A hybrid electric transmission gas path control system and method

Abstract

The application discloses an oil-electric hybrid transmission gas circuit control system and method, which comprises an air compressor, a gas circuit protection valve, a whole vehicle gas tank, a minimum pressure valve, a pressure regulating valve, a transmission special gas tank, a pressure sensor, a transmission TCU, a control mechanism and a clutch actuator; the air outlet of the air compressor is connected with one end of the gas circuit protection valve, the other end of the gas circuit protection valve is connected with the whole vehicle gas tank, the air outlet of the whole vehicle gas tank is connected with one end of the minimum pressure valve, the other end of the minimum pressure valve is connected with one end of the pressure regulating valve, the other end of the pressure regulating valve is connected with the air inlet of the transmission special gas tank, the air outlets of the transmission special gas tank are respectively connected with the control mechanism and the clutch actuator, the transmission special gas tank is provided with the pressure sensor, the pressure sensor is connected with the transmission TCU, and the transmission TCU controls the control mechanism and the clutch actuator to automatically shift gears. The application solves the problems of poor reliability and uneven gear shifting of the electric hybrid transmission.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmissions, and in particular to an air circuit control system and method for an oil-electric hybrid transmission. Background Art

[0002] In recent years, due to the rising prices of power battery raw materials, the manufacturing cost of pure electric trucks has been rising. At the same time, since battery technology is not yet very mature, many truck drivers are worried about the endurance of pure electric vehicles. Therefore, the hybrid truck technology route has become the focus of the commercial vehicle field.

[0003] However, the existing hybrid transmission has problems of poor reliability and uneven gear shifting. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides an oil-electric hybrid transmission air circuit control system and method, which are used to solve the problems of poor reliability and uneven gear shifting in the electric hybrid transmission.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A hybrid transmission air circuit control system, including an air compressor, an air circuit protection valve, a vehicle air tank, a minimum pressure valve, a pressure regulating valve, a transmission-specific air tank, a pressure sensor, a transmission TCU, a control mechanism, and a clutch actuator;

[0007] The air outlet of the air compressor is connected to one end of the air circuit protection valve, the other end of the air circuit protection valve is connected to the vehicle air tank, the air outlet of the vehicle air tank is connected to one end of the minimum pressure valve, the other end of the minimum pressure valve is connected to one end of the pressure regulating valve, the other end of the pressure regulating valve is connected to the air inlet of the transmission-specific air tank, the air outlet of the transmission-specific air tank is respectively connected to the operating mechanism and the clutch actuator, a pressure sensor is provided on the transmission-specific air tank, the pressure sensor data is connected to the transmission TCU, the transmission TCU controls the operating mechanism and the clutch actuator for automatic shifting.

[0008] Preferably, the air outlet of the transmission-specific air tank is connected to an air filter, and the air filter is respectively connected to the operating mechanism and the clutch actuator.

[0009] Preferably, the air outlet of the air compressor is connected to an air dryer, and the air outlet of the air dryer is connected to one end of the air circuit protection valve.

[0010] Preferably, the air pressure of the transmission-specific air tank is 7.5 bar.

[0011] Preferably, when the compressed air pressure in the vehicle's gas tank is greater than 4 bar, the compressed air passes through the minimum pressure valve.

[0012] Preferably, when the pressure of the compressed air in the vehicle's gas tank is greater than 7.5 bar, the pressure regulating valve is closed and no air is supplied to the transmission-specific gas tank.

[0013] Preferably, when the pressure of the compressed air is greater than 4 bar and less than or equal to 7.5 bar, the compressed air passes through the minimum pressure valve and the pressure regulating valve and enters the transmission-dedicated air tank.

[0014] Preferably, when the pressure sensor monitors that the air pressure value of the transmission-specific air tank is greater than or equal to 6.5 bar, the solenoid valve of the transmission TCU operating mechanism or the solenoid valve of the clutch actuator performs automatic shifting.

[0015] A method for controlling the gas path of a hybrid transmission includes the following steps:

[0016] The compressed air generated by the air compressor is evenly distributed to the vehicle's gas tanks by the air circuit protection valve; the compressed air is drawn from any vehicle's gas tank, passes through the minimum pressure valve and the pressure regulating valve, and enters the transmission's dedicated gas tank;

[0017] When compressed air is needed, it enters the operating mechanism and clutch actuator from the transmission's dedicated air tank. When the transmission TCU reads a pressure value of 6.5 bar or above from the pressure sensor, it determines that gear shifting is required based on the vehicle's overall movement. The solenoid valves of the operating mechanism and the clutch actuator are controlled through electrical signals, and compressed air is used to blow the internal mechanical structure of the operating mechanism or clutch actuator to shift gears.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The present invention provides an oil-electric hybrid transmission air circuit control system, which is formed by adopting a transmission-specific air tank, a one-way pressure-limiting valve, a pressure sensor, and a transmission TCU. Through reasonable structural arrangement and precise and complete program logic setting, it realizes precise control of the transmission operating mechanism solenoid valve and the clutch actuator solenoid valve, thereby improving the reliability of the transmission and making the transmission shifting smooth. In addition, the real-time air pressure value can be read through the transmission TCU by using relevant acquisition equipment, which reduces the maintenance time of after-sales personnel in the event of a fault.

