CN105804827A - Piezoelectrically-controlled pressure-intensified valve system - Google Patents

Abstract

The object of the present invention is to provide a piezo-electrically controlled pressurized gas distribution system, including a hydraulic oil rail, a piezo-electrically controlled part, a pressurized piston, a control piston, a valve body, a valve, a casing and the like. The invention adopts the hydraulic oil rail to significantly reduce the opening and closing instability of the valve caused by the pressure fluctuation in the system, and ensures the reliability and consistency of the operation of the gas distribution system; In the oil circuit, the booster piston is used to pressurize the hydraulic oil in the booster chamber, so as to realize the on-off between the valve and the vent port, which can effectively control the gas distribution timing and gas distribution duration angle; directly drive the ball valve through the piezoelectric stack, which can Flexible and precise control of gas distribution rules is conducive to the realization of flexible gas distribution methods under different working conditions of internal combustion engines, which significantly improves the degree of freedom of valve control, can further improve fuel economy and internal combustion engine emissions, and is conducive to improving the dynamic performance of internal combustion engines.

Description

Piezoelectric control booster gas distribution system

technical field

The invention relates to an internal combustion engine, in particular to a gas distribution system of the internal combustion engine.

Background technique

The main function of the gas distribution device of the internal combustion engine is to discharge the burned exhaust gas out of the cylinder within the specified time, and to inhale a sufficient amount of fresh air. The impact is significant. The patent application number is 200510041311.3 discloses an electric control valve actuator, which consists of a housing, an electromagnetic device at the bottom of the housing, a stroke adjustment screw passing through the axial center through hole of the electromagnetic device, and a gap between the upper end of the stroke adjustment screw and the inner top of the housing. The provided noise-canceling spring constitutes, the invention adopts the electromagnetic switch to directly control the opening and closing of the valve, the structure of the actuator of the electromagnetic valve is complicated, and the inductance of the electromagnetic coil makes the response time lag behind, resulting in poor control accuracy of the valve. The patent application number 200810120557.3 discloses an engine gas distribution system controlled by electro-hydraulic integrated control, including a valve rod, a hydraulic cylinder and a hydraulic oil circuit, the piston rod of the hydraulic cylinder is connected to the valve rod, and the oil inlet is connected to a reversing The oil circuit of the valve is connected, the reversing valve is connected with the high-pressure oil circuit, and the other is connected with the low-pressure circuit. The change of the reversing valve is controlled by an electromagnetic switch. The best gas distribution effect, but the solenoid valve switch still has the shortcomings of slow response and poor control accuracy.

Contents of the invention

The object of the present invention is to provide a piezo-electrically controlled supercharged gas distribution system with easy control of gas distribution phase, convenient and flexible adjustment of gas distribution duration angle and valve lift, and variable driving pressure.

The purpose of the present invention is achieved like this:

The piezoelectric control pressurized gas distribution system of the present invention is characterized in that: it includes a gas distribution unit, a hydraulic oil rail, and a fuel tank; the gas distribution unit includes a valve body, a piezoelectric control part, a valve, and a casing, and the piezoelectric control Part includes piezoelectric stack, ejector rod, ball valve, ball valve return spring, piezoelectric stack is installed in the valve body, and the valve body is respectively equipped with ejector rod cavity, high pressure oil inlet hole, high and low pressure through hole, low pressure oil return hole, ball valve cavity and the ball valve return spring chamber, the ejector rod is located in the ejector rod chamber and below the piezoelectric stack, the ball valve is located in the ball valve chamber, the ball valve chamber is located below the ejector rod chamber, the ball valve return spring chamber is located under the ball valve chamber, and the ball valve return spring is set on The ball valve reset spring cavity is located below the ball valve. The position where the upper end of the ball valve cavity matches the ball valve is the first sealing seat surface, and the position where the lower end of the ball valve cavity matches the ball valve is the second sealing seat surface. The high-pressure oil inlet holes are respectively connected to the ejector rod. cavity and hydraulic oil rail, the low-pressure oil return hole is respectively connected to the ball valve return spring cavity and the oil tank, the control cavity is set in the valve body below the piezoelectric control part, the high and low pressure through holes are respectively connected to the ball valve cavity and the control cavity, and the pressure booster is set under the control cavity Piston, the booster piston is covered with a booster piston return spring, a booster chamber is set under the booster piston, and the booster chamber is connected to a low-pressure oil return hole through an oil suction pipeline, and an oil suction check valve is installed on the oil suction line, and a pressure booster chamber is set below the booster chamber Control the piston, the control piston is connected to the valve, the valve is covered with a valve return spring, the shell is arranged under the valve body, the end of the valve is equipped with a valve seat, and the valve seat is located outside the shell; the number of the gas distribution unit is the same as the number of engine cylinders The numbers match.

