Engine intake temperature control method and structure

Abstract

The present invention discloses an engine intake temperature control method, which belongs to the field of engine technology and solves the problem that it is difficult for a traditional intercooler to control the temperature of the gas after intercooling. The method is to take air from the intake pipe after intercooling to the thermostat; when the gas entering the thermostat is low-temperature gas, the thermostat closes the cooling water channel, so that the cooling water cannot enter the intercooler, and the intercooler loses its cooling effect on the gas; when the gas entering the thermostat is high-temperature gas, the thermostat opens the cooling water channel, so that the cooling water enters the intercooler, and the intercooler speeds up the cooling of the gas, thereby achieving control of the gas temperature after intercooling to be stable and avoiding the generation of condensed water after intercooling. The present invention also discloses an engine intake temperature control structure, which can realize accurate control of the cooling water flow rate and is easy to install and use.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and more particularly to a method and structure for controlling engine intake air temperature. Background Art

[0002] During the use of the engine, in order to improve the power density of the engine, it is necessary to increase the intake volume. For this reason, high-boost intercooled engines are increasingly widely used. The intercooler heat dissipation area of ​​the intercooler engine is fixed, and the theoretical cooling capacity is also basically fixed. The air flow temperature after intercooling is mainly affected by the cooling water flow, temperature, intake temperature, and intake flow. The temperature of the supercharged air before intercooling can reach 200-300°C. When the temperature after intercooling is lower than the ambient dew point temperature, condensed water will begin to precipitate. The higher the air humidity and the more the temperature after intercooling is lower than the dew point temperature, the more condensed water will be produced. If the temperature after intercooling is too low, too much condensed water will accumulate. In the case of mild, it will enter the combustion chamber and crankcase oil pan, causing the oil to become thinner, the lubrication capacity to decrease, the kinematic pair to wear prematurely, rust and corrosion, and other problems. In severe cases, it will even completely fill the combustion chamber during the compression stroke, causing direct damage to the piston and connecting rod. If the temperature after intercooling is too high, it will cause the intake air to expand, resulting in a decrease in the actual intake mass flow rate. At present, the control of intercooler gas temperature is usually carried out by adjusting the cooling water flow rate according to the cooling water temperature after the intercooler. The temperature control process is unstable and cannot meet the requirements of different working environments. Therefore, it is urgent to develop and design a new engine intake temperature control method and structure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. One of its purposes is to provide an engine intake air temperature control method, which uses the temperature of the gas after intercooling to close the loop to control the cooling water flow entering the intercooler, thereby adapting to various operating environmental conditions, controlling the temperature of the gas after intercooling to be stable, and avoiding the generation of condensed water after intercooling.

[0004] The second purpose is to provide an engine intake air temperature control structure, which can realize accurate control of cooling water flow and is easy to install and use.

[0005] The first technical solution of the present invention is as follows:

[0006] A method for controlling the intake air temperature of an engine, the method comprising taking air from an intake pipe after an intercooler to a thermostat;

[0007] When the gas entering the thermostat is low-temperature gas, the thermostat closes the cooling water channel, so that the cooling water cannot enter the intercooler, and the intercooler loses its cooling effect on the gas;

[0008] When the gas entering the thermostat is high-temperature gas, the thermostat opens the cooling water channel to allow cooling water to enter the intercooler, and the intercooler speeds up the cooling of the gas.

[0009] As a further improvement, in this method, the gas taken out from the intercooler rear intake pipe passes through a thermostat and then flows back into the intercooler rear intake pipe.

[0010] Furthermore, the cross-sectional area of ​​the air intake port of the intercooler rear air intake pipe is smaller than the cross-sectional area of ​​the air return port of the intercooler rear air intake pipe.

[0011] Technical solution 2 of the present invention is as follows: an engine intake temperature control structure, including an intercooler and a thermostat, the thermostat is provided with a bypass interface, a water outlet interface and a water filling pipe, the intercooler is connected to the intercooler rear intake pipe, and is characterized in that the air inlet of the thermostat is connected to one end of the intercooler rear intake pipe through a first hose, the air outlet of the thermostat is connected to the other end of the intercooler rear intake pipe through a second hose, the drain outlet of the intercooler is connected to the bypass interface, and the water inlet of the intercooler is connected to the water outlet interface.