[0020] Furthermore, by installing an air dryer and air filter after the air compressor, the gas is ensured to be dry and clean, meeting ISO8573-1 and JED-848 standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an oil-electric hybrid transmission air circuit control system of the present invention.

[0022] In the accompanying figure: 1 is the air compressor; 2 is the air dryer; 3 is the air circuit protection valve; 4 is the vehicle air tank; 5 is the minimum pressure valve; 6 is the pressure regulating valve; 7 is the transmission-specific air tank; 8 is the pressure sensor; 9 is the transmission TCU; 10 is the air filter; 11 is the operating mechanism; 12 is the clutch actuator. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to specific embodiments, which are intended to explain the present invention rather than to limit it.

[0024] Example

[0025] like Figure 1 As shown, an oil-electric hybrid transmission air circuit control system of the present invention includes an air compressor 1, an air dryer 2, an air circuit protection valve 3, a vehicle air tank 4, a minimum pressure valve 5, a pressure regulating valve 6, a transmission-specific air tank 7, a pressure sensor 8, a transmission TCU 9, an air filter 10, an operating mechanism 11 and a clutch actuator 12.

[0026] The outlet of air compressor 1 is connected to air dryer 2, the outlet of air dryer 2 is connected to one end of air circuit protection valve 3. The other end of air circuit protection valve 3 is connected to vehicle air tank 4, the outlet of which is connected to one end of minimum pressure valve 5, the other end of which is connected to one end of pressure regulating valve 6, the other end of which is connected to the air inlet of transmission air tank 7. The outlet of transmission air tank 7 is connected to air filter 10, which is connected to operating mechanism 11 and clutch actuator 12 respectively. Transmission air tank 7 is equipped with pressure sensor 8, whose data is connected to transmission control unit 9, which controls operating mechanism 11 and clutch actuator 12 for automatic shifting.

[0027] The hybrid transmission adopts a pneumatic shifting technology route, which requires that the operating mechanism 10 and the clutch actuator 11 are stable, clean, and dry, and the pressure must be 7.5 bar or a minimum of 6.5 bar to complete smooth and reliable shifting.

[0028] First, compressed air is generated by the vehicle's air compressor 1, dried by the air dryer 2, and then enters the air circuit protection valve 3. The dried air passes through the air circuit protection valve 3 and is evenly distributed to the vehicle's air tank 4. The compressed air in the vehicle's air tank 4 can only pass through the minimum pressure valve 5 when the pressure is greater than 4 bar. Otherwise, for vehicle safety reasons, when the compressed air pressure in the vehicle's air tank 4 is less than 4 bar, the minimum pressure valve 5 closes, preventing air from flowing to the transmission air tank to ensure adequate braking air flow. This also acts as a one-way valve, ensuring one-way flow of compressed air. When the compressed air pressure in the vehicle's air tank 4 exceeds 7.5 bar, or even reaches the limit of 8 bar, the pressure regulating valve 6 closes, preventing air from flowing to the transmission air tank 7. The pressure regulating valve 6 regulates the pressure in the transmission air tank 7 to 7.5 bar to meet subsequent usage requirements. Therefore, compressed air can only pass through the minimum pressure valve 5 and pressure regulating valve 6 and enter the transmission air tank 7 when the pressure is greater than 4 bar but less than or equal to 7.5 bar. A pressure sensor 8 is installed behind the transmission-specific air tank 7 to monitor the air pressure entering the air filter 10. Compressed air is filtered through the air filter 10 before reaching the operating mechanism 11 or clutch actuator 12. During this process, the transmission TCU 9 monitors the electrical signal from the pressure sensor 8 and calculates the compressed air pressure. Only when the pressure is greater than or equal to 6.5 bar will the transmission TCU 9, based on the vehicle's driving state, decide whether to transmit an electrical signal with a command to the solenoid valve of the operating mechanism 11 or the solenoid valve of the clutch actuator 12. This opens or closes the solenoid valve, controlling the duration and direction of the compressed air's action on the mechanical structures of the operating mechanism 11 or the clutch actuator 12, thereby achieving automatic shifting.

[0029] The present invention utilizes an air dryer 2 and an air filter 10 installed after the air compressor 1 to ensure that the gas is dry and clean, meeting ISO8573-1 and JED-848 standards; utilizes a minimum pressure valve 5 and a pressure regulating valve 6 to ensure sufficient air source pressure; utilizes a transmission-specific air tank 7 structure to ensure stable air supply; utilizes a pressure sensor 8 and a transmission TCU 9 to precisely control the operation of a control mechanism 11 and a clutch actuator 12; utilizes relevant acquisition equipment to collect DID data of the air pressure value in the transmission TCU 9 in real time through the vehicle's OBD interface, thereby facilitating after-sales personnel to quickly determine the transmission fault point and improving maintenance efficiency.