The present invention may also include:

1. The area of the upper end surface of the booster piston is larger than the area of its lower end surface.

2. When the piezoelectric control part is not energized, the piezoelectric stack maintains the original length, the ball valve return spring presses the ball valve to the first sealing seat surface, the pressurized hydraulic oil flows into the ejector rod cavity through the high-pressure oil inlet hole, and the second sealing seat surface opens , the high and low pressure through holes are connected to the control chamber and the low pressure oil return hole, and the valve seat is pressed on the shell under the action of the valve return spring; after the piezoelectric control part is energized, the piezoelectric stack deforms and elongates, pushing the ejector rod downward, and the ball valve Moving down with the ejector rod, the ball valve leaves the first sealing seat surface and seals the second sealing seat surface, the high and low pressure through holes are disconnected from the low pressure oil return hole, the high and low pressure through holes are connected with the high pressure oil inlet hole, The pressurized hydraulic oil flow flows into the control chamber, the pressurized piston moves downward, the control piston moves downward together with the valve, and the valve seat leaves the housing.

The advantage of the present invention is that: the present invention controls the displacement of the ball valve through the power on and off of the piezoelectric control part, realizes the flexible control of the high and low pressure oil circuit on and off and the flow rate, and then controls the supply and discharge of hydraulic oil in the control chamber, The hydraulic oil in the booster chamber is boosted by the booster piston, so that the hydraulic pressure acting on the control piston can be flexibly changed, and the valve is driven by hydraulic pressure to open and close, so as to realize the on-off between the valve and the vent port, and can effectively control the gas distribution. Timing and air distribution duration angle; the use of hydraulic oil rail significantly reduces the valve opening and closing instability caused by the hydraulic oil pressure fluctuation caused by the high and low pressure oil circuit conversion of the piezoelectric control part, ensuring the reliability of the air distribution system and consistency; the piezoelectric stack directly drives the ball valve, which can flexibly and accurately control the gas distribution law, which is conducive to the realization of the flexible gas distribution method under different working conditions of the internal combustion engine, significantly improves the degree of freedom of valve control, and can further improve fuel economy It is beneficial to improve the power performance of the internal combustion engine.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the piezoelectric control part of the present invention.

detailed description

The present invention is described in more detail below in conjunction with accompanying drawing example:

