Variable flow distribution control device and method for engine cylinder head water jacket

Abstract

The present invention relates to a variable flow distribution control device and method for an engine cylinder head water jacket. The variable flow distribution control device is arranged on the connection part of the upper and lower water jackets of the engine cylinder head, and comprises a spring seat and a shell. The spring seat is embedded on the cylinder head, and a spring is arranged on the spring seat. The spring is fixedly connected to an adjusting piston. A shell is arranged outside the adjusting piston. A high-pressure air chamber is arranged between the shell and the adjusting piston, and an air inlet connected to the high-pressure air chamber is arranged on the shell. The high-pressure air chamber directly formed by the shell and the adjusting piston provides different driving pressures according to working conditions under the action of an external high-pressure gas pressure regulating control system to adjust the stroke and position of the piston; different regulating piston positions change the connecting cross-sectional area of ​​the upper and lower water jackets, thereby adjusting the distribution of water flow of the upper and lower water jackets.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a variable flow distribution control device and method for a water jacket of a cylinder head of an engine. Background Art

[0002] At present, the cooling of automobile engine cylinder heads is basically water-cooled, and with the increase in engine power, the engine cylinder head water jacket structure generally adopts the form of upper and lower water jackets. However, at present, the upper and lower water jacket structures of the engine cylinder head are fixed, and the flow distribution ratio of different parts of the water jacket cannot be changed and adjusted regardless of the engine operating conditions, resulting in a fixed water flow distribution of the water jacket, which cannot be adaptively adjusted according to the requirements of different operating conditions. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a variable flow distribution control device and method for an engine cylinder head water jacket, which can adjust the flow distribution between the upper and lower water jackets according to the engine operating conditions.

[0004] The technical solution adopted by the present invention is: a variable flow distribution control device for the water jacket of an engine cylinder head, characterized in that: it is arranged on the connecting part of the upper and lower water jackets of the engine cylinder head, includes a spring seat and a shell, the spring seat is embedded in the cylinder head, a spring is provided on the spring seat, the spring is fixedly connected to the regulating piston, the regulating piston outer sleeve is provided with a shell, a high-pressure air chamber is provided between the shell and the regulating piston, and an air inlet connected to the high-pressure air chamber is provided on the shell.

[0005] Preferably, the spring seat is embedded in the sand core of the cylinder head casting in the form of a cold insert, and is integrated with the internal structure of the cylinder head after casting to form a whole.

[0006] Preferably, the housing is mounted on the cylinder head by means of threads.

[0007] Preferably, the inner wall of the housing and the outer wall of the regulating piston are sealed by an O-ring.

[0008] Preferably, the air inlet is connected to a high-pressure gas cylinder on the vehicle.

[0009] A variable flow distribution control method for a water jacket of a cylinder head of an engine, characterized in that it comprises the following steps:

[0010] S1: The ECU determines the operating condition of the engine by receiving the values ​​of the intake air volume, fuel injection volume, intake air temperature, exhaust temperature and engine speed variables;

[0011] S2: The ECU determines the total water pump flow required by the engine through the engine operating conditions determined in step S1, combined with the received cylinder head water jacket temperature and ambient temperature variables;

[0012] S3: The ECU determines the flow distribution ratio of the upper and lower water jackets of the cylinder head based on the engine operating conditions, the total flow of the water pump, the cylinder head water jacket temperature and the ambient temperature;

[0013] S4: ECU issues a command: controls the variable flow water pump to meet the flow requirement, and controls the opening of the water jacket flow distribution regulating device to meet the flow distribution ratio requirement of the upper and lower water jackets.

[0014] Preferably, the operating conditions include warm-up conditions, rated conditions, idle conditions, high-cold conditions, partial load conditions and different exhaust temperature conditions.

[0015] Preferably, the opening of the variable flow distribution control device under the warm-up condition is 0, the opening of the variable flow distribution control device under the rated condition is 100%, the opening of the variable flow distribution control device under the idle condition is 0, the opening of the variable flow distribution control device under the high-cold condition is 0, the opening of the variable flow distribution control device under the partial load condition is 0-80%, and the opening of the variable flow distribution control device under different exhaust temperature conditions is 0-90%.

