Electric commercial vehicle multifunctional pneumatic auxiliary braking system and control method

Abstract

The application discloses a kind of electric commercial vehicle multifunctional pneumatic auxiliary brake system and control method, comprising: accelerator pedal, accelerator pedal pressure sensor, speed sensor, brake pedal, brake pedal pressure sensor, electronic pneumatic brake system assembly, pneumatic auxiliary brake system assembly, pneumatic auxiliary brake system clutch device, parking brake and main controller;The application has the function of energy saving, can use the kinetic energy of car when braking through ground friction to drive electric commercial vehicle wheel rotation, then through transmission system to drive motor shaft rotation, then through pneumatic auxiliary system clutch device to drive auxiliary air compressor to work, to supplement the high-pressure gas of air cylinder, can greatly reduce the energy consumption of electric commercial vehicle in long downhill braking or deceleration braking.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile braking systems, and specifically refers to a multifunctional pneumatic auxiliary braking system for electric commercial vehicles and a control method thereof. BACKGROUND

[0002] With the rapid growth of global automobile numbers, the problems of traditional automobiles in energy consumption and safety are becoming increasingly prominent. Especially for heavy commercial vehicles, the safety of high-speed driving and the energy utilization during braking are particularly important. In order to address these problems, the automobile industry is actively exploring methods to improve vehicle operating efficiency and reduce costs.

[0003] For heavy commercial vehicles, the key to ensuring the reliability of their braking is the provision of strong braking force, so almost all heavy commercial vehicles use pneumatic braking systems. In addition, some electrically driven commercial vehicles have introduced regenerative braking energy recovery technology to reduce energy loss and improve the vehicle's range.

[0004] In existing auxiliary braking technologies for commercial vehicles, some innovative technical solutions have been proposed, such as the working method of a truck auxiliary braking system disclosed in Chinese invention patent application No. CN202410270682.1. This method uses a planetary gear mechanism to flexibly change the air pressure of the auxiliary braking air cylinder, thereby ensuring the stability of the braking and can use high-pressure air to cool the brakes, improving the braking effect. However, this technology still relies on internal combustion engines or electric motors to pressurize the air cylinder, which means that the kinetic energy of the vehicle during braking cannot be utilized, but is completely dissipated in the form of heat energy.

[0005] On the other hand, there have also been related technical advances in the field of electric commercial vehicle braking energy recovery systems. For example, a braking energy recovery system for electric commercial vehicles and a control method thereof are disclosed in Chinese invention patent application No. CN201910765142.X. This system obtains real-time information of the vehicle through the vehicle communication network (such as CAN bus) and vehicle sensors, and formulates a reasonable braking strategy based on these information. This method enables electric vehicles to achieve coordinated control of pneumatic braking and electric braking under normal braking conditions, improving the rationality of braking force distribution. However, this technology mainly recovers braking energy through the reverse operation of the drive motor, which results in low recovery efficiency due to the long energy transmission path. In particular, 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 wasted braking energy. SUMMARY

[0006] In view of the above deficiencies of the prior art, the present application aims to improve the energy utilization efficiency of an electric commercial vehicle and enhance the reliability and functionality of its braking system. Specifically, the present application can supplement the high-pressure gas reserves in the gas cylinder during vehicle braking by converting the kinetic energy of the vehicle into high-pressure gas, thereby significantly reducing the energy consumed during long downhill braking or deceleration braking.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0008] The multifunctional gas pressure auxiliary braking system of the electric commercial vehicle of the present application comprises the following parts: a throttle pedal and its connected throttle pedal pressure sensor; a main controller for processing data from the throttle 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; characterized in that it further comprises: an electronic gas pressure braking system assembly, a gas pressure auxiliary braking system assembly, and a clutch device of the gas pressure auxiliary braking system.

[0009] The electronic gas pressure braking system assembly comprises: a gas cylinder with multiple interfaces and an oil and water discharge port; a first one-way valve connected to the gas inlet port one of the gas cylinder; an electric air compressor connected to the first one-way valve through a pipeline; a motor driving the electric air compressor to work; an unloading valve connected to the electric air compressor; a pressure regulator connected to the electric air compressor; a safety valve connected to the gas outlet port three of the gas cylinder; a gas cylinder pressure sensor installed in the pipeline between the gas outlet port four of the gas cylinder and the air inlet port of the brake control valve; a brake control valve gas outlet connected to the brake chamber through a pipeline; a brake chamber pressure sensor installed in the pipeline between the brake control valve gas outlet and the brake chamber; an oil and water discharge valve connected to the oil and water discharge port of the gas cylinder; the oil and water discharge valve is used to release the oil and water in the gas cylinder, keep the pipeline gas dry, and prevent further corrosion of the components.