1-2, the present invention is a piezoelectric control booster gas distribution system, which consists of hydraulic oil rail 1, hydraulic oil pipe 2, piezoelectric control part 3, control chamber 4, booster piston 5, booster piston reset Spring 6, oil suction check valve 7, boost chamber 8, control piston 9, valve body 10, spring seat 11, valve return spring 12, valve 13, shell 14, vent 15, valve seat 16, oil return pipe 17, fuel tank 18. The filter 19 and the hydraulic oil pump 20 are composed. The left end of the hydraulic oil rail 1 is respectively connected with the hydraulic oil pump 20, the filter 19 and the oil tank 18 through oil pipes. There are multiple hydraulic oil outlets on the hydraulic oil rail 1. The number of hydraulic oil outlets is determined according to the number of cylinders of the internal combustion engine. The outlet communicates with the hydraulic oil inlet opened on the valve body 10 through the hydraulic oil pipe 2 , and the low-pressure oil return port opened on the valve body 10 communicates with the oil tank 18 through the oil return pipe 17 . Electrical connector 21, piezoelectric stack 22, high pressure oil inlet hole 23, first sealing seat surface 24, ball valve return spring 25, high and low pressure through hole 26, low pressure oil return hole 27, second sealing seat surface 28, ball valve 29 and top The rods 30 together constitute the piezo control part 3 of the piezo control pressurized gas distribution system. The valve body 10 is respectively designed with a high pressure oil inlet hole 23, a first sealing seat surface 24, a high and low pressure through hole 26, a low pressure oil return hole 27 and a second sealing seat surface 28, and the high pressure oil inlet hole 23 passes through the valve body 10. The hydraulic oil passage is connected with the hydraulic oil inlet, and the low-pressure oil return hole 27 is connected with the low-pressure oil return passage through the low-pressure oil return passage on the valve body 10. When the ball valve 29 is pressed onto the first sealing seat surface 24, the high The low-pressure through-hole 26 communicates with the control chamber 4 and the low-pressure oil return hole 27. When the ball valve 29 is pressed onto the second sealing seat surface 28, the high-low pressure through-hole 26 communicates with the control chamber 4 and the high-pressure oil inlet 23, and the piezoelectric stack 22 The upper end is connected with the electric control unit of the internal combustion engine through the electric connector 21, and then controls the lifting and seating of the ball valve 29, and the ball valve 29 is pressed onto the push rod 30 by the ball valve return spring 25. The area of the upper end of the supercharging piston 5 is larger than the area of the lower end, and a control chamber 4 is formed between the upper end and the valve body 10. The control chamber 4 communicates with the high and low pressure through holes 26, and a supercharging chamber 8 is formed between the lower end and the control piston 9 and the valve body 10. The boost chamber 8 communicates with the oil tank 18 through the oil suction check valve 7 . The control piston 9 is set on the upper part of the valve 13, the control piston 9 opens and closes with the valve 13 and moves synchronously with the valve 13, the spring seat 11 is fixed on the valve 13 through the stop ring, and moves together with it, and the valve return spring 12 is pressed Between the spring seat 11 and the casing 14 , the valve seat 16 limits the movement lift of the valve 13 .

