Supercharged engine assembly and vehicle

Abstract

The invention discloses a supercharged engine assembly and a vehicle. The supercharged engine assembly comprises a Venturi tube, a function channel I and a function channel II. The functional channel I is used for communicating an oil-gas separation gas outlet of the engine to the throat position of the Venturi tube; a diffusion section of the Venturi tube is communicated to the rear side of the air filter and is positioned on the front side of an air inlet of the supercharger; the inlet section of the Venturi tube is communicated to the rear side of the air outlet of the supercharger through a functional channel II; a valve A is arranged on the function channel I, a valve B is arranged on the function channel II, and the valve A and the valve B are controlled to be opened and closed so that the pressure in a crankcase of an engine can be controlled within a preset range. On the premise that the cost can be controlled, the pressure of the crankcase of the supercharged engine can be effectively controlled within a set pressure range through some means.

Description

Technical Field

[0001] The present invention relates to the field of supercharged engines, and in particular to a supercharged engine assembly and a vehicle. Background Art

[0002] At present, the actual leakage of the piston of the industry's engines is always less than the limit value calculated according to the standard; the piston leakage of the supercharged engine is greater than the flow rate of the PCV valve in more than 75% of the working conditions. Therefore, the crankcase pressure of the supercharged engine is greater than the atmospheric pressure in most working conditions, which does not meet the relevant standards for pollutant emissions. When the supercharged engine is installed on a traditional vehicle model, the positive pressure in the crankcase can easily cause oil leakage to the engine's oil seal and other seals. Without using a PCV valve pipe with a diagnostic connector, it is difficult to meet regulatory requirements, the cost is high, and the maintenance is difficult and expensive.

[0003] Therefore, in order to solve the above problems, a supercharged engine assembly and a vehicle are needed, which can effectively control the crankcase pressure of the supercharged engine within a set pressure range by some means while controlling costs. Summary of the invention

[0004] In view of this, an object of the present invention is to overcome the defects in the prior art and provide a supercharged engine assembly and a vehicle, which can effectively control the crankcase pressure of the supercharged engine within a set pressure range by some means under the premise of controlling costs.

[0005] The supercharged engine assembly of the present invention comprises an engine and a crankcase ventilation system, wherein the crankcase ventilation system comprises an air filter, a supercharger and an intake manifold, wherein the supercharger connects the air filter and the intake manifold; the air outlet of the intake manifold connects to the air inlet of the engine located at the cylinder head, and the engine also connects the crankcase chamber of the engine to the intake manifold through a PVC valve; and further comprises an intercooler, wherein the intercooler connects the intake manifold and the supercharger;

[0006] The aforementioned air filter, supercharger, intercooler, intake manifold, and auxiliary connectors and PVC valve connected to the engine are the common structures of the current crankcase forced ventilation system. Any one of the existing technologies can be selected to achieve the intended purpose, and no further description is given here.

[0007] The present scheme also includes a Venturi tube, a functional channel I and a functional channel II; the Venturi tube includes an inlet section, a contraction section, a throat and a diffusion section connected in sequence from front to back; the characteristics of the Venturi tube are used to adjust the pressure in the crankcase within a set range; the functional channel I connects the outlet of the engine oil and gas separation to the throat position of the Venturi tube; the diffusion section of the Venturi tube is connected to the rear side of the air filter, and the diffusion section of the Venturi tube is located at the front side of the supercharger air inlet; the inlet section of the Venturi tube is connected to the rear side of the supercharger air outlet through the functional channel II; the functional channel II is connected to the front side of the intercooler.

[0008] By adding a Venturi tube, the outlet for oil-gas separation is set between the air intake at the front end of the supercharger and the air outlet at the rear end of the supercharger. By utilizing the pressure difference between the front end and the rear end of the supercharger and the low-pressure characteristics of the throat position, the gas in the crankcase is discharged by another ventilation structure other than the PVC valve, so that the pressure in the crankcase is lower than the set pressure, reducing the risk of oil leakage caused by excessive pressure in the crankcase, and solving the problem of high maintenance cost of abnormal crankcase pressure warning;

[0009] The functional channel I is provided with a valve A, and the functional channel II is provided with a valve B, and the opening and closing of the valve A and the valve B are controlled; it also includes a pressure monitoring element provided in the crankcase for monitoring the pressure in the crankcase, and the opening and closing of the valve A and the valve B are controlled by the information feedback from the pressure monitoring element, so that the pressure in the crankcase of the engine is controlled within a preset range. Of course, it also includes a control system for processing the information transmitted by the pressure monitoring element and for controlling the opening and closing of the valve A and the valve B. In this scheme, both valve A and valve B are electronically controlled valves, the pressure monitoring element is a pressure sensor, and the control system is the ECU of the vehicle. It is appropriate to select any one of the existing technologies to achieve the given function, which will not be repeated here; the ECU controls the opening and closing cross-sectional size of the valve A and the valve B by collecting the information feedback from the pressure sensor, so that the pressure in the crankcase is controlled within the set range. More specifically, the pressure in the crankcase is continuously controlled at -5kPa to -2kPa; it reduces the risk of oil leakage caused by excessive pressure in the crankcase, meets the monitoring of the crankcase ventilation system, and can solve the problem of high maintenance cost of abnormal crankcase pressure warning.

