Multifunctional air pressure auxiliary braking system of electric commercial vehicle and control method

Abstract

The invention discloses a multifunctional air pressure auxiliary braking system of an electric commercial vehicle and a control method, and the multifunctional air pressure auxiliary braking system comprises an accelerator pedal, an accelerator pedal pressure sensor, a vehicle speed sensor, a brake pedal, a brake pedal pressure sensor and an electronic air pressure braking system assembly, the system comprises an air pressure auxiliary braking system assembly, an air pressure auxiliary braking system clutch device, a parking brake and a main controller. The electric commercial vehicle has the function of saving energy, wheels of the electric commercial vehicle can be driven to rotate through ground friction force by means of kinetic energy of the vehicle when the vehicle is braked, then a driving motor shaft is driven to rotate through a transmission system, and an auxiliary air compressor is driven to work through an air pressure auxiliary system clutch device, so that high-pressure air in an air storage cylinder is supplemented; and the energy consumed by the electric commercial vehicle during long downhill braking or deceleration braking can be greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile braking systems, and specifically relates to a multifunctional air pressure auxiliary braking system and a control method for an electric commercial vehicle. Background Art

[0002] With the rapid growth of the number of cars in the world, the energy consumption and safety issues of traditional cars are becoming more and more prominent. Especially for heavy commercial vehicles, the safety of high-speed driving and the energy utilization during braking are particularly important. In order to deal with these problems, the automotive industry is actively exploring ways to improve vehicle operating efficiency and reduce costs.

[0003] For heavy-duty commercial vehicles, the key to ensuring their braking reliability lies in the strong braking force supply, so almost all heavy-duty commercial vehicles use pneumatic brake systems. In addition, some electric drive commercial vehicles have introduced regenerative braking energy recovery technology to reduce energy loss and thus increase the vehicle's cruising range.

[0004] In the existing commercial vehicle auxiliary braking technology, some innovative technical solutions have been proposed, such as a truck auxiliary braking system working method disclosed in the Chinese invention patent application number CN202410270682.1, which uses a planetary gear mechanism to flexibly change the air pressure of the auxiliary brake air reservoir to ensure the stability of the brake, and can dissipate heat from the brake through high-pressure air to improve the braking effect. However, this technology still relies on an internal combustion engine or motor to pressurize the air reservoir, which means that the kinetic energy of the vehicle cannot be utilized during the braking process, but is completely dissipated in the form of heat energy.

[0005] On the other hand, there are also relevant technical advances in the field of electric commercial vehicle brake energy recovery systems. For example, the Chinese invention patent application number CN201910765142.X discloses a brake energy recovery system and control method for electric commercial vehicles. The system obtains real-time vehicle information through an on-board communication network (such as a CAN bus) and on-board sensors, and formulates a reasonable braking strategy based on this information. This method enables electric vehicles to achieve coordinated control of pneumatic braking and electric braking under conventional braking conditions, thereby improving the rationality of braking force distribution. However, this technology mainly recovers braking energy by driving the motor in reverse, which results in low recovery efficiency due to the long energy transfer path. Especially in the case of emergency braking, in order to quickly obtain sufficient braking force, the energy recovery system is usually turned off, which results in a large amount of braking energy being wasted. Summary of the invention

[0006] In view of the above-mentioned deficiencies of the prior art, the present invention aims to improve the energy efficiency of electric commercial vehicles and enhance the reliability and functionality of their braking systems. Specifically, the present invention can replenish the high-pressure gas reserve in the gas reservoir by converting the vehicle's kinetic energy into high-pressure gas during vehicle braking, thereby significantly reducing the energy consumed during long downhill braking or deceleration braking.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: The multifunctional pneumatic auxiliary brake system for electric commercial vehicles of the present invention comprises the following parts: an accelerator pedal and an accelerator pedal pressure sensor connected thereto; a main controller for processing data from the accelerator pedal pressure sensor; a vehicle speed sensor connected to the main controller to provide vehicle speed information; a brake pedal and a brake pedal pressure sensor connected thereto; the main controller receives data from the brake pedal pressure sensor; and is characterized in that it also comprises: an electronic pneumatic brake system assembly, a pneumatic auxiliary brake system assembly and a clutch device of the pneumatic auxiliary brake system; The electronic pneumatic brake system assembly includes: an air reservoir with multiple interfaces and an oil and water discharge port; a first one-way valve connected to the air inlet port 1 of the air reservoir; an electric air compressor connected to the first one-way valve through a pipeline; a motor that drives the electric air compressor to work; a unloading valve connected to the electric air compressor; a pressure regulator connected to the electric air compressor; a safety valve connected to the air outlet port 3 of the air reservoir; an air reservoir pressure sensor installed in a pipeline between the air outlet port 4 of the air reservoir and the air inlet of the brake control valve; the air outlet of the brake control valve is connected to the brake air chamber through a pipeline; a brake air chamber pressure sensor is installed in a pipeline between the air outlet of the brake control valve and the brake air chamber; an oil and water release valve connected to the oil and water release port of the air reservoir; the oil and water release valve is used to release the oil and water in the air reservoir to keep the pipeline gas dry and prevent it from further corroding components.