[0010] The gas pressure auxiliary braking system assembly comprises: a second one-way valve connected to the gas inlet port two of the gas cylinder; 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;

[0011] The clutch device of the gas pressure auxiliary braking system comprises: a driving gear on the driving motor shaft; a driven gear installed on the driving 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 driving motor shaft; a planet gear sleeved on the planet carrier and meshing with the sun gear; a ring gear wrapping the planet gear and meshing with it; a planet carrier controlled by a planet carrier brake, which is sleeved on the sun gear shaft; a driving pulley coaxially connected with the ring gear and connected to the driven pulley through a belt;

[0012] The main controller not only connects the above-mentioned motor, electric air compressor unloading valve, pressure regulator, auxiliary air compressor unloading valve, pressure regulator, air tank pressure sensor, brake chamber pressure sensor, brake control valve, but also receives signals of the air tank pressure sensor, brake 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 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 auxiliary air compressor according to these input signals.

[0013] Further, the air tank pressure sensor is used to monitor the pressure in the air tank, and the pressure has two threshold states, including threshold 1 state and threshold 2 state, and the threshold 1 and threshold 2 states are controlled by the electric air compressor pressure regulator, auxiliary air compressor pressure regulator, electric air compressor unloading valve, auxiliary air compressor unloading valve and safety valve. The pressure in the air pipe is adjusted within the set range. The air pressure is adjusted 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 tank to prevent the equipment from being damaged by excessive pressure.

[0014] Further, the threshold 1 state is defined as the pressure in the air tank that can support the vehicle to complete two consecutive brakes, and the threshold 2 state is defined as the pressure in the air tank that can support the vehicle to complete nine consecutive brakes.

[0015] Further, the air pressure 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, the power is transmitted from the driving motor shaft driving gear to the driving motor shaft driven gear, the driving motor shaft driven gear transmits the power to the sun gear, the sun gear transmits the power to the planetary gear, the planetary gear transmits the power to the ring gear, and the ring gear transmits the power to the driving pulley. The driving pulley transmits the power to the driven pulley through the belt, and the driven pulley drives the auxiliary air compressor to work to compress the gas into the air tank. When the planetary carrier brake is released, the auxiliary air compressor stops working.

[0016] Further, the driving motor shaft is a component part of the vehicle power system, which can transmit torque to the wheels for vehicle driving; the parking brake is a component part of the vehicle braking system, which can realize long-time braking when the vehicle is turned off.

[0017] A multifunctional air pressure auxiliary braking control method for an electric commercial vehicle, comprising the following steps:

[0018] The main controller receives information from the vehicle speed sensor, the reservoir pressure sensor, the accelerator pedal pressure sensor and the brake pedal pressure sensor, and controls the working state of the electronic air brake system and the auxiliary air brake system according to the received information;

[0019] The main controller receives the brake pedal pressure sensor signal and the reservoir pressure sensor signal, and controls the working state of the auxiliary air brake system through the pressure signal transmitted by the reservoir pressure sensor;

[0020] When the brake pedal is depressed, the main controller calculates the theoretical pressure required by the brake chamber according to 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 less 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 greater 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.

[0021] Further, step 1) further comprises:

[0022] 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 brake system is in the pre-working state, and the parking brake is opened;

[0023] 12) If the vehicle is in the ignition state, the main controller receives the reservoir pressure sensor signal, and controls the working state of the electronic air brake system according to the signal;

[0024] 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 brake system is in the pre-working state, and the parking brake is closed;

[0025] 14) If the vehicle is in the ignition state and the accelerator pedal has been depressed, the main controller controls the planetary carrier brake to release, so that the auxiliary air brake system stops working;

[0026] 15) If the vehicle is in the ignition state and the vehicle speed zero signal and the accelerator pedal has been depressed signal exist at the same time, the main controller controls the planetary carrier brake to release, so that the auxiliary air brake system stops working;

[0027] 16) If the vehicle is in the ignition state and the vehicle speed is not zero, the main controller receives the signal of the brake pedal sensor to control the working state of the auxiliary air brake system.