[0010] Furthermore, it also includes a functional channel III, which connects the rear side of the supercharger outlet to the intake channel of the engine. More specifically, the functional channel III is connected to the intake channel of the engine located on the cylinder body; a valve controlled to open and close is provided on the functional channel III; through the setting of the functional channel III, fresh air can be added to the crankcase, the water vapor saturation in the crankcase can be reduced, the dilution of the engine oil can be reduced, and the fuel concentration of the recovered exhaust gas can be reduced so that it does not affect the normal combustion of the engine; at the same time, it also has the ability to balance the crankcase pressure to further ensure that the pressure in the crankcase is within the set range and ensure the engine performance;

[0011] In this solution, the valve B is at least a three-way valve, and the three-way valve connects the functional channel II, the functional channel III and the rear side of the supercharger outlet respectively. That is, the functional channel II and the functional channel III are connected together at the same position behind the supercharger outlet through the three-way valve, which can improve the compactness of the wiring and the convenience of adjusting the valve port.

[0012] The present solution also discloses a vehicle based on the supercharged engine assembly, which also includes a control system, wherein the valve A and valve B are both electrically controlled valves, and the control system controls the opening and closing of valve A and valve B by collecting information fed back by the pressure detection element. The ECU controls the opening and closing cross-sectional sizes of valve A and valve B by collecting information fed back by the pressure sensor, so that the pressure in the crankcase is controlled within a set range, reducing the risk of oil leakage caused by excessive pressure in the crankcase, meeting the monitoring of the crankcase ventilation system, and being able to solve the problem of high maintenance costs for abnormal crankcase pressure warnings.

[0013] The beneficial effects of the present invention are as follows: a supercharged engine assembly and a vehicle disclosed in the present invention, through an additional venturi tube, an outlet for oil-gas separation is arranged between the air intake at the front end of the supercharger and the air outlet at the rear end of the supercharger, and the pressure difference between the front end and the rear end of the supercharger and the low-pressure characteristics of the throat position are utilized to discharge the gas in the crankcase by another forced ventilation structure other than the PVC valve, so that the pressure in the crankcase is lower than the set pressure, thereby solving the problem of oil leakage caused by excessive pressure in the crankcase and solving the problem of high maintenance cost of abnormal crankcase pressure warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the venturi tube of the present invention. DETAILED DESCRIPTION

[0017] Figure 1 Schematic diagram of the structure of the present invention, the solid line with arrows in the figure indicates the direction of gas flow, the front is the position where the gas passes first, and the back is the position where the gas passes later, which will not be repeated here; the dotted line in the figure indicates the control line, which is used to transmit the electric control signal to realize the given function, which will not be repeated here; Figure 2Schematic diagram of the structure of the venturi tube of the present invention; as shown in the figure, the supercharged engine assembly in this embodiment includes an engine and a crankcase ventilation system, the crankcase ventilation system includes an air filter, a supercharger and an intake manifold, the supercharger connects the air filter and the intake manifold; the air outlet of the intake manifold is connected to the air intake of the engine located at the cylinder head, and the engine also connects the crankcase chamber of the engine to the intake manifold through a PVC valve; and also includes an intercooler, the intercooler connects the intake manifold and the supercharger;

[0018] The aforementioned air filter, supercharger, intercooler, intake manifold and auxiliary connectors and PVC valve connected to the engine, including the internal air duct of the engine, are the general structure of the current crankcase forced ventilation system. Any one of the existing technologies can be selected to achieve the intended purpose, and no further description is given here.

[0019] The present scheme also includes a venturi tube, a functional channel I and a functional channel II; the venturi tube includes an inlet section 1, a contraction section 2, a throat 3 and a diffusion section 4 which are connected in sequence from front to back; the characteristics of the venturi tube are used to adjust the pressure in the crankcase within a set range; the functional channel I connects the outlet of the engine oil and gas separation to the throat position of the venturi tube; the diffusion section of the venturi tube is connected to the rear side of the air filter, and the diffusion section of the venturi tube is located at the front side of the supercharger air inlet; the inlet section of the venturi tube is connected to the rear side of the supercharger air outlet through the functional channel II; the functional channel II is connected to the front side of the intercooler.

