CN208236478U - crankcase ventilation system and automobile with the crankcase ventilation system - Google Patents

Abstract

A crankcase ventilation system and an automobile. The crankcase ventilation system includes a crankcase, an oil-gas separator, a ventilation chamber, an oil return pipe and a full-load breathing pipe. The oil-gas separator is installed on the cylinder head body, and the ventilation chamber communicates with the crankcase and Oil-air separator, the oil return pipe is connected between the bottom end of the oil-air separator and the engine oil pan, the full-load breathing pipe is set independently of the cylinder head body, one end is connected with the air outlet of the oil-air separator, and the other end is connected with the air intake system The air intake pipeline connected after the air filter is connected, and a pressure sensor is installed on the oil-air separator to measure the air pressure in the oil-air separator, so as to obtain the air pressure inside the crankcase. Pass it to the on-board ECU to judge whether the full-load breathing tube is abnormal based on the air pressure value. The crankcase ventilation system realizes the real-time monitoring of the engine crankcase pressure, so that the OBD on the car can diagnose the failure of the full-load breathing tube in time.

Description

Crankcase ventilation system and motor vehicle having the crankcase ventilation system

technical field

The utility model relates to the technical field of automobiles, in particular to a crankcase ventilation system and an automobile with the crankcase ventilation system.

Background technique

When the engine is working, the high-pressure combustible mixture and burned gas in the combustion chamber will more or less leak into the crankcase through the gap between the piston group and the cylinder, forming blow-by gas. The components of blow-by gas are unburned fuel gas, water vapor and exhaust gas, etc., which will dilute the engine oil, reduce the performance of the engine oil, and accelerate the oxidation and deterioration of the engine oil; the condensation of water vapor in the engine oil will form sludge and block the oil circuit; exhaust gas The acid gas in the oil is mixed into the lubrication system, which will cause corrosion and accelerated wear of engine parts; the blow-by gas will also make the pressure of the crankcase too high and destroy the seal of the crankcase, causing the oil to leak. Therefore, in order to prevent excessive crankcase pressure, prolong the service life of engine oil, reduce wear and corrosion of parts, prevent engine oil leakage and improve fuel economy, a ventilation system must be configured for the crankcase. As a key part of the crankcase ventilation system, the oil-air separator is mainly responsible for separating the oil droplets in the blow-by gas, so as to prevent this part of the oil from entering the combustion supply system directly with the crankcase ventilation system, which will cause combustion and emission deterioration, and at the same time make the separation The last gas containing fuel gas enters the combustion chamber along with the intake passage for combustion.

At present, my country's laws and regulations on emission standards are becoming increasingly strict. In the sixth stage of my country's new automobile emission standard regulations, in addition to reducing the relevant emission limits, the OBD (On-Board Diagnostic, on-board diagnostic system) regulations have also been enhanced. Strict, more prominent diagnosis of timeliness of this requirement. Most of the existing crankcase ventilation systems introduce the separated gas containing fuel gas into the intake system and then into the combustion chamber for combustion by externally connecting the gas flow pipe at the gas outlet end of the oil-gas separator. The external gas circulation pipeline is set independently from the cylinder head, one end communicates with the oil-gas separator, and the other end communicates with the intake manifold or the intake pipeline after the air filter, so there is a possibility that the gas circulation pipeline is disconnected by external force Possibility of causing direct discharge of fuel vapor-containing gases to the atmosphere. In this regard, the existing crankcase ventilation system does not have the function of real-time monitoring, and OBD cannot diagnose the failure of "disconnected gas circulation pipeline" in time, and cannot meet the "Light Vehicle Pollutant Emission Limits and Measurement Methods (China No. The OBD detection requirements in "Six Stages)".

Utility model content

The purpose of this utility model is to solve the deficiencies of the prior art, to provide a crankcase ventilation system and an automobile with the crankcase ventilation system. Diagnose the leakage of the breathing pipe of the crankcase ventilation system in time.

In order to achieve the above object, the technical solution of the utility model is achieved in that:

A crankcase ventilation system described in the utility model includes a crankcase, an oil-gas separator, a ventilation chamber, an oil return pipe and a full-load breathing pipe. The oil-gas separator is installed on the cylinder head body, and the ventilation chambers are respectively connected to The crankcase and the oil-air separator, the oil return pipe is connected between the bottom end of the oil-air separator and the engine oil pan, the full-load breathing pipe is set independently from the cylinder head body, and one end is connected to The air outlet end of the oil-air separator communicates, and the other end communicates with the air-intake pipeline connected between the air filter and the throttle valve in the intake system, and a pressure sensor is installed on the oil-air separator to measure the The air pressure in the oil-gas separator, so as to obtain the air pressure inside the crankcase, the pressure sensor is connected with the vehicle-mounted ECU to transmit the air pressure value of the crankcase to the vehicle-mounted ECU for judging the Whether the full load breathing tube is abnormal.