[0016] The beneficial effects achieved by the present invention are as follows: the high-pressure gas chamber directly formed by the shell and the regulating piston provides different driving pressures according to working conditions under the action of an external high-pressure gas pressure regulating control system to adjust the stroke and position of the piston; different regulating piston positions change the connecting cross-sectional area of ​​the upper and lower water jackets, thereby adjusting the distribution of water flow in the upper and lower water jackets. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the upper and lower water jackets of the engine cylinder head;

[0018] Figure 2 is a control principle diagram of the control device of the present invention;

[0019] Figure 3 It is a schematic diagram of installing the control device of the present invention on the cylinder head;

[0020] Figure 4 It is a structural schematic diagram of the control device of the present invention;

[0021] Figure 5 This is a schematic diagram of the connection dimensions of the upper and lower water jackets of a cylinder head of an engine;

[0022] Figure 6 Statistical data graph for upper water hole flow distribution;

[0023] Among them: 1. Engine cylinder head; 11. Upper water jacket; 12. Lower water jacket; 13. Upper and lower water jacket connection; 2. Variable flow distribution control device; 21. Spring seat; 22. Spring; 23. Adjusting piston; 24. Housing; 25. O-ring; 26. High-pressure gas chamber; 27. Air inlet; 3. High-pressure gas cylinder; 4. ECU; 5. Variable flow water pump; 6. Pressure regulating valve. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1-4 As shown, a variable flow distribution control device for the water jacket of an engine cylinder head of the present invention is arranged on the upper and lower water jacket connection parts 13 of the engine cylinder head, and includes a spring seat 21 and a housing 24. The spring seat 21 is embedded in the cylinder head 1, and a spring 22 is arranged on the spring seat 21. The spring 22 is fixedly connected to the regulating piston 23. The regulating piston 23 is covered with a housing 24. A high-pressure air chamber 26 is arranged between the housing 24 and the regulating piston 23, and an air inlet 26 connected to the high-pressure air chamber is arranged on the housing 24. The air pressure in the high-pressure air chamber 26 is controlled by the air inlet 26, so that the regulating piston 23 is in different positions, thereby changing the connecting cross-sectional area of ​​the upper water jacket 11 and the lower water jacket 13, thereby adjusting the distribution of the water flow of the upper and lower water jackets.

[0026] Embodiment 1: A variable flow distribution control device for the water jacket of an engine cylinder head is arranged on the upper and lower water jacket connection parts 13 of the engine cylinder head, and comprises a spring seat 21 and a housing 24. The spring seat 21 is embedded in the cylinder head 1, and a spring 22 is arranged on the spring seat 21. The spring 22 is fixedly connected to the regulating piston 23. The regulating piston 23 is covered with a housing 24. A high-pressure air chamber 26 is arranged between the housing 24 and the regulating piston 23, and an air inlet 26 connected to the high-pressure air chamber is arranged on the housing 24. The air pressure in the high-pressure air chamber 26 is controlled by the air inlet 26, so that the regulating piston 23 is in different positions, thereby changing the connecting cross-sectional area of ​​the upper water jacket 11 and the lower water jacket 13, thereby adjusting the distribution of the water flow of the upper and lower water jackets.

[0027] In this embodiment, the spring seat 21 embedded in the cylinder head 1 can be any structural form that does not affect the water flow inside the water jacket. It is pre-embedded in the sand core cast by the cylinder head 1 in the form of a cold plug-in. After pouring, it is integrated with the internal structure of the cylinder head 1 to form a whole. Its specific position is in the water jacket structure of the cylinder head.

[0028] Embodiment 2: A variable flow distribution control device for the water jacket of an engine cylinder head is arranged on the upper and lower water jacket connection parts 13 of the engine cylinder head, and comprises a spring seat 21 and a housing 24. The spring seat 21 is embedded in the cylinder head 1, and a spring 22 is arranged on the spring seat 21. The spring 22 is fixedly connected to the regulating piston 23. The regulating piston 23 is covered with a housing 24. A high-pressure air chamber 26 is arranged between the housing 24 and the regulating piston 23, and an air inlet 26 connected to the high-pressure air chamber is arranged on the housing 24. The air pressure in the high-pressure air chamber 26 is controlled by the air inlet 26, so that the regulating piston 23 is in different positions, thereby changing the connecting cross-sectional area of ​​the upper water jacket 11 and the lower water jacket 13, thereby adjusting the distribution of the water flow of the upper and lower water jackets.