[0008] The air pressure auxiliary brake system assembly includes: a second one-way valve connected to the second air inlet of the air reservoir; an auxiliary air compressor connected to the second one-way valve through a pipeline; a driven pulley connected to the auxiliary air compressor; an unloading valve and a pressure regulator auxiliary air compressor; The clutch device of the air pressure auxiliary brake system includes: a driving gear on the drive motor shaft; a driven gear installed on the drive motor shaft and meshing with the driving gear; a sun gear installed on the sun gear shaft through a spline and connected to the driven gear on the drive motor shaft; a planetary gear, loosely sleeved on the planetary carrier and meshing with the sun gear; a ring gear wrapped around the planetary gear and meshing with the planetary gear; a planetary carrier controlled by a planetary carrier brake, loosely sleeved on the sun gear shaft; a driving pulley coaxially connected to the ring gear and connected to the driven pulley through a belt; The main controller is not only connected to the above-mentioned motor, electric air compressor unloading valve, pressure regulator, auxiliary air compressor unloading valve, pressure regulator, air reservoir pressure sensor, brake air chamber pressure sensor, brake control valve, but also receives signals from the air reservoir pressure sensor, brake air chamber pressure sensor, vehicle speed sensor, brake pedal pressure sensor, and accelerator pedal pressure sensor. The main controller adjusts the motor speed, controls the unloading valve switch of the electric air compressor and the auxiliary air compressor, adjusts the state of the brake control valve and the working mode of the planetary carrier brake, and adjusts the pressure regulator settings of the electric air compressor and the auxiliary air compressor according to these input signals.

[0009] Furthermore, the air cylinder pressure sensor is used to monitor the pressure in the air cylinder, and the pressure has two threshold states, including threshold 1 state and threshold 2 state, and threshold 1 and threshold 2 states are controlled by the electric air compressor pressure regulator, the auxiliary air compressor pressure regulator, the electric air compressor unloading valve, the auxiliary air compressor unloading valve and the safety valve. It is used to adjust the pressure in the air pipe within the set range. It is used to adjust the air pressure to prevent the air pressure from being too high to protect the equipment. The safety valve is used to limit the pressure in the air outlet barrel to prevent the pressure from being too high to damage the equipment.

[0010] Furthermore, the threshold 1 state is defined as the pressure at which the high-pressure gas in the gas cylinder can support the vehicle to complete two consecutive braking operations, and the threshold 2 state is defined as the pressure at which the high-pressure gas in the gas cylinder can support the vehicle to complete nine consecutive braking operations.

[0011] Furthermore, the clutch device of the pneumatic auxiliary system controls the input of the planetary carrier through the planetary carrier brake, thereby changing the transmission of power. When the planetary carrier brake is braked, the input speed of the planetary carrier is zero, and the power is transmitted to the driven gear of the driving motor shaft through the driving gear of the driving motor shaft. The driven gear of the driving motor shaft transmits the power to the sun gear, and the sun gear transmits the power to the planetary gear. The planetary gear then transmits the power to the ring gear. The ring gear completely transmits the power to the driving pulley, and the driving pulley transmits the power to the driven pulley through the belt. The driven pulley drives the auxiliary air compressor to compress the gas into the air storage cylinder. When the planetary carrier brake is released, the auxiliary air compressor stops working.

[0012] Furthermore, the drive motor shaft is a component of the vehicle power system, which can transmit torque to the wheels for the vehicle to move; the parking brake is a component of the vehicle braking system, which can achieve long-term braking when the vehicle is turned off.

[0013] A multifunctional air pressure assisted braking control method for an electric commercial vehicle comprises the following steps: The main controller receives information from the vehicle speed sensor, the air reservoir pressure sensor, the accelerator pedal pressure sensor and the brake pedal pressure sensor, and controls the working state of the electronic pneumatic brake system and the auxiliary pneumatic brake system according to the received information; The main controller receives the brake pedal pressure sensor signal and the air reservoir pressure sensor signal, and controls the working state of the auxiliary air pressure brake system through the pressure signal transmitted by the air reservoir pressure sensor; When the brake pedal is pressed, the main controller calculates the theoretical pressure required for the brake chamber based on the brake pedal pressure, and receives the pressure information collected by the brake chamber pressure sensor for judgment. When the pressure in the brake chamber is lower than the theoretical pressure, the main controller controls the brake control valve to increase the pressure to supplement the pressure in the brake chamber; when the pressure in the brake chamber is higher than the theoretical pressure, the main controller controls the brake control valve to reduce the pressure to keep the pressure in the brake chamber at the theoretical pressure value.