The crankcase ventilation system provided by the utility model is equipped with a pressure sensor on the oil-gas separator, which realizes the real-time monitoring of the crankcase pressure and improves the maintainability of the engine test or after sale.

In one embodiment, the crankcase ventilation system further includes a part-load breathing pipe, and the part-load breathing pipe is directly formed inside the cylinder head body.

In one of the embodiments, one end of the part-load breathing tube communicates with the oil-gas separator, and the other end of the part-load breathing tube communicates with the intake air in the air intake system after the intake manifold. Channel connected.

In one of the embodiments, the part-load breathing pipe is provided with a first one-way valve, and when the engine is in a part-load condition, the first one-way valve allows gas to pass through the part from the oil-gas separator. The duty breathing tube flows into the intake channel.

In one of the embodiments, the full-load breathing pipe is provided with a second one-way valve, and when the engine is in full-load condition, the second one-way valve allows gas to flow out from the gas outlet of the oil-gas separator , and flow into the intake circuit through the full-load breathing tube.

In one embodiment, a mount is provided on the outer surface of the oil-gas separator, and the pressure sensor is fixed on the mount of the oil-gas separator by bolts.

According to still another aspect of the present invention, there is provided an automobile comprising the crankcase ventilation system as described above.

The crankcase ventilation system of the automobile provided by the utility model can detect the crankcase pressure in real time. The crankcase ventilation system is connected with the vehicle-mounted ECU. The abnormal situation that the load breathing tube is disconnected solves the need for OBD testing in China's sixth stage in engine development, and meets the requirements of emission standards and regulations for the timeliness of OBD testing.

In one of the embodiments, the automobile includes an on-board diagnostic system, which is connected to the on-board ECU to obtain the real-time air pressure value in the crankcase from the on-board ECU, and the on-board diagnostic system is used to The real-time air pressure value in the crankcase is used to judge whether the full-load breathing tube is abnormal.

In one of the embodiments, the car includes an on-board diagnostic system, the on-board ECU sends the data of the pressure sensor to the CAN bus of the car, and the on-board diagnostic system obtains the data from the CAN bus. The real-time air pressure value in the crankcase, the on-board diagnostic system is used to judge whether the full-load breathing tube is abnormal according to the real-time air pressure value in the crankcase.

Other advantages of the present utility model will be described in detail in the following specific embodiments with reference to the accompanying drawings.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model.

In the attached picture:

Fig. 1 is the structural representation of an embodiment of the utility model crankcase ventilation system;

Fig. 2 is a structural schematic diagram of the oil-air separator in the crankcase ventilation system shown in Fig. 1 .

Explanation of reference numerals: 11, crankcase 13, oil-gas separator 131, mounting seat 135, bolt 15, ventilation chamber 17, oil return pipe 191, full-load breathing pipe 193, part-load breathing pipe 195, first one-way valve 197, Second check valve 211, cylinder head body 213, cylinder block body 215, engine oil pan 23, pressure sensor 25, vehicle ECU 271, intake manifold 273, intake passage 275, air filter 277, throttle valve 279. Intake pipeline

Detailed ways

In order to further explain the technical solution of the utility model, the utility model will be described in detail below in conjunction with the accompanying drawings, in which the same reference numerals represent the same components.

The utility model provides a crankcase ventilation system. The crankcase ventilation system in one embodiment includes a crankcase 11, an oil-gas separator 13, a ventilation cavity 15, an oil return pipe 17, a full-load breathing pipe 191 and a part-load breathing pipe 193. As shown in Figure 1, the direction of the arrow in Figure 1 represents the gas flow direction, the oil-gas separator 13 is installed on the cylinder head body 211, the ventilation chamber 15 is integrated inside the cylinder block body 213 and the cylinder head body 211, and one end is connected to the crankcase 11, and the other end communicates with the oil-gas separator 13, so that the gas in the crankcase 11 is introduced into the oil-gas separator 13. Connected, the oil return pipe 17 is integrated inside the cylinder head body 211 and the cylinder block body 213, one end is connected to the bottom end of the oil-gas separator 13, and the other end leads to the engine oil pan 215 to separate the oil-gas separator 13 to obtain Oil droplets of the engine oil are recovered to the engine oil pan 215; one end of the full-load breathing pipe 191 and the part-load breathing pipe 193 are respectively communicated with the oil-gas separator 13, and the other end is communicated with the engine air intake system, so as to separate the air under different working conditions. The final gas with fuel gas is introduced into the intake system of the engine. In this embodiment, the pressure sensor 23 for detecting the internal air pressure of the oil-gas separator 13 is installed on the oil-gas separator 13. As shown in FIG. Fixed on the mounting base 131 of the oil-gas separator 13 by bolts 135, an opening (not shown) penetrating into the oil-gas separator 13 is provided on the mounting base 131, and the detection end of the pressure sensor 23 separates the oil and gas from the opening. The air pressure in the crankcase 13 is detected. Since the crankcase 11 communicates with the oil-gas separator 13 through the ventilation cavity 15, the air pressure in the crankcase can be monitored in real time. The pressure sensor 23 and the vehicle-mounted ECU25 (Electronic Control Unit, electronic control unit) An electrical connection is established to transmit the monitored crankcase air pressure value to the vehicle-mounted ECU 25 in the form of an electrical signal.

