Aircraft piston engine intake temperature regulating device and method

Abstract

The present invention relates to the technical field of aviation piston engines, and in particular to an intake air temperature regulating device and method for aviation piston engines. The air inlet and outlet of an air-cooled radiator are respectively connected to the air outlet of an engine turbocharger and the intake manifold; a shutter mechanism is installed at the front end of the radiator heat dissipation core and is directly connected to the cooling air duct; the regulator is connected to the shutter mechanism through a connecting rod mechanism; the upper computer collects the intake air temperature in real time, and when the intake air temperature exceeds the preset limit, the upper computer controls the opening of the regulator, and the regulator rocker arm is connected to the shutter connecting rod, and the shutter opening is changed under the actuation of the rocker arm, thereby changing the air intake volume through the air-cooled radiator to achieve engine intake air temperature regulation.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation piston engines, and in particular to an aviation piston engine intake air temperature regulating device and method. Background Art

[0002] Aviation piston engines have a dominant position in UAV power devices due to their small size, light weight, high power per liter, low fuel consumption, simple structure, convenient operation and maintenance, short production cycle and low cost. According to incomplete statistics, nearly 80% of the current UAVs in the world use aviation piston engines as their power devices. In addition to a few models such as the J-6 modified and the Wuzhen-5, our military's active UAVs also mainly use aviation piston engines. With the continuous development of science and technology and the complexity and diversity of usage scenarios, the requirements of "higher, faster, longer and farther" have been put forward for UAVs. At the same time, the requirements of "high ceiling, long endurance, multi-fuel and high reliability" have also been put forward for UAV power devices. Among them, the high ceiling requires the aviation piston engine to have a higher intake pressure at high altitudes, while the actual high-altitude environment has a low atmospheric density. The atmospheric density at an altitude of 10,000m is about 32% of the sea level. If high-altitude power recovery is required, higher requirements are placed on the engine supercharger. However, the high intake temperature rise caused by the high pressure ratio will cause engine knock, so the intake temperature needs to be reduced through the radiator.

[0003] At present, domestic high-boost ratio aviation piston engines are all equipped with intake radiators, but the control accuracy of the radiator cooling air volume after installation is low, or even no control, and the installation layout is relatively loose. This method can basically meet the intake cooling needs in extremely hot environments, but for extremely cold and low-altitude environments, there is a problem of too low intake temperature, which may lead to poor fuel atomization, unstable engine operation, and even engine shutdown in the air. Summary of the invention

[0004] The technical problems to be solved by the present invention are:

[0005] In order to solve the technical problems that the cooling air volume control accuracy of the radiator of a high-boost ratio aviation piston engine is low, or even no control is performed, and the installation layout is relatively loose, the present invention aims to provide an aviation piston engine intake temperature regulating device with a compact installation layout and precise intake temperature control.

[0006] A technical solution provided by the present invention is:

[0007] An air intake temperature regulating device for an aviation piston engine, comprising: an air-cooled radiator, a shutter mechanism and a regulator;

[0008] The air inlet and outlet of the air-cooled radiator are arranged on the same side and connected to the air outlet of the engine turbocharger and the air intake manifold respectively;

[0009] The shutter mechanism is installed at the front end of the heat dissipation core of the air-cooled radiator and is directly connected to the cooling air duct of the heat dissipation core;

[0010] The regulator and the air-cooled radiator are both fixedly mounted on the bracket. The regulator changes the opening and closing of the shutter mechanism blades to adjust the air intake volume through the cooling air duct of the air-cooled radiator, thereby achieving precise regulation and control of the engine intake temperature.

[0011] Preferably, the shutter mechanism includes a plurality of shutter blades, a blade bracket and a blade connecting rod. Two blade brackets are fixedly mounted on the front end of the radiator heat dissipation core and are symmetrically arranged between the air inlet and the air outlet of the air-cooled radiator. A plurality of shutter blades are connected to the blade brackets with parallel pins at equal intervals along the axial direction of the blade brackets, so that the shutter blades can rotate freely around the pins. The blade connecting rod is pivotally connected to the plurality of shutter blades along the axial direction of the blade brackets, respectively, to realize the linkage of the shutter blades.