[0029] In this embodiment, the spring seat 21 embedded in the cylinder head 1 can be any structural form that does not affect the water flow inside the water jacket. It is pre-embedded in the sand core cast by the cylinder head 1 in the form of a cold plug-in. After pouring, it is integrated with the internal structure of the cylinder head 1 to form a whole. Its specific position is in the water jacket structure of the cylinder head.

[0030] In this embodiment, the housing 24 is mounted on the cylinder head 1 in the form of threads or a base.

[0031] Embodiment 3: A variable flow distribution control device for the water jacket of an engine cylinder head is arranged on the upper and lower water jacket connection parts 13 of the engine cylinder head, and comprises a spring seat 21 and a housing 24. The spring seat 21 is embedded in the cylinder head 1, and a spring 22 is arranged on the spring seat 21. The spring 22 is fixedly connected to the regulating piston 23. The regulating piston 23 is covered with a housing 24. A high-pressure air chamber 26 is arranged between the housing 24 and the regulating piston 23, and an air inlet 26 connected to the high-pressure air chamber is arranged on the housing 24. The air pressure in the high-pressure air chamber 26 is controlled by the air inlet 26, so that the regulating piston 23 is in different positions, thereby changing the connecting cross-sectional area of ​​the upper water jacket 11 and the lower water jacket 13, thereby adjusting the distribution of the water flow of the upper and lower water jackets.

[0032] In this embodiment, the spring seat 21 embedded in the cylinder head 1 can be any structural form that does not affect the water flow inside the water jacket. It is pre-embedded in the sand core cast by the cylinder head 1 in the form of a cold plug-in. After pouring, it is integrated with the internal structure of the cylinder head 1 to form a whole. Its specific position is in the water jacket structure of the cylinder head.

[0033] In this embodiment, the housing 24 is mounted on the cylinder head 1 in the form of a thread or a base. The inner wall of the housing 24 and the outer wall of the regulating piston 23 are sealed by an O-ring 25.

[0034] Embodiment 4: A variable flow distribution control device for the water jacket of an engine cylinder head is arranged on the upper and lower water jacket connection parts 13 of the engine cylinder head, and comprises a spring seat 21 and a housing 24. The spring seat 21 is embedded in the cylinder head 1, and a spring 22 is arranged on the spring seat 21. The spring 22 is fixedly connected to the regulating piston 23. The regulating piston 23 is covered with a housing 24. A high-pressure air chamber 26 is arranged between the housing 24 and the regulating piston 23, and an air inlet 26 connected to the high-pressure air chamber is arranged on the housing 24. The air pressure in the high-pressure air chamber 26 is controlled by the air inlet 26, so that the regulating piston 23 is in different positions, thereby changing the connecting cross-sectional area of ​​the upper water jacket 11 and the lower water jacket 13, thereby adjusting the distribution of the water flow of the upper and lower water jackets.

[0035] In this embodiment, the spring seat 21 embedded in the cylinder head 1 can be any structural form that does not affect the water flow inside the water jacket. It is pre-embedded in the sand core cast by the cylinder head 1 in the form of a cold plug-in. After pouring, it is integrated with the internal structure of the cylinder head 1 to form a whole. Its specific position is in the water jacket structure of the cylinder head.

[0036] In this embodiment, the housing 24 is mounted on the cylinder head 1 in the form of a thread or a base. The inner wall of the housing 24 and the outer wall of the regulating piston 23 are sealed by an O-ring 25. The air inlet 27 is connected to the high-pressure gas cylinder 3 on the vehicle. Generally, a high-pressure gas cylinder 3 is installed on a vehicle. In order to reduce the cost of the implementation scheme of the present invention and improve the reliability of the device, the present solution uses the high-pressure gas in the high-pressure gas cylinder 3 on the vehicle to adjust the air pressure through the pressure regulating valve 6, thereby adjusting and controlling the variable flow distribution regulating device 2 installed on the cylinder head, so as to achieve the purpose of adjusting the flow distribution of the upper and lower water jackets.