Figure 1 is a schematic diagram of the overall structure of the piezoelectric control pressurized gas distribution system of the present invention, including a hydraulic oil rail 1, a hydraulic oil pipe 2, a piezoelectric control part 3, a control chamber 4, a booster piston 5, and a booster piston return spring 6 , oil suction check valve 7, boost chamber 8, control piston 9, valve body 10, spring seat 11, valve return spring 12, valve 13, shell 14, vent 15, valve seat 16, oil return pipe 17, fuel tank 18, The filter 19 and the hydraulic oil pump 20 are composed. The left end of the hydraulic oil rail 1 is respectively connected with the hydraulic oil pump 20, the filter 19 and the oil tank 18 through oil pipes. There are multiple hydraulic oil outlets on the hydraulic oil rail 1. The number of hydraulic oil outlets is determined according to the number of cylinders of the internal combustion engine, as shown in the figure As shown in 1, it is a schematic diagram when the present invention is used in a four-cylinder internal combustion engine. The hydraulic oil outlet communicates with the hydraulic oil inlet port provided on the valve body 10 through the hydraulic oil pipe 2, and the low-pressure oil return port provided on the valve body 10 passes through The oil return pipe 17 communicates with the oil tank 18 . Electrical connector 21, piezoelectric stack 22, high pressure oil inlet hole 23, first sealing seat surface 24, ball valve return spring 25, high and low pressure through hole 26, low pressure oil return hole 27, second sealing seat surface 28, ball valve 29 and top The rods 30 together constitute the piezoelectric control part 3 of the piezoelectric control pressurized gas distribution system, as shown in FIG. 2 . The valve body 10 is respectively designed with a high pressure oil inlet hole 23, a first sealing seat surface 24, a high and low pressure through hole 26, a low pressure oil return hole 27 and a second sealing seat surface 28, and the high pressure oil inlet hole 23 passes through the valve body 10. The hydraulic oil passage is connected with the hydraulic oil inlet, and the low-pressure oil return hole 27 is connected with the low-pressure oil return passage through the low-pressure oil return passage on the valve body 10. When the ball valve 29 is pressed onto the first sealing seat surface 24, the high The low-pressure through-hole 26 communicates with the control chamber 4 and the low-pressure oil return hole 27. When the ball valve 29 is pressed onto the second sealing seat surface 28, the high-low pressure through-hole 26 communicates with the control chamber 4 and the high-pressure oil inlet 23, and the piezoelectric stack 22 The upper end is connected with the electric control unit of the internal combustion engine through the electric connector 21, and then controls the lifting and seating of the ball valve 29, and the ball valve 29 is pressed onto the push rod 30 by the ball valve return spring 25. The area of the upper end of the supercharging piston 5 is larger than the area of the lower end, and a control chamber 4 is formed between the upper end and the valve body 10. The control chamber 4 communicates with the high and low pressure through holes 26, and a supercharging chamber 8 is formed between the lower end and the control piston 9 and the valve body 10. The boost chamber 8 communicates with the oil tank 18 through the oil suction check valve 7 . The control piston 9 is set on the upper part of the valve 13, the control piston 9 opens and closes with the valve 13 and moves synchronously with the valve 13, the spring seat 11 is fixed on the valve 13 through the stop ring, and moves together with it, and the valve return spring 12 is pressed Between the spring seat 11 and the casing 14 , the valve seat 16 limits the movement lift of the valve 13 . As shown in Figure 1, when the present invention is used in a four-cylinder internal combustion engine, the hydraulic oil in the oil tank 18 flows into the filter 19 through the oil pipe, and the filtered hydraulic oil flows into the hydraulic oil pump 20 through the oil pipe, and is pressurized in the hydraulic oil pump 20 When a certain pressure is reached, the pressurized hydraulic oil flowing out from the hydraulic oil pump 20 flows into the hydraulic oil rail 1 through the oil pipe, and is stored in the hydraulic oil rail 1. The pressurized hydraulic oil in the hydraulic oil rail 1 flows through the hydraulic oil pipe 2 and passes through the valve body. The hydraulic oil inlet opened on 10 flows into the hydraulic oil inlet channel in the valve body 10. When the piezoelectric control part 3 of the piezoelectric control pressurized gas distribution system is not energized, the piezoelectric stack 22 maintains the original length and does not elongate. The ball valve return spring 25 presses the ball valve 29 to the first sealing seat surface 24, and the pressurized hydraulic oil flowing into the valve body 10 flows into the first sealing seat surface 24, the ball valve 29, the ejector rod 30 and the valve body 10 through the high-pressure oil inlet hole 23. In the formed annular cavity, since the hydraulic pressure on the ball valve 29 in this cavity is less than the upward spring force of the ball valve return spring 25, the ball valve 29 is still pressed onto the first sealing seat surface 24 by the ball valve return spring 25, at this time , the second sealing seat surface 28 is opened, the high and low