[0012] Preferably, the regulator includes a driving mechanism and a connecting rod mechanism, the connecting rod mechanism includes a T-shaped connecting plate, a connecting rod and a rocker arm, the rocker arm is installed on the output shaft of the regulator driving mechanism, the output end of the rocker arm is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the T-shaped connecting plate; the T-shaped connecting plate is connected to the shutter blade pin at the lowest end of the blade bracket.

[0013] Preferably, the length dimensions of the rocker arm and the blade connecting rod are such that when the driving mechanism rotates at a full range angle, the rotation angle of the shutter blades is 90°, thereby ensuring that the shutter blades are fully opened or closed.

[0014] Preferably, the intake air temperature regulating device further comprises a host computer, which is communicatively connected with the regulator, and controls the rotation angle of the output shaft of the regulator to change the opening of the shutter blades through a connecting rod mechanism.

[0015] Preferably, the regulator driving mechanism is a digital electric servo.

[0016] Preferably, the number of the shutter blades is at least 3.

[0017] A technical solution provided by the present invention is:

[0018] A method for regulating the intake air temperature of an aviation piston engine comprises the following steps:

[0019] The air inlet and outlet of the air-cooled radiator are connected to the air outlet of the engine turbocharger and the air intake manifold respectively; the shutter mechanism is installed at the front end of the radiator heat dissipation core and is directly connected to the cooling air duct; the regulator is connected to the shutter mechanism through a connecting rod mechanism; the upper computer collects the intake air temperature in real time. When the intake air temperature exceeds the preset limit, the upper computer controls the opening of the regulator. The regulator rocker arm is connected to the shutter connecting rod. The shutter opening is changed under the actuation of the rocker arm, thereby changing the air intake volume through the air-cooled radiator to achieve engine intake temperature regulation.

[0020] As a preferred embodiment, the intake air temperature regulator controls the amount Follow these rules:

[0021]

[0022] in, is the intake air temperature regulator control quantity, is the proportional adjustment coefficient, T is the current intake air temperature, S is a complex variable, T0 is the target intake air temperature, is the integral adjustment coefficient.

[0023] Beneficial Effects

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The present invention provides an air intake temperature regulating device and method for an aviation piston engine. The opening and closing size of the blades of a shutter mechanism is changed by a regulator to adjust the air intake amount through an air-cooled radiator, thereby achieving the purpose of accurately controlling the engine intake temperature and ensuring that the engine intake temperature meets the use requirements.

[0026] 2. The present invention provides an intake temperature regulating device and method for an aviation piston engine. The intake temperature control is based on closed-loop control of the shutter blade opening. The regulator control quantity increment is generated by the difference between the intake temperature feedback and the target intake temperature value, which acts on the shutter blades to adjust the shutter blade opening in real time, thereby achieving precise control of the intake temperature.

[0027] 3. The present invention provides an air intake temperature regulating device and method for an aviation piston engine. The air inlet and air outlet of a radiator are arranged on the same side and are respectively connected to the air outlet of an engine turbocharger and an air intake manifold. A shutter mechanism is installed on the front side of a radiator heat dissipation core and is directly connected to a cooling air duct. A regulator is fixed on a bracket and is connected to the shutter blades through an adjusting rocker arm and a connecting rod. This arrangement has a compact structure and is suitable for small and medium-sized unmanned aerial vehicles.