[0014] Furthermore, step 1) also includes: 11) After receiving the vehicle ignition signal, if the vehicle is in the off state, the main controller controls the planetary carrier brake to brake for a long time, so that the auxiliary air pressure brake system is in the pre-working state and the parking brake is turned on; 12) If the vehicle is in the ignition state, the main controller receives the signal from the air reservoir pressure sensor and controls the working state of the electronic pneumatic brake system accordingly; 13) If the vehicle is in the ignition state and the vehicle speed is zero, the main controller controls the planetary carrier brake to brake, so that the auxiliary air pressure brake system is in the pre-working state and the parking brake is turned off; 14) If the vehicle is in ignition state and the accelerator pedal is depressed, the main controller controls the planetary carrier brake to release, thereby stopping the auxiliary air brake system; 15) If the vehicle is in the ignition state and the vehicle speed is zero signal and the accelerator pedal is pressed signal exist at the same time, the main controller controls the planetary carrier brake to release, so that the auxiliary air pressure brake system stops working; 16) If the vehicle is in the ignition state and the vehicle speed is not zero, the main controller receives the signal from the brake pedal sensor to control the working state of the auxiliary air brake system.

[0015] Furthermore, the main controller in step 12) controls the working state of the electronic pneumatic brake system specifically including: 121) The main controller receives the signal from the air tank pressure sensor; 122) When the air reservoir pressure is less than threshold 1, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to close, so that the electric air compressor compresses air into the air reservoir; 123) When the air tank pressure is greater than threshold 1 and less than threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to close, so that the electric air compressor stops working; 124) When the air reservoir pressure is greater than threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to open, so that the electric air compressor stops working. Threshold 1 is defined as the pressure when the high-pressure gas in the air reservoir can support the vehicle to complete two consecutive brakings, and threshold 2 is defined as the pressure when the high-pressure gas in the air reservoir can support the vehicle to complete nine consecutive brakings.

[0016] Furthermore, the main controller in step 16) controls the working state of the auxiliary air pressure brake system specifically including: 161) The main controller receives a brake pedal pressure sensor signal; 162) When the brake pedal is pressed, the main controller controls the planetary carrier brake to brake; 163) The main controller receives the signal from the air reservoir pressure sensor. If the pressure value collected by the air reservoir pressure sensor exceeds the threshold value 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to open and release part of the high-pressure gas; 164) If the pressure value collected by the air reservoir pressure sensor is lower than threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to close, so that the auxiliary air compressor compresses air into the air reservoir; 165) When the brake pedal is released, the main controller controls the planetary carrier brake to release. ; Threshold 1 is defined as the pressure when the high-pressure gas in the gas reservoir can support the vehicle to complete two consecutive brakings, and threshold 2 is defined as the pressure when the high-pressure gas in the gas reservoir can support the vehicle to complete nine consecutive brakings.

[0017] Further, the working process of the planetary carrier brake in step 162) specifically includes: 1621) The torque on the drive motor shaft is transmitted through the driving gear on the drive motor shaft, so that the driving gear on the drive motor shaft drives the driven gear on the drive motor shaft to rotate and transmits the torque to the driven gear on the drive motor shaft; 1622) The driven gear on the drive motor shaft drives the sun gear to rotate synchronously and transmits the torque to the sun gear; 1623) The main controller sends a braking command to the planetary carrier brake, the planetary carrier brake is braked, the planetary carrier input speed is zero, and the planetary gear revolution is restricted; 1624) The sun gear drives the planetary gears to rotate and transmits all the torque to the planetary gears; 1625) The rotation of the planetary gear drives the ring gear to rotate and completely transmits the torque to the ring gear; 1626) The ring gear rotates synchronously with the driving pulley and transmits all the torque to the driving pulley; 1627) The driving pulley drives the driven pulley through the belt and transmits the torque to the driven pulley, which in turn drives the auxiliary air compressor to work. The auxiliary air compressor presses the high-pressure air into the air reservoir to ensure that a certain pressure is established in the air reservoir; 1628) The main controller controls the planetary carrier brake of the air pressure auxiliary system clutch device to release, the planetary gear has no input, the torque of the driving gear on the drive motor shaft cannot be transmitted to the ring gear, and the auxiliary air compressor stops working.

[0018] Technical features and beneficial effects of the present invention: Technical features: Energy recovery function: The present invention utilizes the ground friction to drive the wheels to rotate when the vehicle brakes, and then drives the motor shaft to rotate through the transmission system. On this basis, the pneumatic auxiliary system clutch device drives the auxiliary air compressor to work, converting the vehicle's kinetic energy into high-pressure gas in the air reservoir. This process effectively recovers the energy that was originally dissipated in the form of heat energy during braking, thereby reducing the energy loss of electric commercial vehicles during long downhill braking or deceleration braking.

[0019] Auxiliary braking function: The present invention also has auxiliary braking capability. If the electric air compressor fails during the driving of the electric commercial vehicle, the present invention can use the vehicle's own kinetic energy to brake. The higher the wheel speed, the faster the high-pressure gas in the air reservoir is replenished, so that the necessary braking force can be quickly provided to stop the vehicle in time. This provides additional safety for the vehicle, especially in the event of failure of the electric air compressor.

[0020] Anti-slope rolling function: In addition, the present invention can also effectively prevent the electric commercial vehicle from rolling down a slope when the parking brake system fails or the driver does not turn off the engine to park the vehicle. Using the vehicle's own kinetic energy for braking can significantly reduce the speed of rolling down a slope, giving the driver ample time to solve the problem while reducing the potential dangers caused by rolling down a slope.