[0020] By adding a Venturi tube, the outlet for oil-gas separation is set between the air intake at the front end of the supercharger and the air outlet at the rear end of the supercharger. By utilizing the pressure difference between the front end and the rear end of the supercharger and the low-pressure characteristics of the throat position, the gas in the crankcase is discharged by another ventilation structure other than the PVC valve, so that the pressure in the crankcase is lower than the set pressure, reducing the risk of oil leakage caused by excessive pressure in the crankcase, and solving the problem of high maintenance cost of abnormal crankcase pressure warning;

[0021] The functional channel I is provided with a valve A, and the functional channel II is provided with a valve B, and the opening and closing of the valve A and the valve B are controlled; it also includes a pressure monitoring element provided in the crankcase for monitoring the pressure in the crankcase, and the opening and closing of the valve A and the valve B are controlled by the information feedback from the pressure monitoring element, so that the pressure in the crankcase of the engine is controlled within a preset range. Of course, it also includes a control system for processing the information transmitted by the pressure monitoring element and for controlling the opening and closing of the valve A and the valve B. In this scheme, both valve A and valve B are electronically controlled valves, the pressure monitoring element is a pressure sensor, and the control system is the ECU of the vehicle. It is appropriate to select any one of the existing technologies to achieve the given function, which will not be repeated here; the ECU controls the opening and closing cross-sectional size of the valve A and the valve B by collecting the information feedback from the pressure sensor, so that the pressure in the crankcase is controlled within the set range. More specifically, the pressure in the crankcase is continuously controlled at -5kPa to -2kPa; it reduces the risk of oil leakage caused by excessive pressure in the crankcase, meets the monitoring of the crankcase ventilation system, and can solve the problem of high maintenance cost of abnormal crankcase pressure warning.

[0022] In this embodiment, a functional channel III is also included, and the functional channel III connects the rear side of the supercharger outlet to the intake channel of the engine. More specifically, the functional channel III is connected to the intake channel of the engine located on the cylinder body; a valve controlled to open and close is arranged on the functional channel III; through the arrangement of the functional channel III, fresh air can be added to the crankcase, the water vapor saturation in the crankcase can be reduced, the dilution of the engine oil can be reduced, and the fuel concentration of the recovered exhaust gas can be reduced so that it does not affect the normal combustion of the engine; at the same time, it also has the ability to balance the crankcase pressure, so as to further ensure that the pressure in the crankcase is within the set range and ensure the engine performance;

[0023] In this embodiment, the valve B is at least a three-way valve, and the three-way valve connects the functional channel II, the functional channel III and the rear side of the supercharger outlet respectively. That is, the functional channel II and the functional channel III are connected together at the same position behind the supercharger outlet through the three-way valve, which can improve the compactness of the wiring and the convenience of adjusting the valve port.

[0024] The present solution also discloses a vehicle based on the supercharged engine assembly, which also includes a control system, wherein the valve A and valve B are both electrically controlled valves, and the control system controls the opening and closing of valve A and valve B by collecting information fed back by the pressure detection element. The ECU controls the opening and closing cross-sectional sizes of valve A and valve B by collecting information fed back by the pressure sensor, so that the pressure in the crankcase is controlled within a set range, reducing the risk of oil leakage caused by excessive pressure in the crankcase, meeting the monitoring of the crankcase ventilation system, and being able to solve the problem of high maintenance costs for abnormal crankcase pressure warnings.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A supercharged engine assembly, characterized in that: The invention comprises an engine and a crankcase ventilation system, wherein the crankcase ventilation system comprises an air filter, a supercharger and an intake manifold, wherein the supercharger connects the air filter and the intake manifold; the air outlet of the intake manifold is connected to the air intake of the engine located at the cylinder head, and the engine also connects the crankcase chamber of the engine to the intake manifold through a PVC valve; It also includes a venturi tube, a functional channel I and a functional channel II; the functional channel I connects the outlet of the engine oil-gas separation to the throat position of the venturi tube; the diffuser section of the venturi tube is connected to the rear side of the air filter, and the diffuser section of the venturi tube is located at the front side of the supercharger air inlet; the inlet section of the venturi tube is connected to the rear side of the supercharger outlet through the functional channel II; The functional channel I is provided with a valve A, and the functional channel II is provided with a valve B. The valves A and B are controlled to open and close so that the pressure in the crankcase of the engine is controlled within a preset range.

2. The supercharged engine assembly according to claim 1, characterized in that: It also includes a pressure monitoring element arranged in the crankcase for monitoring the pressure in the crankcase. The opening and closing of valve A and valve B are controlled by information fed back by the pressure monitoring element so that the pressure in the crankcase of the engine is controlled within a preset range.

3. The supercharged engine assembly and vehicle according to claim 1, characterized in that: It also includes a functional channel III, which connects the rear side of the supercharger outlet to the intake channel of the engine, and a valve whose opening and closing is controlled is arranged on the functional channel III.

4. The supercharged engine assembly according to claim 3, characterized in that: The valve B is at least a three-way valve, which connects the functional channel II, the functional channel III and the rear side of the supercharger outlet respectively.

5. The supercharged engine assembly according to claim 1, characterized in that: It also includes an intercooler, which connects the intake manifold and the supercharger, and the functional channel II is connected to the front side of the intercooler.

6. The supercharged engine assembly according to claim 4, characterized in that: The functional channel III is connected to the intake channel of the engine located on the cylinder block.

7. A vehicle based on the supercharged engine assembly according to any one of claims 2 to 6, characterized in that: It also includes a control system, wherein the valve A and valve B are both electrically controlled valves, and the control system controls the opening and closing of valve A and valve B by collecting information fed back by the pressure detection element.

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