In this embodiment, as shown in Figure 1, the engine intake system includes an air filter 275, an intake pipeline 279, an intake manifold 271 and an intake passage 273 connected in sequence, and the intake pipeline 279 is provided with a joint The valve 277 and the full-load breathing pipe 191 are set independently of the cylinder head body 211, one end communicates with the air outlet of the oil-gas separator 13, and the other end communicates with the intake system connected between the air filter 275 and the throttle valve 277. The intake pipeline 279 communicates; the part-load breathing pipe 193 is directly integrated on the cylinder head body 211, one end communicates with the oil-gas separator 13, and the other end communicates with the intake passage 273 connected behind the intake manifold 271 in the intake system . After the part-load breathing pipe 193 is arranged inside the cylinder head body 211, the situation that the gas with fuel gas is directly discharged into the atmosphere due to the disconnection of the part-load breathing pipe 193 is effectively avoided.

In this embodiment, the part-load breathing tube 193 is provided with a first one-way valve 195 to limit gas flow from the oil-gas separator 13 to the intake channel 273 behind the intake manifold 271, and the full-load breathing tube 191 is provided with a second one-way valve 197 to limit gas from only flowing from the oil-air separator 13 to the intake pipeline 279 between the air filter 275 and the throttle valve 277 . When the engine is in a part-load condition, the opening of the throttle valve 277 is relatively small, and there is a negative pressure in the intake manifold 271. The air pressure in the part-load breathing pipe 193 is greater than the air pressure in the intake manifold 271. The gas enters the intake passage 273 behind the intake manifold 271 from the part-load breathing pipe 193 through the first one-way valve 195, and enters the combustion chamber together with the gas in the intake passage 273 for combustion. At the same time, the full-load The second one-way valve 197 on the breathing tube 191 is closed to prevent the gas in the intake line 279 from flowing back into the full-load breathing tube 191 , and the air pressure in the full-load breathing tube 191 is consistent with that in the oil-gas separator 13 . When the engine was in a full-load working condition, the intake manifold 271 was under positive pressure, and the air pressure in the part-load breathing pipe 193 was lower than the air pressure in the intake manifold 271. At this moment, the first one-way valve 195 was closed to stop the air intake. The high-pressure gas in the gas manifold 271 flows back into the part-load breathing pipe 193, and the gas in the oil-gas separator 13 enters the intake pipe 279 behind the air filter 275 from the full-load breathing pipe 191 through the second one-way valve 197 , enter the combustion chamber together with the gas in the intake pipeline 279 for combustion, and at this moment, the air pressure in the full-load breathing pipe 191 is consistent with that in the oil-gas separator.

The air pressure value in the oil-air separator 13 represents the air pressure value in the crankcase 11 between the oil-air separator 13 and the crankcase 11, and the pressure sensor 23 on the oil-air separator 13 detects the oil-air separator 13 The air pressure at the air outlet is used to monitor the pressure change in the crankcase 11 in real time, and the monitored information is transmitted to the vehicle-mounted ECU 25 in the form of electrical signals. As shown in Figure 1, the full-load breathing pipe 191 is set independently from the cylinder head body 211, and is drawn from the gas outlet of the oil-gas separator 13. When the crankcase ventilation system is running normally, the air pressure in the full-load breathing pipe 191 is the same Consistent in the oil-gas separator 13, the air pressure value detected by the pressure sensor 23 at the outlet end of the oil-gas separator 13 is a value within the normal range; The opening is directly connected to the atmosphere, and the gas with fuel gas is directly discharged into the atmosphere from the disconnection. At this time, the air pressure in the full-load breathing tube 191 is one atmosphere, which is affected by the disconnection of the full-load breathing tube 191. The air pressure of the oil-gas separator 13 also becomes an atmospheric pressure, and is detected by the pressure sensor 23 . In this way, the abnormal pressure caused by the disconnection of the full-load breathing tube 191 will be detected by the pressure sensor 23 and transmitted to the vehicle-mounted ECU 25 in time, and the vehicle-mounted ECU 25 will transmit the abnormal value of the air pressure to the vehicle-mounted diagnostic system in real time directly or through the CAN bus of the vehicle (OBD), the on-board diagnostic system can diagnose in time the exhaust fault that the full-load breathing tube 191 is disconnected. In this embodiment, the on-board diagnostic system obtains the real-time air pressure value of the crankcase from the CAN bus.