[0021] Beneficial effects: Through the above technical means, the present invention not only realizes the effective recovery and utilization of energy, but also enhances the stability and safety of the vehicle braking system. Under various adverse conditions, the present invention can provide a reliable auxiliary braking function to ensure the controllability and safety of the vehicle in emergency situations. In addition, by reducing energy loss, the present invention also helps to extend the cruising range of electric commercial vehicles and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural principle diagram of the system of the present invention; Figure 2 It is a schematic diagram of the principle of the clutch device of the air pressure auxiliary system of the present invention; Figure 3This is a flow chart of the control method of the present invention; Figure 1 In: 1-motor, 2-electric air compressor, 3-electric air compressor unloading valve, 4-electric air compressor pressure regulator, 5-first one-way valve, 6-air reservoir, 7-safety valve, 8-oil and water release valve, 9-second one-way valve, 10-auxiliary air compressor pressure regulator, 11-auxiliary air compressor unloading valve, 12-auxiliary air compressor, 13-driven pulley, 14-air reservoir pressure sensor, 15-brake pedal, 16-brake control valve, 17-brake air chamber, 18-brake air chamber pressure sensor; Figure 2 Middle: 19-driving pulley, 20-gear ring, 21-planetary gear, 22-planet carrier, 23-planet carrier brake, 24-driving motor shaft driven gear, 25-sun gear shaft, 26-driving motor shaft, 27-driving motor shaft driving gear, 28-sun gear. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0024] Reference Figure 1 , Figure 2 As shown, a multifunctional pneumatic assisted braking system for an electric commercial vehicle of the present invention comprises: an accelerator pedal, an accelerator pedal pressure sensor, a vehicle speed sensor, a brake pedal 15, a brake pedal pressure sensor, an electronic pneumatic brake system assembly, a pneumatic assisted brake system assembly, a pneumatic assisted brake system clutch device, a parking brake and a main controller; wherein, The accelerator pedal is connected to the accelerator pedal pressure sensor; The accelerator pedal pressure sensor is connected to the main controller; The vehicle speed sensor is connected to the main controller; The brake pedal 15 is connected to a brake pedal pressure sensor; The brake pedal pressure sensor is connected to the main controller; The electronic pneumatic brake system assembly includes: an air reservoir 6, a motor 1, an electric air compressor 2, an electric air compressor unloading valve 3, an electric air compressor pressure regulator 4, a safety valve 7, a first non-return valve 5, an oil and water release valve 8, an air reservoir pressure sensor 14, a brake control valve 16, a brake air chamber 17 and a brake air chamber pressure sensor 18; The air storage cylinder 6 has two air inlets, namely, air inlet 1 and air inlet 2, four air outlets, namely, air outlet 1, air outlet 2, air outlet 3 and air outlet 4, and an oil and water discharge port; The air inlet 1 of the air storage cylinder 6 is connected to the first one-way valve 5, the first one-way valve 5 is connected to the electric air compressor 2 through an air pipe, the electric air compressor 2 is connected to the motor 1, and the motor 1 drives the compressed air, the electric air compressor unloading valve 3 of the electric air compressor 2 is connected to the electric air compressor pressure regulator 4 through an air pipe, and the electric air compressor pressure regulator 4 is connected to the air outlet 1 of the air storage cylinder 6 through an air pipe; The air outlet three of the air cylinder 6 is connected to the safety valve 7, the air outlet four of the air cylinder 6 is connected to the air inlet of the brake control valve 16 through an air pipe, the air cylinder pressure sensor 14 is installed between the air outlet four and the air pipe of the air inlet of the brake control valve 16, the air outlet of the brake control valve 16 is connected to the brake air chamber 17 through an air pipe, the brake air chamber pressure sensor 18 is installed between the air outlet four of the brake control valve 16 and the air pipe of the brake air chamber 17, and the oil and water discharge port of the air cylinder 6 is connected to the oil and water discharge valve 8.