pressure through hole 26 communicates with the control chamber 4 and the low pressure oil return hole 27, so that the control chamber 4 and the oil tank 18 are connected through the oil return pipe 13, the pressure of the hydraulic oil in the control chamber 4 is low, and the pressurization The piston 5 does not pressurize the hydraulic oil in the booster chamber 8 under the action of the booster piston return spring 6, and the pressure of the hydraulic oil in the booster chamber 8 is relatively low, and the valve 13 is compressed to On the valve seat 16, the air port 15 is not connected to the cylinder; after the piezoelectric control part 3 of the piezoelectric control supercharged gas distribution system receives the supercharging control current from the electronic control unit of the internal combustion engine, due to the inverse piezoelectricity of the piezoelectric stack 22 effect, the piezoelectric stack 22 deforms and elongates, pushes the ejector rod 30 downward, the ball valve 29 moves downward together with the ejector rod 30, the ball valve 29 leaves the first sealing seat surface 24 and seals the second sealing seat surface 28, and the high and low pressure through holes 26 is disconnected from the low pressure oil return hole 27, the high and low pressure through hole 26 is connected with the high pressure oil inlet hole 23, the pressurized hydraulic oil in the hydraulic oil rail 1 flows into the control chamber 4 through the hydraulic oil pipe 2, and the pressure in the control chamber 4 rises rapidly High, because the area of the upper end of the booster piston 5 is larger than the area of the lower end, the booster piston 5 moves downward and pressurizes the hydraulic oil in the booster chamber 8, and the pressure of the hydraulic oil in the booster chamber 8 increases rapidly. At this time, the control piston 9 The hydraulic pressure is greater than the resultant force of the spring force of the valve return spring 12 and the internal pressure of the cylinder on the valve 13, the control piston 9 moves downward together with the valve 13, the valve 13 leaves the valve seat 16 and opens, the air port 15 communicates with the cylinder, and opens Gas distribution; when the piezoelectric control part 3 of the piezoelectric control pressurized gas distribution system is powered off again, the piezoelectric stack 22 returns to the original length again, and the ball valve 29 moves upward under the spring force of the ball valve return spring 25 to seal the first valve again. The sealing seat surface 24, the high and low pressure through hole 26 is disconnected from the high pressure oil inlet hole 23, the second sealing seat surface 28 is opened, the control chamber 4 is connected with the low pressure oil return hole 27 through the high and low pressure through hole 26, and the oil in the control chamber 4 The high pressure hydraulic oil flows back to the oil tank 18 through the high and low pressure through holes 26, The pressure in the control chamber 4 drops rapidly, and the booster piston 5 moves upward to the initial position under the combined force of the spring force of the booster piston return spring 6 and the hydraulic oil in the booster chamber 8 to the hydraulic pressure on the lower end surface of the booster piston 5, and the oil suction unit Open to the valve 7, the booster chamber 8 absorbs oil from the oil tank 18 through the oil suction check valve 7, the pressure of the hydraulic oil in the booster chamber 8 returns to the initial value, and the valve 13 moves upward under the action of the spring force of the valve return spring 12 To the valve seat 16 and closed, complete a valve cycle process. As shown in Fig. 1, it is a schematic diagram when the present invention is used in a four-cylinder internal combustion engine, and the piezoelectric control part 3, the control chamber 4, and the booster piston of the piezoelectric control supercharged gas distribution system of the present invention can be flexibly adjusted according to the number of cylinders of the internal combustion engine. 5. Booster piston return spring 6, oil suction check valve 7, booster chamber 8, control piston 9, valve body 10, spring seat 11, valve return spring 12, valve 13, shell 14, vent 15 and valve seat 16 Waiting number. The present invention uses the hydraulic oil rail 1 to significantly reduce the opening and closing instability of the valve 13 caused by the hydraulic oil pressure fluctuation caused by the high and low pressure oil circuit conversion of the piezoelectric control part 3, ensuring the reliability and consistency of the gas distribution system. The displacement of the ball valve 29 is directly driven by the piezoelectric control part 3 on and off, so as to realize the flexible control of the on-off of the high and low pressure oil circuit and the flow rate. The hydraulic pressure acting on the control piston can be changed flexibly, and the valve is driven by hydraulic pressure to open and close, so that different air distribution methods can be realized. The timing of the air distribution can be adjusted according to different working conditions, and the continuous angle of the air distribution can be flexibly controlled, which significantly improves the performance of the valve. 13 control degrees of freedom can further improve the fuel economy and internal combustion engine emissions, which is conducive to improving the power performance of the internal combustion engine.