[0037] A variable flow distribution control method for a water jacket of a cylinder head of an engine according to the present invention comprises the following steps:

[0038] S1: The ECU determines the operating condition of the engine (warm-up condition, rated condition, idle condition, high-cold condition, partial load condition, different exhaust temperature conditions) through the received intake air volume, fuel injection volume, intake air temperature, exhaust temperature and engine speed variable values. ;

[0039] S2: The ECU determines the total water pump flow required by the engine through the engine operating conditions determined in step S1, combined with the received cylinder head water jacket temperature and ambient temperature variables;

[0040] S3: The ECU determines the flow distribution ratio of the upper and lower water jackets of the cylinder head based on the engine operating conditions, the total flow of the water pump, the cylinder head water jacket temperature and the ambient temperature;

[0041] S4: ECU issues a command: controls the variable flow water pump to meet the flow requirement, and controls the opening of the water jacket flow distribution regulating device to meet the flow distribution ratio requirement of the upper and lower water jackets.

[0042] The specific control strategies are as follows:

[0043]

[0044] [Note: The above strategies and calculations are based on the design scheme with the same flow rate of the underwater water jacket of the cylinder head]

[0045] Figure 5 The water flow of 7 and 8 accounts for about 20% of the total water flow of the cylinder head. The water flows directly into the exhaust side water jacket and flows to the front end and the upper water jacket. It does not participate in the cooling of key areas. It only needs to be connected when the engine is at full speed and full load. Under other working conditions, the connection hole can be closed to save 20% of the water pump accessory work. Through CFD analysis, the connection and non-connection of 7 and 8 have very little effect on the flow velocity distribution in the nose bridge area of ​​the cylinder head, indicating that the adjustment and change of the flow of the upper and lower water jackets of the engine cylinder head is very meaningful for the fuel saving of the engine. For specific data and results, see Figure 6 .

[0046] The above shows and describes the basic principles and main structural features of the present invention. The present invention is not limited to the above examples. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0047] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A control method for a variable flow distribution control device of an engine cylinder head water jacket, characterized in that: The control device is arranged on the connection part of the upper and lower water jackets of the engine cylinder head, and comprises a spring seat and a shell. The spring seat is embedded in the cylinder head, and a spring is arranged on the spring seat. The spring is fixedly connected to the regulating piston. The outer sleeve of the regulating piston is provided with a shell. A high-pressure air chamber is arranged between the shell and the regulating piston, and an air inlet connected to the high-pressure air chamber is arranged on the shell. The spring seat is pre-buried in the sand core of the cylinder head casting in the form of a cold plug-in, and is integrated with the internal structure of the cylinder head after casting to form a whole. The control method of the control device comprises the following steps: S1: The ECU determines the operating condition of the engine through the received values ​​of the intake air volume, fuel injection volume, intake air temperature, exhaust temperature and engine speed variables; S2: The ECU determines the total water pump flow required by the engine through the engine operating conditions determined in step S1, combined with the received cylinder head water jacket temperature and ambient temperature variables; S3: The ECU determines the flow distribution ratio of the upper and lower water jackets of the cylinder head based on the engine operating conditions, the total flow of the water pump, the cylinder head water jacket temperature and the ambient temperature; S4: ECU issues a command: control the variable flow water pump to meet the flow demand, control the opening of the water jacket flow distribution regulating device to meet the flow distribution ratio requirement of the upper and lower water jackets; the operating conditions include warm-up conditions, rated conditions, idle conditions, high-cold conditions, partial load conditions and different exhaust temperature conditions; the opening of the variable flow distribution control device under the warm-up condition is 0, the opening of the variable flow distribution control device under the rated condition is 100%, the opening of the variable flow distribution control device under the idle condition is 0, the opening of the variable flow distribution control device under the high-cold condition is 0, the opening of the variable flow distribution control device under the partial load condition is 0~80%, and the opening of the variable flow distribution control device under different exhaust temperature conditions is 0~90%.

2. The control method of the variable flow distribution control device of the engine cylinder head water jacket according to claim 1, characterized in that: The housing is mounted on the cylinder head by means of threads.

3. The control method of the variable flow distribution control device of the engine cylinder head water jacket according to claim 1, characterized in that: The inner wall of the housing and the outer wall of the regulating piston are sealed by an O-ring.

4. The control method of the variable flow distribution control device of the engine cylinder head water jacket according to claim 1, characterized in that: The air inlet is communicated with a high-pressure gas cylinder on the vehicle.

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