[0025] The air pressure auxiliary brake system assembly includes a second one-way valve 9, an auxiliary air compressor 12, an auxiliary air compressor unloading valve 11, an auxiliary air compressor pressure regulator 10, and a driven pulley 13; The air inlet 2 of the air storage cylinder 6 is connected to the second one-way valve 9, the second one-way valve 9 is connected to the auxiliary air compressor 12 through an air pipe, the auxiliary air compressor 12 is connected to the driven pulley 13, and the compressed air is driven by the rotating driven pulley 13, the auxiliary air compressor unloading valve 11 of the auxiliary air compressor 12 is connected to the auxiliary air compressor pressure regulator 10 through an air pipe, and the auxiliary air compressor pressure regulator 10 is connected to the air outlet 2 of the air storage cylinder 6 through an air pipe; The pneumatic auxiliary system clutch device includes: a driving motor shaft driving gear 27, a driving motor shaft driven gear 24, a gear ring 20, a planetary gear 21, a sun gear 28, a sun gear shaft 25, a planetary carrier 22, a planetary carrier brake 23 and a driving pulley 19; the planetary carrier brake 23 is connected to the main controller and controlled by the main controller; the driving motor shaft driving gear 27 is installed on the driving motor shaft 26 through a spline and meshes with the driving motor shaft driven gear 24; the driving motor shaft driven gear 24 is installed on the sun gear shaft 25 through a spline ; The sun gear 28 is mounted on the sun gear shaft 25 through a spline; the planetary gear 21 is loosely mounted on the planetary carrier 22 and meshes with the sun gear 28; the ring gear 20 meshes with the planetary gear 21; the ring gear 20 wraps around the planetary gear 21, and the planetary gear 21 surrounds the sun gear 28. The rotation axis of the sun gear 28 is colinear with the rotation axis of the ring gear 20, and the planetary carrier 22 is loosely mounted on the sun gear shaft 25 and controlled by the planetary carrier brake 23; the driving pulley 19 is coaxially connected to the ring gear 20; the driving pulley 19 is connected to the driven pulley 13 through a belt.

[0026] The first one-way valve 5 and the second one-way valve 9 can only allow the high-pressure gas to flow from the gas pipe to the gas storage cylinder 6; The electric air compressor unloading valve 3 and the auxiliary air compressor unloading valve 11 are used to adjust the air pressure to prevent the air pressure from being too high to protect the equipment.

[0027] The electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 are used to adjust the pressure in the air pipe within a set range.

[0028] The safety valve 7 is used to limit the pressure in the gas outlet barrel to prevent excessive pressure from damaging the equipment.

[0029] The oil-water release valve 8 is used to release the oil and water in the gas storage cylinder 6 to keep the pipeline gas dry and prevent it from further corroding the components.

[0030] The brake control valve 16 has an air inlet and a plurality of air outlets, which are connected to the brake pedal 15 and controlled by the brake pedal 15. The number of the air outlets depends on the number of the brake air chambers 17. When the brake pedal 15 is pressed, the brake control valve 16 opens, and the high-pressure gas in the air reservoir 6 enters the brake air chamber 17, thereby applying braking force to the wheels to slow down the vehicle. When the brake pedal 15 is released, the brake control valve 16 closes, and the high-pressure gas in the brake air chamber 17 is released, and the wheels have no braking force.

[0031] The main controller is electrically connected to the motor 1, the electric air compressor unloading valve 3, the electric air compressor pressure regulator 4, the auxiliary air compressor unloading valve 11, the auxiliary air compressor pressure regulator 10, the air reservoir pressure sensor 14, the brake air chamber pressure sensor 18, and the brake control valve 16 through connecting lines; the main controller receives signals from the air reservoir pressure sensor 14, the brake air chamber pressure sensor 18, the vehicle speed sensor, the brake pedal pressure sensor, and the accelerator pedal pressure sensor, controls the speed of the motor 1, the opening and closing states of the electric air compressor unloading valve 3, the auxiliary air compressor unloading valve 11, the brake control valve 16, and the working state of the planetary carrier brake 23, and adjusts the threshold range of the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10.

[0032] The air cylinder pressure sensor 14 is used to monitor the pressure in the air cylinder 6. The pressure has two threshold states, including threshold 1 state and threshold 2 state. The threshold 1 and threshold 2 states are controlled by the electric air compressor pressure regulator 4, the auxiliary air compressor pressure regulator 10, the electric air compressor unloading valve 3, the auxiliary air compressor unloading valve 11 and the safety valve 7.

[0033] The threshold 1 state is defined as the pressure at which the high-pressure gas in the gas cylinder 6 can support the vehicle to complete two consecutive braking operations. The threshold 2 state is defined as the pressure at which the high-pressure gas in the gas cylinder 6 can support the vehicle to complete nine consecutive braking operations.

[0034] The clutch device of the pneumatic auxiliary system controls the input of the planetary carrier 22 through the planetary carrier brake 23, thereby changing the transmission of power. When the planetary carrier brake 23 is braked, the input speed of the planetary carrier 22 is zero, and the power is transmitted to the driven gear 24 of the driving motor shaft through the driving motor shaft driving gear 27. The driven gear 24 of the driving motor shaft transmits the power to the sun gear 28. The sun gear 28 transmits the power to the planetary gear 21. The planetary gear 21 transmits the power to the ring gear 20. The ring gear 20 completely transmits the power to the driving pulley 19. The driving pulley 19 transmits the power to the driven pulley 13 through the belt. The driven pulley 13 drives the auxiliary air compressor 12 to work and compress the gas into the air storage cylinder 6. When the planetary carrier brake 23 is released, the auxiliary air compressor 12 stops working.

[0035] The driving motor shaft 26 is a component of the vehicle power system, and can transmit torque to the wheels for the vehicle to travel.

[0036] The parking brake is a component of the vehicle's braking system, which enables long-term braking when the vehicle is turned off.