[0012] As a further improvement, the thermostat is provided with a water outlet chamber, a bypass chamber and an air flow channel, the air outlet is connected to the air inlet through the air flow channel, the bypass chamber is connected to the drain outlet through a bypass interface, the water filling pipe is connected to the bypass chamber, the water outlet chamber is connected to the water inlet through the water outlet interface, the water filling pipe is connected to the cooling water storage tank, and a flow control component is provided between the bypass chamber and the water outlet chamber.

[0013] Furthermore, the flow control component includes an expansion joint, a valve seat and a flow guide cover, one end of the expansion joint is movably inserted in the valve seat, and the other end of the expansion joint is movably inserted in the air outlet and the air inlet, the expansion joint is connected to the flow guide cover, and a spring sleeved on the expansion joint is provided between the flow guide cover and the valve seat, and both ends of the spring are respectively connected to the flow guide cover and the valve seat.

[0014] Furthermore, the intercooler rear intake pipe is a conical structure with a small diameter at one end and a large diameter at the other end, the air inlet is connected to the smaller diameter portion of the intercooler rear intake pipe, and the air outlet is connected to the larger diameter portion of the intake pipe.

[0015] Furthermore, the drain outlet and the bypass interface are connected via a third hose, and the water inlet and the water outlet interface are connected via a fourth hose.

[0016] Furthermore, the cross-sectional area of ​​the air intake port of the intercooler rear air intake pipe is smaller than the cross-sectional area of ​​the air return port of the intercooler rear air intake pipe.

[0017] Beneficial Effects

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. An engine intake temperature control method of the present invention takes air from an intake pipe after an intercooler, enters a thermostat, and then flows back to the intake pipe after the intercooler. In the thermostat, the principle of thermal expansion and contraction is used. When the gas entering the thermostat is at a low temperature, the expansion joint does not expand and elongate, the guide cover is tightened on the seat cover, and the spring is compressed. At this time, no cooling water enters the intercooler. When the gas entering the thermostat is at a high temperature, the expansion joint expands and elongates, the guide cover moves under the action of the spring and separates from the valve seat cover, the spring is compressed, and cooling water begins to enter the intercooler to accelerate gas cooling, thereby achieving control of the gas temperature after the intercooler to be stable and avoiding the generation of condensed water after the intercooler.

[0020] 2. An engine intake temperature control structure of the present invention takes air at a smaller diameter portion of the intake pipe through a first hose, and connects to a larger diameter portion of the intake pipe through a second hose. The air intake position has a small cross-sectional area and a higher air pressure, while the air return position has a large cross-sectional area and a lower air pressure. The pressure difference drives the gas to flow in the thermostat, so that the gas acts on the expansion joint. The size of the cooling channel opened between the bypass chamber and the water outlet chamber is determined by the structural changes of the expansion joint due to thermal expansion and contraction, thereby controlling the size of the cooling water flow rate, so that the gas temperature after intercooling can be stabilized under regulation, thereby avoiding the generation of condensed water after intercooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the thermostat in the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the thermostat in the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the flow control component in the present invention.

[0025] Among them: 1-intercooler, 2-intake pipe after intercooler, 3-first hose, 4-second hose, 5-thermostat, 6-drain port, 7-water inlet, 8-flow control component, 10-water outlet chamber, 11-bypass chamber, 12-third hose, 13-fourth hose, 14-air flow channel, 51-bypass interface, 52-water outlet interface, 53-water adding pipe, 81-expansion joint, 83-valve seat, 84-flow guide cover. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0027] See also Figure 1-4The present invention provides an engine intake temperature control method, characterized in that the method is to take air from the intake pipe 2 after intercooling to the thermostat 5; when the gas entering the thermostat 5 is low-temperature gas, the thermostat 5 closes the cooling water channel, so that the cooling water cannot enter the intercooler 1, the intercooler 1 loses the cooling effect on the gas, and the temperature after intercooling will rise, avoiding the generation of condensed water after intercooling; when the gas entering the thermostat 5 is high-temperature gas, the thermostat 5 opens the cooling water channel, so that the cooling water enters the intercooler 1, and the intercooler 1 accelerates the cooling of the gas to avoid the phenomenon of intake expansion, resulting in a decrease in the actual intake mass flow rate. In this embodiment, the opening temperature value of the temperature control unit of the thermostat is set by the ECU to 48°C as the critical value of low-temperature gas and high-temperature gas. When the gas temperature is lower than 48°C, it is low-temperature gas, and when the gas temperature is higher than 48°C, it is high-temperature gas.