[0028] 4. The present invention provides an intake temperature regulating device and method for an aviation piston engine. The left and right sides of the louver blades are connected to the louver blade bracket through a pin shaft, so that the louver blades can rotate freely around the pin shaft. At the same time, one side of the louver blade is connected to the louver connecting rod through a pin shaft, so that at least three louver blades are linked to each other, ensuring that when the louver blades are fully closed, they can completely cover the windward surface of the radiator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of an air intake temperature regulating device for an aviation piston engine of the present invention (with shutter blades fully opened);

[0030] Figure 2 It is a schematic diagram of an air intake temperature regulating device for an aviation piston engine of the present invention (with shutter blades fully closed);

[0031] Figure 3 This is a relationship diagram of the regulator action angle, shutter opening and engine intake temperature of the present invention.

[0032] Description of reference numerals:

[0033] 1-air-cooled radiator; 101-air inlet; 102-air outlet; 103-radiator core structure; 2-louver mechanism; 201-first blade; 202-second blade; 203-third blade; 204-blade bracket; 205-blade connecting rod; 3-T-type connecting plate; 4-louver connecting rod; 5-rocker arm; 6-regulator; 7-bracket; 8-host computer. DETAILED DESCRIPTION

[0034] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] Example 1

[0037] like Figure 1-2 As shown, an air intake temperature regulating device for an aviation piston engine, such as Figure 1As shown, it includes: an air-cooled radiator 1, a shutter mechanism 2, a regulator 6, a shutter connecting rod 4 and a regulator rocker arm 5 for connecting the regulator 6 and the shutter mechanism T-shaped connecting plate 3, a bracket 7 for fixing the air-cooled radiator 1 and the regulator 6, and a host computer 8 for controlling the regulator 6.

[0038] The air-cooled radiator 1 has an air inlet 101 at one end connected to the air outlet of the engine turbocharger, and an air outlet 102 at the other end connected to the engine air intake manifold. The air inlet 101 and the air outlet 102 are arranged on the same side, with a radiator core structure 103 in the middle.

[0039] The shutter mechanism 2 is composed of a first blade 201, a second blade 202, a third blade 203, a shutter blade bracket 204 and a shutter blade connecting rod 205. The shutter blade bracket 204 is fixed to the air-cooled radiator 1 by bolts, one on each side. The first blade 201, the second blade 202, and the third blade 203 are fixed to the shutter blade bracket 204 by a pin shaft, and are connected to the shutter blade connecting rod 205 by a pin shaft.

[0040] The third blade 203 is connected to the T-shaped connecting plate 3 by bolts, and the T-shaped connecting plate 3 is connected to the shutter connecting rod 4 by a pin shaft. The bolt connection hole of the T-shaped connecting plate is a U-shaped hole, which is used to compensate for installation and manufacturing dimensional errors. The regulator rocker arm 5 is installed on the output shaft of the regulator 6 and is connected to the shutter connecting rod 4 by a pin shaft to form a linkage mechanism. When the length size of the regulator rocker arm and the shutter connecting rod meets the full range angle of rotation of the regulator motor, the rotation angle of the shutter is 90°, which ensures that the shutter blades can be fully opened or closed.

[0041] The regulator 6 is controlled by the host computer 8. When the engine is running, the host computer 8 collects the intake air temperature in real time. If the intake air temperature exceeds the preset limit, the host computer 8 controls the rotation angle of the output shaft of the regulator 6, changes the opening of the shutter blades under the actuation of the rocker arm, and then changes the air intake volume through the air-cooled radiator 1, so as to achieve the purpose of accurately controlling the engine intake air temperature.

[0042] Intake air temperature regulator control amount Follow these rules:

[0043]

[0044] in, is the intake air temperature regulator control quantity, is the proportional adjustment coefficient, T is the current intake air temperature, S is a complex variable, T0 is the target intake air temperature, is the integral adjustment coefficient.

[0045] The relationship between the regulator action angle, shutter opening and engine intake temperature is shown in Figure 3 shown. Figure 3 The intake air temperature data is the engine intake air temperature value under a certain environment. As can be seen from the figure, when the regulator actuation angle is 0°, the shutter opening is 0%, and the maximum intake air temperature is 60°C. As the regulator actuation angle increases, the shutter opening gradually increases and the intake air temperature gradually decreases. When the regulator actuation angle is 50°, the shutter opening is 100%, and the intake air temperature drops to 43°C. Therefore, the purpose of accurately controlling the intake air temperature can be achieved by setting different regulator actuation angles.