[0037] A multifunctional air pressure assisted braking control method for an electric commercial vehicle of the present invention is based on the above system and comprises the following steps: 1) The main controller receives the information collected by the vehicle speed sensor, the air reservoir pressure sensor 14, the accelerator pedal pressure sensor and the brake pedal pressure sensor, and controls the working state of the electronic pneumatic brake system and the auxiliary pneumatic brake system according to the received information; 2) The main controller receives the brake pedal pressure sensor signal and the air reservoir pressure sensor 14 signal, and controls the working state of the auxiliary air pressure brake system through the pressure signal transmitted by the air reservoir pressure sensor 14; 3) When the brake pedal 15 is pressed, the main controller calculates the theoretical pressure required for the brake air chamber 17 according to the pressure of the brake pedal 15. The main controller receives the pressure information collected by the brake air chamber pressure sensor 18 and makes a judgment. When the pressure in the brake air chamber 17 is lower than the theoretical pressure, the main controller controls the brake control valve 16 to increase the pressure to supplement the pressure in the brake air chamber 17; when the pressure in the brake air chamber 17 is higher than the theoretical pressure, the main controller controls the brake control valve 16 to reduce the pressure, so that the pressure in the brake air chamber 17 is maintained at the theoretical pressure value.

[0038] The main controller in step 1) controls the electronic pneumatic brake system and the auxiliary pneumatic brake system to work, which specifically includes the following steps: 11) The main controller receives the vehicle ignition signal. When the vehicle is in the off state, the main controller controls the planetary carrier brake 23 to brake for a long time, thereby controlling the auxiliary air pressure brake system to be in the pre-working state and the parking brake is turned on; 12) When the vehicle is in the ignition state, the main controller receives the air tank pressure sensor signal 18 and controls the working state of the electronic pneumatic brake system.

[0039] 13) When the vehicle is in the ignition state and the vehicle speed is zero, the main controller controls the planetary carrier brake 23 to brake, thereby controlling the auxiliary air pressure brake system to be in the pre-working state, and the parking brake is closed; 14) When the vehicle is in the ignition state, the main controller receives the accelerator pedal depressed signal sent by the accelerator pedal sensor, and the main controller controls the planetary carrier brake 23 to release, thereby controlling the auxiliary air pressure brake system to stop working; 15) When the vehicle is in the ignition state, and the vehicle speed is zero and the accelerator pedal is pressed signal exists at the same time, the main controller controls the planetary carrier brake 23 to release, thereby controlling the auxiliary air pressure brake system to stop working; 16) When the vehicle is in the ignition state and the vehicle speed is not zero, the main controller receives the signal from the brake pedal sensor to control the working state of the auxiliary air brake system.

[0040] The main controller in step 12) controls the working state of the electronic pneumatic brake system, which specifically includes the following steps: 121) The main controller receives the signal from the air tank pressure sensor 14; 122) When the pressure of the air reservoir 6 is less than the threshold value 1, the main controller controls the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 to be closed, and the electric air compressor 2 compresses air into the air reservoir 6; 123) When the pressure of the air reservoir 6 is greater than the threshold 1 and less than the threshold 2, the main controller controls the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 to close, and the electric air compressor 2 stops working; 124) When the air storage tank pressure 6 is greater than the threshold value 2, the main controller controls the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 to open, and the electric air compressor 2 stops working.

[0041] The main controller in step 16) controls the working state of the auxiliary air pressure brake system, which specifically includes the following steps: 161) The main controller receives a brake pedal pressure sensor signal; 162) When the brake pedal 15 is depressed, the main controller controls the planetary carrier brake 23 to brake; 163) the main controller receives a signal from the air reservoir pressure sensor 14, and the pressure value collected by the air reservoir pressure sensor 14 exceeds the threshold 2, and the main controller controls the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 to open and release part of the high-pressure gas; 164) The pressure value collected by the air reservoir pressure sensor 14 is lower than the threshold value 2, the main controller controls the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 to be turned off, and the auxiliary air compressor 12 compresses air into the air reservoir 6; 165) When the brake pedal 15 is released, the main controller controls the planetary carrier brake 23 to be released.

[0042] The working process of the planetary carrier brake 23 in step 162) specifically includes the following steps: 1621) The torque on the drive motor shaft 26 is transmitted downward through the drive motor shaft driving gear 27, and the drive motor shaft driving gear 27 drives the drive motor shaft driven gear 24 to rotate and transmits the torque to the drive motor shaft driven gear 24; 1622) The driven gear 24 of the driving motor shaft drives the sun gear 28 to rotate synchronously and transmits the torque to the sun gear 28; 1623) The main controller sends a braking command to the planetary carrier brake 23, the planetary carrier brake 23 brakes, the input speed of the planetary carrier 22 is zero, and the revolution of the planetary gear 21 is restricted; 1624) The sun gear 28 drives the planetary gear 21 to rotate and transmits all the torque to the planetary gear 21; 1625) The planetary gear 21 rotates to drive the ring gear 20 to rotate, and completely transmits the torque to the ring gear 20; 1626) The ring gear 20 rotates synchronously with the driving pulley 19 and transmits all the torque to the driving pulley 19; 1627) The driving pulley 19 drives the driven pulley 13 through the belt, and transmits the torque to the driven pulley 13, thereby driving the auxiliary air compressor 12 to work. The auxiliary air compressor 12 presses the high-pressure air into the air reservoir 6 to ensure that a certain pressure is established in the air reservoir 6; 1628) The main controller controls the planetary carrier brake 23 of the air pressure auxiliary system clutch device to release, the planetary gear 21 has no input, the torque of the driving motor shaft active gear 27 cannot be transmitted to the ring gear 20, and the auxiliary air compressor 12 stops working.