[0030] The present invention provides a method for controlling the air circuit of a hybrid transmission, comprising the following steps: the compressed air generated by the air compressor 1 is dried by the air dryer 2 and then evenly distributed to the vehicle air tank 4 by the air circuit protection valve 3. The compressed air is drawn from any vehicle air tank 4, passes through the minimum pressure valve 5 and the pressure regulating valve 6, and enters the transmission-specific air tank 7. When the compressed air is filled with gas, the air pressure of the transmission-specific air tank 7 is approximately 7.5 bar. When compressed air is needed, it passes through the air filter 10 from the transmission-specific air tank 7 and enters the operating mechanism 11 and the clutch actuator 12. When the transmission TCU 9 reads a pressure value of 6.5 bar or more from the pressure sensor 8 and determines that a gear shift is required based on the vehicle's movement, the solenoid valve of the operating mechanism 11 and the solenoid valve of the clutch actuator 12 are controlled by an electrical signal, and the compressed air is used to blow the internal mechanical structure of the operating mechanism 11 or the clutch actuator 12 to shift gears.

Claims

1. A hybrid transmission air circuit control system, characterized in that: It includes an air compressor (1), an air circuit protection valve (3), a vehicle air tank (4), a minimum pressure valve (5), a pressure regulating valve (6), a transmission-specific air tank (7), a pressure sensor (8), a transmission TCU (9), an operating mechanism (11), and a clutch actuator (12); The air outlet of the air compressor (1) is connected to one end of the air circuit protection valve (3), the other end of the air circuit protection valve (3) is connected to the vehicle air tank (4), the air outlet of the vehicle air tank (4) is connected to one end of the minimum pressure valve (5), the other end of the minimum pressure valve (5) is connected to one end of the pressure regulating valve (6), the other end of the pressure regulating valve (6) is connected to the air inlet of the transmission dedicated air tank (7), the air outlet of the transmission dedicated air tank (7) is respectively connected to the operating mechanism (11) and the clutch actuator (12), the transmission dedicated air tank (7) is provided with a pressure sensor (8), the data of the pressure sensor (8) is connected to the transmission TCU (9), and the transmission TCU (9) controls the operating mechanism (11) and the clutch actuator (12) to perform automatic shifting; When the compressed air pressure in the vehicle gas tank (4) is greater than 4 bar, the compressed air passes through the minimum pressure valve (5); when the compressed air pressure in the vehicle gas tank (4) is greater than 7.5 bar, the pressure regulating valve (6) is closed and no air is supplied to the transmission gas tank (7). The pressure regulating valve (6) can adjust the air pressure in the transmission gas tank (7) to 7.5 bar. When the pressure value of the transmission dedicated air tank (7) monitored by the pressure sensor (8) is greater than or equal to 6.5 bar, the solenoid valve of the transmission TCU (9) operating mechanism (11) or the solenoid valve of the clutch actuator (12) performs automatic gear shifting.

2. The hybrid transmission air circuit control system according to claim 1, characterized in that: The air outlet of the transmission-specific air tank (7) is connected to an air filter (10), and the air filter (10) is respectively connected to an operating mechanism (11) and a clutch actuator (12).

3. The hybrid transmission air circuit control system according to claim 1, characterized in that: The air outlet of the air compressor (1) is connected to an air dryer (2), and the air outlet of the air dryer (2) is connected to one end of an air path protection valve (3).

4. The hybrid transmission air circuit control system according to claim 1, characterized in that: When the pressure of the compressed air is greater than 4 bar and less than or equal to 7.5 bar, the compressed air passes through the minimum pressure valve (5) and the pressure regulating valve (6) and enters the transmission dedicated air tank (7).

5. A method for controlling the gas circuit of a hybrid transmission, characterized in that: Including the following process, The compressed air generated by the air compressor (1) is evenly distributed to the vehicle gas tank (4) by the air path protection valve (3); the compressed air is drawn from any vehicle gas tank (4), passes through the minimum pressure valve (5) and the pressure regulating valve (6), and enters the transmission dedicated gas tank (7); When compressed air is needed, the compressed air enters the operating mechanism (11) and the clutch actuator (12) from the transmission dedicated air tank (7); when the transmission TCU (9) reads a pressure value of 6.5 bar or more from the pressure sensor (8), it is determined that a gear shift is required based on the movement of the entire vehicle, and the solenoid valve of the operating mechanism (11) and the solenoid valve of the clutch actuator (12) are controlled by an electrical signal, and the compressed air is used to blow the internal mechanical structure of the operating mechanism (11) or the clutch actuator (12) to shift gears.

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