The piezoelectric control pressurized gas distribution system of the present invention includes a hydraulic oil rail, a hydraulic oil pipe, a piezoelectric control part, a control chamber, a pressurized piston, a pressurized piston return spring, an oil suction check valve, a pressurized chamber, a control piston, and a valve Body, spring seat, valve return spring, valve, housing, vent, valve seat, oil return pipe, oil tank, filter and hydraulic oil pump. The hydraulic oil inlet opened on the valve body communicates with the hydraulic oil rail through the hydraulic oil pipe, and the low-pressure oil return port opened on the valve body communicates with the oil tank through the oil return pipe. The valve body is respectively designed with a high pressure oil inlet hole, a first sealing seat surface, a high and low pressure through hole, a low pressure oil return hole and a second sealing seat surface. The area of the upper end of the supercharging piston is larger than that of the lower end, and a control chamber is formed between the upper end and the valve body. Connected to fuel tank. The control piston is arranged on the upper part of the valve, the spring seat is fixed on the valve through the stop ring, and the valve return spring is compressed between the spring seat and the shell.

The piezoelectric control part includes an electrical connector, a piezoelectric stack, a high pressure oil inlet, a first sealing seat surface, a ball valve return spring, a high and low pressure through hole, a low pressure oil return hole, a second sealing seat surface, a ball valve and a push rod. The high-pressure oil inlet hole communicates with the hydraulic oil inlet through the hydraulic oil channel on the valve body, and the low-pressure oil return hole communicates with the low-pressure oil return port through the low-pressure oil return channel on the valve body. When on the surface, the high and low pressure through holes connect the control chamber and the low pressure oil return hole. When the ball valve is pressed to the second sealing seat surface, the high and low pressure through holes connect the control chamber and the high pressure oil inlet hole, and the upper end of the piezoelectric stack passes through the electrical connector It is connected with the electronic control unit of the internal combustion engine, and the ball valve is pressed onto the ejector rod through the return spring of the ball valve. Piezoelectric control part, control chamber, booster piston, booster piston return spring, oil suction check valve, booster chamber, control piston, valve body, spring seat, valve return spring, valve, casing, vent port and valve seat The number is the same as the number of cylinders of the internal combustion engine.

Claims (3)

1. Piezoelectric control pressurized gas distribution system is characterized in that: it includes a gas distribution unit, a hydraulic oil rail, and a fuel tank; Part includes piezoelectric stack, ejector rod, ball valve, ball valve return spring, piezoelectric stack is installed in the valve body, and the valve body is respectively equipped with ejector rod cavity, high pressure oil inlet hole, high and low pressure through hole, low pressure oil return hole, ball valve cavity and the ball valve return spring chamber, the ejector rod is located in the ejector rod chamber and below the piezoelectric stack, the ball valve is located in the ball valve chamber, the ball valve chamber is located below the ejector rod chamber, the ball valve return spring chamber is located under the ball valve chamber, and the ball valve return spring is set on The ball valve reset spring cavity is located below the ball valve. The position where the upper end of the ball valve cavity matches the ball valve is the first sealing seat surface, and the position where the lower end of the ball valve cavity matches the ball valve is the second sealing seat surface. The high-pressure oil inlet holes are respectively connected to the ejector rod. cavity and hydraulic oil rail, the low-pressure oil return hole is respectively connected to the ball valve return spring cavity and the oil tank, the control cavity is set in the valve body below the piezoelectric control part, the high and low pressure through holes are respectively connected to the ball valve cavity and the control cavity, and the pressure booster is set under the control cavity Piston, the booster piston is covered with a booster piston return spring, a booster chamber is set under the booster piston, and the booster chamber is connected to a low-pressure oil return hole through an oil suction pipeline, and an oil suction check valve is installed on the oil suction line, and a pressure booster chamber is set below the booster chamber Control the piston, the control piston is connected to the valve, the valve is covered with a valve return spring, the shell is arranged under the valve body, the end of the valve is equipped with a valve seat, and the valve seat is located outside the shell; the number of the gas distribution unit is the same as the number of engine cylinders The numbers match. 2. The piezoelectric control pressurized gas distribution system according to claim 1, wherein the area of the upper end surface of the booster piston is larger than the area of the lower end surface of the booster piston. 3. The piezoelectric control pressurized gas distribution system according to claim 1 or 2, characterized in that: when the piezoelectric control part is not energized, the piezoelectric stack maintains the original length, and the return spring of the ball valve presses the ball valve to the first seal On the seat surface, the pressurized hydraulic oil flows into the ejector rod cavity through the high-pressure oil inlet hole, the second sealing seat surface is opened, the high and low pressure through holes connect the control chamber and the low pressure oil return hole, and the valve seat is pressed against the shell by the action of the valve return spring. Above; after the piezoelectric control part is energized, the piezoelectric stack deforms and elongates, pushing the ejector rod downward, and the ball valve moves downward together with the ejector rod, the ball valve leaves the first sealing seat surface and seals the second sealing seat surface, and the high and low pressure through holes It is disconnected from the low-pressure oil return hole, the high-low pressure through hole is connected with the high-pressure oil inlet hole, the pressurized hydraulic oil in the hydraulic oil rail flows into the control chamber, the booster piston moves downward, the control piston moves downward together with the valve, and the valve seat out of the housing.