[0043] The present invention has many specific application paths. The above are only preferred implementation modes of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements without departing from the principles of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A multifunctional air pressure assisted braking system for an electric commercial vehicle, comprising the following parts: an accelerator pedal and an accelerator pedal pressure sensor connected thereto; a main controller for processing data from an accelerator pedal pressure sensor; a vehicle speed sensor connected to the main controller to provide vehicle speed information; a brake pedal and its connected brake pedal pressure sensor; The main controller receives data from the brake pedal pressure sensor; it is characterized by: it also includes: an electronic pneumatic brake system assembly, a pneumatic auxiliary brake system assembly and a clutch device of the pneumatic auxiliary brake system; The electronic pneumatic brake system assembly includes: an air reservoir having multiple interfaces and an oil-water discharge port; a first one-way valve connected to an air inlet port 1 of the air reservoir; an electric air compressor connected to the first one-way valve through a pipeline; a motor driving the electric air compressor; an unloading valve connected to the electric air compressor; a pressure regulator connected to the electric air compressor; a safety valve connected to an air outlet port 3 of the air reservoir; an air reservoir pressure sensor installed in a pipeline between an air outlet port 4 of the air reservoir and an air inlet port of a brake control valve; an air outlet port of the brake control valve connected to a brake air chamber through a pipeline; a brake air chamber pressure sensor installed in a pipeline between an air outlet port of the brake control valve and the brake air chamber; an oil-water discharge valve connected to an oil-water discharge port of the air reservoir; The air pressure auxiliary brake system assembly includes: a second one-way valve connected to the second air inlet of the air reservoir; an auxiliary air compressor connected to the second one-way valve through a pipeline; a driven pulley connected to the auxiliary air compressor; an unloading valve and a pressure regulator auxiliary air compressor; The clutch device of the air pressure auxiliary brake system includes: a driving gear on the drive motor shaft; a driven gear installed on the drive motor shaft and meshing with the driving gear; a sun gear installed on the sun gear shaft through a spline and connected to the driven gear on the drive motor shaft; a planetary gear, loosely sleeved on the planetary carrier and meshing with the sun gear; a ring gear wrapped around the planetary gear and meshing with the planetary gear; a planetary carrier controlled by a planetary carrier brake, loosely sleeved on the sun gear shaft; a driving pulley coaxially connected to the ring gear and connected to the driven pulley through a belt; The main controller is not only connected to the above-mentioned motor, electric air compressor unloading valve, pressure regulator, auxiliary air compressor unloading valve, pressure regulator, air reservoir pressure sensor, brake air chamber pressure sensor, brake control valve, but also receives signals from the air reservoir pressure sensor, brake air chamber pressure sensor, vehicle speed sensor, brake pedal pressure sensor, and accelerator pedal pressure sensor. The main controller adjusts the motor speed, controls the unloading valve switch of the electric air compressor and the auxiliary air compressor, adjusts the state of the brake control valve and the working mode of the planetary carrier brake, and adjusts the pressure regulator settings of the electric air compressor and the auxiliary air compressor according to these input signals.

2. The system according to claim 1, characterized in that The air cylinder pressure sensor is used to monitor the pressure in the air cylinder. The pressure has two threshold states, including threshold 1 state and threshold 2 state. Threshold 1 and threshold 2 states are controlled by the electric air compressor pressure regulator, the auxiliary air compressor pressure regulator, the electric air compressor unloading valve, the auxiliary air compressor unloading valve and the safety valve.

3. The system according to claim 2, characterized in that The threshold 1 state is defined as the pressure at which the high-pressure gas in the gas reservoir can support the vehicle to complete two consecutive braking operations. The threshold 2 state is defined as the pressure at which the high-pressure gas in the gas reservoir can support the vehicle to complete nine consecutive braking operations.

4. The system according to claim 1, characterized in that The pneumatic auxiliary system clutch device controls the input of the planetary carrier through the planetary carrier brake, thereby changing the transmission of power. When the planetary carrier brake is braked, the planetary carrier input speed is zero, and the power is transmitted to the driven gear of the driving motor shaft through the driving gear of the driving motor shaft. The driven gear of the driving motor shaft transmits the power to the sun gear, and the sun gear transmits the power to the planetary gear. The planetary gear then transmits the power to the ring gear. The ring gear completely transmits the power to the driving pulley. The driving pulley transmits the power to the driven pulley through the belt. The driven pulley drives the auxiliary air compressor to work and compress the gas into the air storage cylinder. When the planetary carrier brake is released, the auxiliary air compressor stops working.