[0028] Specifically, in the method, the gas taken out from the air intake pipe after the intercooler passes through the thermostat and then flows back into the air intake pipe after the intercooler.

[0029] Preferably, the cross-sectional area of ​​the air intake port of the intercooler rear air intake pipe is smaller than the cross-sectional area of ​​the air return port of the intercooler rear air intake pipe.

[0030] An engine intake temperature control structure includes an intercooler and a thermostat 5. The thermostat 5 is provided with a bypass interface 51, a water outlet interface 52 and a water supply pipe 53. The intercooler 1 is connected to an intake pipe 2. The air inlet 55 of the thermostat 5 is connected to one end of the intake pipe 2 through a first hose 3. The air outlet 54 of the thermostat 5 is connected to the other end of the intake pipe 2 through a second hose 4. The drain port 6 of the intercooler 1 is connected to the bypass interface 51. The water inlet 7 of the intercooler 1 is connected to the water outlet interface 52. The gas after intercooling The air flows from the air inlet 55 to the thermostat 5 through the first hose 3, and then flows back to the air inlet pipe 2 through the second hose 4 through the air outlet 55. The expansion joint 81 of the thermostat expands and contracts according to the temperature of the gas, thereby realizing the opening and closing of the cooling channel of the thermostat controlled by the gas temperature, thereby accurately regulating the temperature of the gas in the exhaust pipe 2 to avoid condensation of the gas after intercooling. The thermostat 5 sets the opening temperature value and the fully open temperature value of the temperature adjustment unit to control the gas temperature after intercooling to be stable.

[0031] Specifically, the thermostat 5 is provided with a water outlet chamber 10, a bypass chamber 11 and an air flow channel 14, the air outlet 54 is connected to the air inlet 55 through the air flow channel 14, the bypass chamber 11 is connected to the drain port 6 through the bypass interface 51, the water supply pipe 53 is connected to the bypass chamber 11, the water outlet chamber 10 is connected to the water inlet 7 through the water outlet interface 52, the water supply pipe 53 is connected to the cooling water storage tank, and a flow control component 8 is provided between the bypass chamber 11 and the water outlet chamber 10. Compared with the traditional thermostat 5, the overall volume is smaller and more conducive to optimized arrangement in a narrow space. When the gas temperature is too high, the expansion joint 81 expands and stretches, the guide cover 84 moves under the force of the spring 85 and separates from the valve seat 83, the bypass chamber 11 is connected to the water outlet chamber 10, and the cooling water in the bypass chamber 11 enters the water outlet chamber 10 from the separation point. At this time, the cooling water can enter the intercooler 1, and the intercooler 1 starts to work to accelerate the gas cooling.

[0032] Preferably, the flow control assembly 8 includes an expansion joint 81, a valve seat 83 and a guide cover 84. One end of the expansion joint 81 is movably inserted in the valve seat 83, and the other end of the expansion joint 81 is movably inserted in the air outlet 54 and the air inlet 55. The expansion joint 81 is connected to the guide cover 84. A spring 85 sleeved on the expansion joint 81 is provided between the guide cover 84 and the valve seat 83. The two ends of the spring 85 are respectively connected to the guide cover 84 and the valve seat 83. When the gas entering the thermostat 5 is at a low temperature, the expansion joint 81 does not expand and elongate. The protruding block of the expansion joint 81 clamps the valve seat 83, the spring 85 is compressed, the cooling water cannot enter the water outlet chamber 10 through the water supply chamber 9, and the cooling water cannot enter the intercooler 1, and the cooling effect on the gas is lost. When the gas entering the thermostat is high temperature, the expansion joint 81 expands and stretches, and the guide cover 84 moves under the force of the spring 85 and separates from the valve seat 83. At this time, the cooling water in the water supply chamber 9 can enter the water outlet chamber 10, and flow into the intercooler 1 from the water outlet chamber 10, and the intercooler 1 accelerates the cooling of the gas.