The crankcase ventilation system provided by the utility model is equipped with a pressure sensor on the oil-gas separator. On the one hand, the real-time monitoring of the crankcase pressure is realized, and the maintainability of the engine test or after-sales is improved; The demand for OBD detection in China's sixth stage enables OBD to diagnose the abnormal situation of full-load breathing tube disconnection in a timely manner, which meets the requirements of emission standards and regulations for the timeliness of OBD detection; at the same time, the solution is convenient and easy to implement, which is conducive to saving cost.

The above is only a specific embodiment of the present utility model. It should be pointed out that any changes or replacements that can be easily imagined by those skilled in the art within the technical scope disclosed in the present utility model should be covered by the present utility model. within the scope of protection.

Claims (9)

1. a kind of crankcase ventilation system, including crankcase (11), gs-oil separator (13), vented cavity (15), oil return pipe (17) With full load respiratory siphon (191), the gs-oil separator (13) is mounted on cylinder head ontology (211), the vented cavity (15) It is respectively communicated with the crankcase (11) and the gs-oil separator (13), the oil return pipe (17) is connected to the gs-oil separator (13) between bottom end and engine sump tank (215), which is characterized in that the full load respiratory siphon (191) is independently of the gas Cylinder cap ontology (211) and be arranged, one end is connected to the outlet side of the gs-oil separator (13), in the other end and gas handling system The air inlet pipeline (279) being connected between air cleaner (275) and air throttle (277) is connected to, the gs-oil separator (13) On pressure sensor (23) is installed to measure the air pressure in the gs-oil separator (13), to obtain the crankcase (11) internal air pressure, the pressure sensor (23) are connect to transmit the atmospheric pressure value of the crankcase with vehicle-mounted ECU (25) To the vehicle-mounted ECU (25) for judging whether the full load respiratory siphon (191) is abnormal according to the atmospheric pressure value.

2. crankcase ventilation system as described in claim 1, which is characterized in that the crankcase ventilation system further includes part Load respiratory siphon (193), it is internal that the sub-load respiratory siphon (193) is formed directly into the cylinder head ontology (211).

3. crankcase ventilation system as claimed in claim 2, which is characterized in that the one of the sub-load respiratory siphon (193) End is connected to the gs-oil separator (13), in the other end of the sub-load respiratory siphon (193) and the gas handling system Inlet channel (273) connection being connected to after inlet manifold (271).

4. crankcase ventilation system as claimed in claim 3, which is characterized in that set on the sub-load respiratory siphon (193) There are the first check valve (195), when engine is in partial load condition, first check valve (195) allows gas from institute It states gs-oil separator (13) and flows into the inlet channel (273) through the sub-load respiratory siphon (193).

5. crankcase ventilation system as described in claim 1, which is characterized in that the full load respiratory siphon (191) is equipped with Second one-way valve (197), when engine is in full load mode, the second one-way valve (197) allows gas from the oil The outlet side of gas separating device (13) is flowed out, and flows into the air inlet pipeline (279) through the full load respiratory siphon (191).

6. crankcase ventilation system as described in claim 1, which is characterized in that on the outer surface of the gs-oil separator (13) Equipped with mounting base (131), the pressure sensor (23) is fixed on the described of the gs-oil separator (13) by bolt (135) In mounting base (131).

7. a kind of automobile, which is characterized in that including crankcase ventilation system as claimed in any one of claims 1 to 6.

8. automobile as claimed in claim 7, which is characterized in that the automobile includes onboard diagnostic system, onboard diagnostic system It is connect with the vehicle-mounted ECU (25) to obtain the real-time atmospheric pressure value in the crankcase (11) from the vehicle-mounted ECU (25), it is described Onboard diagnostic system is used to whether judge the full load respiratory siphon (191) according to the real-time atmospheric pressure value in the crankcase (11) It is abnormal.

9. automobile as claimed in claim 8, which is characterized in that the automobile includes onboard diagnostic system, the vehicle-mounted ECU (25) it sends the data of the pressure sensor (23) in the CAN bus of the automobile, the onboard diagnostic system is from institute The real-time atmospheric pressure value obtained in the crankcase (11) in CAN bus is stated, the onboard diagnostic system is used for according to the crankshaft Real-time atmospheric pressure value in case (11) judges whether the full load respiratory siphon (191) is abnormal.