[0046] The present invention provides an air intake temperature regulating device and method for an aviation piston engine. The opening and closing size of the shutter mechanism blades is changed by a regulator, and the air intake through the air-cooled radiator is adjusted to achieve the purpose of accurately controlling the engine intake temperature, and ensure that the engine intake temperature meets the use requirements. The intake temperature control is based on the closed-loop control of the shutter blade opening. The regulator control amount increment is generated by the difference between the intake temperature feedback and the target intake temperature value, and acts on the shutter blades to adjust the shutter blade opening in real time, thereby achieving accurate control of the intake temperature.

[0047] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. An air intake temperature regulating device for an aviation piston engine, characterized in that: include: Air-cooled radiator, shutter mechanism and regulator; The air inlet and outlet of the air-cooled radiator are arranged on the same side and connected to the air outlet of the engine turbocharger and the air intake manifold respectively; The shutter mechanism is installed at the front end of the heat dissipation core of the air-cooled radiator and is directly connected to the cooling air duct of the heat dissipation core; The regulator and the air-cooled radiator are both fixedly mounted on the bracket, and the regulator is used to change the opening and closing of the shutter mechanism blades to adjust the air intake volume through the cooling air duct of the air-cooled radiator, thereby achieving precise regulation and control of the engine intake temperature; The shutter mechanism comprises a plurality of shutter blades, a blade bracket and a blade connecting rod, wherein two blade brackets are fixedly mounted on the front end of the heat dissipation core of the radiator and symmetrically arranged between the air inlet and the air outlet of the air-cooled radiator, and a plurality of shutter blades are connected to the blade brackets with parallel pins at equal intervals along the axis direction of the blade brackets, so that the shutter blades can rotate freely around the pins; the blade connecting rods are respectively pivotally connected to the plurality of shutter blades along the axis direction of the blade brackets to realize the linkage of the shutter blades; The regulator includes a driving mechanism and a connecting rod mechanism, the connecting rod mechanism includes a T-shaped connecting plate, a connecting rod and a rocker arm, the rocker arm is installed on the output shaft of the regulator driving mechanism, the output end of the rocker arm is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the T-shaped connecting plate; the T-shaped connecting plate is connected to the shutter blade pin at the lowest end of the blade bracket; The length of the rocker arm and the blade connecting rod is such that when the driving mechanism rotates at a full range angle, the shutter blades rotate at an angle of 90°, ensuring that the shutter blades are fully opened or closed; The inlet air temperature regulating device also includes a host computer, which is in communication connection with the regulator, and the host computer controls the rotation angle of the output shaft of the regulator to change the opening of the shutter blades through the connecting rod mechanism; The regulator driving mechanism is a digital electric steering gear; The number of the shutter blades is at least 3.

2. A method for using the aircraft piston engine intake temperature regulating device according to claim 1, characterized in that: The air inlet and outlet of the air-cooled radiator are connected to the air outlet of the engine turbocharger and the air intake manifold respectively; the shutter mechanism is installed at the front end of the radiator heat dissipation core and is directly connected to the cooling air duct; the regulator is connected to the shutter mechanism through a connecting rod mechanism; the upper computer collects the intake air temperature in real time, and when the intake air temperature exceeds the preset limit, the upper computer controls the opening of the regulator, and the regulator rocker arm is connected to the shutter connecting rod. The shutter opening is changed under the actuation of the rocker arm, thereby changing the air intake volume through the air-cooled radiator to achieve engine intake temperature regulation; Intake air temperature regulator control amount Follow these rules: in, is the intake air temperature regulator control quantity, is the proportional adjustment coefficient, T is the current intake air temperature, S is a complex variable, T0 is the target intake air temperature, is the integral adjustment coefficient.

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