the double check valve to realize the air supply function, that is, the integration of the air supply and the first ventilation channel can be realized, the structure is simple, and the cost is saved.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, readjustments, mutual combinations and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. The crankcase ventilation system is characterized by comprising a crankcase, an oil-gas separator, a first ventilation channel, a second ventilation channel, an air inlet pipe, an air inlet manifold, a double check valve, a check valve and a controller:

the oil-gas separator is respectively communicated with the first ventilation channel and the second ventilation channel;

the double one-way valve is arranged in an air path between the first ventilation channel and the air inlet manifold;

the one-way valve is arranged in a gas path between the second ventilation channel and the gas inlet pipe;

the controller is respectively electrically connected with the double check valve and the check valve and is used for controlling the double check valve to be in a first communication state and controlling the check valve to be closed when the engine is in a first load state, so that gas in a crankcase enters the intake manifold through the first ventilation channel and the double check valve; the double check valve is controlled to be in a second communication state and the check valve is controlled to be communicated when the engine is in a second load state and the intake manifold is in a positive pressure state, so that gas in the crankcase enters the intake pipe through the second ventilation passage and the check valve and enters the first ventilation passage through the double check valve; wherein the load amount of the first load state is smaller than the load amount of the second load state.

2. The crankcase ventilation system of claim 1, further comprising an air filter;

the air filter is communicated with the air inlet pipe.

3. The crankcase ventilation system of claim 1, further comprising a heating passage;

the heating channel is communicated with the air outlet of the air inlet manifold.

4. The crankcase ventilation system of claim 3, wherein the heating passage is integrally disposed within the first ventilation passage.

5. The crankcase ventilation system of claim 1, wherein the double check valve is integrally disposed in the first ventilation passage.

6. The crankcase ventilation system of claim 1, wherein the check valve is integrally disposed in the intake tube.

7. The crankcase ventilation system of claim 1, further comprising a pressure control valve;

the pressure control valve is arranged on the oil-gas separator in an integrated mode, and gas in the crankcase enters the first ventilation channel or the second ventilation channel through the pressure control valve.

8. The crankcase ventilation system of claim 1, further comprising a pressure sensor;

the pressure sensor is arranged on the intake manifold and is configured to detect a pressure value in the intake manifold;

the controller is electrically connected with the pressure sensor and used for monitoring the working state of the crankcase ventilation system according to the pressure value.

9. The crankcase ventilation system of claim 1, further comprising a supercharger and a throttle body;

the supercharger and the throttle body are provided on a connection passage between the intake pipe and the intake manifold.

10. A crankcase ventilation method applied to the crankcase ventilation system according to any one of claims 1-9, comprising:

when the engine is in a first load state, outputting a first control signal to control the double one-way valve to be in a first communication state and control the one-way valve to be closed, so that gas in a crankcase enters the intake manifold through the first ventilation channel and the double one-way valve;

when the engine is in a second load state and the intake manifold is in a positive pressure state, outputting a second control signal to control the double one-way valve to be in a second communication state and control the one-way valve to be conducted, so that gas in the crankcase enters the intake pipe through the second ventilation passage and the one-way valve, and the first ventilation passage is conducted through the double one-way valve; wherein the load amount of the first load state is smaller than the load amount of the second load state.

Images