[0033] Furthermore, the air intake pipe 2 after the intercooler is a conical structure with a small diameter at one end and a large diameter at the other end. The air inlet 55 is connected to the smaller diameter part of the air intake pipe 2, and the air outlet 54 is connected to the larger diameter part of the air intake pipe 2. The air pressure is high at the smaller diameter part and low at the larger diameter part, and the pressure difference drives the gas to flow rapidly.

[0034] Furthermore, the drain outlet 6 and the bypass interface 51 are connected via a third hose 12, and the water inlet 7 and the water outlet interface 52 are connected via a fourth hose 13. The hose connection facilitates installation and fixation and can meet different installation environment requirements.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A structure for implementing an engine intake temperature control method, the structure comprising an intercooler (1) and a thermostat (5), the thermostat (5) being provided with a bypass interface (51), a water outlet interface (52) and a water supply pipe (53), the intercooler (1) being connected to an intercooler rear intake pipe (2), characterized in that: The air inlet (55) of the thermostat (5) is connected to one end of the intercooler rear air intake pipe (2) through a first hose (3), the air outlet (54) of the thermostat (5) is connected to the other end of the intercooler rear air intake pipe (2) through a second hose (4), the water outlet (6) of the intercooler (1) is in communication with the bypass interface (51), the water inlet (7) of the intercooler (1) is in communication with the water outlet interface (52), the thermostat (5) is provided with a water outlet chamber (10), a bypass chamber (11) and an air flow channel (14), the air outlet (54) and the air inlet (55) are connected through the air flow channel (14). ), the bypass chamber (11) is connected to the drain port (6) via the bypass interface (51), the water supply pipe (53) is connected to the bypass chamber (11), the water outlet chamber (10) is connected to the water inlet (7) via the water outlet interface (52), the water supply pipe (53) is connected to the cooling water storage tank, a flow control component (8) is provided between the bypass chamber (11) and the water outlet chamber (10), the drain port (6) and the bypass interface (51) are connected via a third hose (12), and the water inlet (7) and the water outlet interface (52) are connected via a fourth hose (13); The method comprises taking air from the intercooler rear intake pipe (2) into the thermostat (5); when the gas entering the thermostat (5) is low-temperature gas, the thermostat (5) closes the cooling water channel so that the cooling water cannot enter the intercooler (1), and the intercooler (1) loses its cooling effect on the gas; When the gas entering the thermostat (5) is high-temperature gas, the thermostat (5) opens the cooling water channel to allow cooling water to enter the intercooler (1), and the intercooler (1) accelerates the cooling of the gas; In the method, the gas taken out from the intercooler rear intake pipe (2) passes through a thermostat (5) and then flows back into the intercooler rear intake pipe (2); the cross-sectional area of ​​the air intake port of the intercooler rear intake pipe (2) is smaller than the cross-sectional area of ​​the air return port of the intercooler rear intake pipe (2).

2. The structure for implementing the engine intake temperature control method according to claim 1, characterized in that: The flow control assembly (8) comprises an expansion joint (81), a valve seat (83) and a flow guide cover (84); one end of the expansion joint (81) is movably inserted into the valve seat (83); the other end of the expansion joint (81) is movably inserted into the air outlet (54) and the air inlet (55); the expansion joint (81) is connected to the flow guide cover (84); a spring (85) sleeved on the expansion joint (81) is provided between the flow guide cover (84) and the valve seat (83); two ends of the spring (85) are respectively connected to the flow guide cover (84) and the valve seat (83).

3. The structure for implementing the engine intake temperature control method according to claim 1, characterized in that: The intercooler rear air intake pipe (2) is a tapered structure with a small diameter at one end and a large diameter at the other end; the air intake port (55) is connected to the smaller diameter portion of the intercooler rear air intake pipe (2), and the air outlet port (54) is connected to the larger diameter portion of the air intake pipe (2).

4. The structure for implementing the engine intake temperature control method according to claim 1, characterized in that: The cross-sectional area of ​​the air intake port of the intercooler rear air intake pipe (2) is smaller than the cross-sectional area of ​​the air return port of the intercooler rear air intake pipe (2).

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