5. The system according to claim 1, characterized in that The drive motor shaft is a component of the vehicle power system, which can transmit torque to the wheels for the vehicle to travel; the parking brake is a component of the vehicle braking system, which can achieve long-term braking when the vehicle is turned off.

6. A multifunctional air pressure assisted braking control method for an electric commercial vehicle, characterized in that: The following steps are involved: The main controller receives information from the vehicle speed sensor, the air reservoir pressure sensor, the accelerator pedal pressure sensor and the brake pedal pressure sensor, and controls the working state of the electronic pneumatic brake system and the auxiliary pneumatic brake system according to the received information; The main controller receives the brake pedal pressure sensor signal and the air reservoir pressure sensor signal, and controls the working state of the auxiliary air pressure brake system through the pressure signal transmitted by the air reservoir pressure sensor; When the brake pedal is pressed, the main controller calculates the theoretical pressure required for the brake chamber based on the brake pedal pressure, and receives the pressure information collected by the brake chamber pressure sensor for judgment. When the pressure in the brake chamber is lower than the theoretical pressure, the main controller controls the brake control valve to increase the pressure to supplement the pressure in the brake chamber; when the pressure in the brake chamber is higher than the theoretical pressure, the main controller controls the brake control valve to reduce the pressure to keep the pressure in the brake chamber at the theoretical pressure value.

7. The method according to claim 6, characterized in that Step 1) also includes: 11) After receiving the vehicle ignition signal, if the vehicle is in the off state, the main controller controls the planetary carrier brake to brake for a long time, so that the auxiliary air pressure brake system is in the pre-working state and the parking brake is turned on; 12) If the vehicle is in the ignition state, the main controller receives the signal from the air reservoir pressure sensor and controls the working state of the electronic pneumatic brake system accordingly; 13) If the vehicle is in the ignition state and the vehicle speed is zero, the main controller controls the planetary carrier brake to brake, so that the auxiliary air pressure brake system is in the pre-working state and the parking brake is turned off; 14) If the vehicle is in ignition state and the accelerator pedal is depressed, the main controller controls the planetary carrier brake to release, thereby stopping the auxiliary air brake system; 15) If the vehicle is in the ignition state and the vehicle speed is zero signal and the accelerator pedal is pressed signal exist at the same time, the main controller controls the planetary carrier brake to release, so that the auxiliary air pressure brake system stops working; 16) If the vehicle is in the ignition state and the vehicle speed is not zero, the main controller receives the signal from the brake pedal sensor to control the working state of the auxiliary air brake system.

8. The method according to claim 7, characterized in that The main controller in step 12) controls the working state of the electronic pneumatic brake system, specifically including: 121) The main controller receives the signal from the air tank pressure sensor; 122) When the air reservoir pressure is less than threshold 1, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to close, so that the electric air compressor compresses air into the air reservoir; 123) When the air tank pressure is greater than threshold 1 and less than threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to close, so that the electric air compressor stops working; 124) When the air tank pressure is greater than threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to open, so that the electric air compressor stops working.

9. The method according to claim 7, characterized in that The main controller in step 16) controls the working state of the auxiliary air pressure brake system, specifically including: 161) The main controller receives a brake pedal pressure sensor signal; 162) When the brake pedal is pressed, the main controller controls the planetary carrier brake to brake; 163) The main controller receives the signal from the air reservoir pressure sensor. If the pressure value collected by the air reservoir pressure sensor exceeds the threshold value 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to open and release part of the high-pressure gas; 164) If the pressure value collected by the air reservoir pressure sensor is lower than threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to close, so that the auxiliary air compressor compresses air into the air reservoir; 165) When the brake pedal is released, the main controller controls the planetary carrier brake to release.

10. The method according to claim 9, characterized in that The working process of the planetary carrier brake in step 162) specifically includes: 1621) The torque on the drive motor shaft is transmitted through the driving gear on the drive motor shaft, so that the driving gear on the drive motor shaft drives the driven gear on the drive motor shaft to rotate and transmits the torque to the driven gear on the drive motor shaft; 1622) The driven gear on the drive motor shaft drives the sun gear to rotate synchronously and transmits the torque to the sun gear; 1623) The main controller sends a braking command to the planetary carrier brake, the planetary carrier brake is braked, the planetary carrier input speed is zero, and the planetary gear revolution is restricted; 1624) The sun gear drives the planetary gears to rotate and transmits all the torque to the planetary gears; 1625) The rotation of the planetary gear drives the ring gear to rotate and completely transmits the torque to the ring gear; 1626) The ring gear rotates synchronously with the driving pulley and transmits all the torque to the driving pulley; 1627) The driving pulley drives the driven pulley through the belt and transmits the torque to the driven pulley, which in turn drives the auxiliary air compressor to work. The auxiliary air compressor presses the high-pressure air into the air reservoir to ensure that a certain pressure is established in the air reservoir; 1628) The main controller controls the planetary carrier brake of the air pressure auxiliary system clutch device to release, the planetary gear has no input, the torque of the driving gear on the drive motor shaft cannot be transmitted to the ring gear, and the auxiliary air compressor stops working.

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