[0028] Further, the main controller controlling the working state of the electronic air brake system in step 12) specifically comprises:

[0029] 121) The main controller receives the pressure sensor signal of the air cylinder;

[0030] 122) When the pressure of the air cylinder is less than threshold 1, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to close, and the electric air compressor compresses air into the air cylinder;

[0031] 123) When the pressure of the air cylinder 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, and the electric air compressor stops working;

[0032] 124) When the pressure of the air cylinder is greater than threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to open, and the electric air compressor stops working. The threshold 1 state is defined as the pressure when the high-pressure gas in the air cylinder can support the vehicle to complete two consecutive braking, and the threshold 2 state is defined as the pressure when the high-pressure gas in the air cylinder can support the vehicle to complete nine consecutive braking.

[0033] Further, the working state of the auxiliary air brake system controlled by the main controller in step 16) specifically includes:

[0034] 161) The main controller receives the brake pedal pressure sensor signal;

[0035] 162) When the brake pedal has been depressed, the main controller controls the planetary carrier brake to brake;

[0036] 163) The main controller receives the pressure sensor signal of the air cylinder, and if the pressure value collected by the air cylinder pressure sensor exceeds threshold 2, the main controller controls the electric air compressor pressure regulator and the auxiliary air compressor pressure regulator to open to release part of the high-pressure gas;

[0037] 164) If the pressure value collected by the air cylinder 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, and the auxiliary air compressor compresses air into the air cylinder;

[0038] 165) When the brake pedal has been released, the main controller controls the planetary carrier brake to release. The threshold 1 state is defined as the pressure when the high-pressure gas in the air cylinder can support the vehicle to complete two consecutive braking, and the threshold 2 state is defined as the pressure when the high-pressure gas in the air cylinder can support the vehicle to complete nine consecutive braking.

[0039] Further, the working process of the planetary carrier brake in step 162) specifically includes:

[0040] 1621) The torque on the drive motor shaft is transmitted through the driving gear on the drive motor shaft, which drives the driven gear on the drive motor shaft to rotate and transmits the torque to the driven gear on the drive motor shaft;

[0041] 1622) The driven gear on the drive motor shaft drives the sun gear to rotate synchronously and transmits the torque to the sun gear;

[0042] 1623) The main controller sends a brake instruction to the planetary carrier brake, and the planetary carrier brake is braked, the input rotation speed of the planetary carrier is zero, and the revolution of the planetary wheel is limited;

[0043] 1624) The sun gear drives the planetary wheel to rotate and transmits the torque to the planetary wheel;

[0044] 1625) The planetary wheel drives the gear ring to rotate and transmits the torque to the gear ring;

[0045] 1626) The gear ring rotates synchronously with the driving pulley and transmits the torque to the driving pulley;

[0046] 1627) The driving pulley drives the driven pulley through the belt and transmits the torque to the driven pulley, thereby driving the auxiliary air compressor to work, and the auxiliary air compressor pressurizes the high-pressure air into the air cylinder to ensure that a certain pressure is established in the air cylinder;

[0047] 1628) The main controller controls the planetary carrier brake of the air pressure auxiliary system clutch device to release, the planetary wheel has no input, the torque of the driving gear on the drive motor shaft cannot be transmitted to the gear ring, and the auxiliary air compressor stops working.

[0048] Technical features and beneficial effects of the present application:

[0049] Technical features:

[0050] Energy recovery function: The present application utilizes the rotation of the wheels driven by the ground friction during vehicle braking, and then drives the motor shaft through the transmission system. On this basis, the auxiliary air compressor is driven to work through the air pressure auxiliary system clutch device, and the kinetic energy of the vehicle is converted into high-pressure gas in the air cylinder. This process effectively recovers the energy originally lost in the form of heat during braking, thereby reducing the energy loss of the electric commercial vehicle during long downhill braking or deceleration braking.

[0051] Auxiliary braking function: The present application also has auxiliary braking capability. In the event of a malfunction of the electric air compressor during vehicle operation, the present application can utilize the vehicle's own kinetic energy for braking. The higher the wheel speed, the faster the high-pressure gas is replenished in the air reservoir, thereby providing the necessary braking force quickly to stop the vehicle in time. This provides additional safety for the vehicle, especially in the event of a failure of the electric air compressor.

[0052] Anti-slip function: In addition, the present application can effectively inhibit the phenomenon of rolling down the hill when the parking brake system of the electric commercial vehicle fails or the driver does not turn off the engine. Utilizing the vehicle's own kinetic energy for braking can significantly reduce the speed of rolling down the hill, giving the driver sufficient time to solve the problem, while reducing the potential danger of rolling down the hill.

[0053] Beneficial effects: Through the above technical means, the present application 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 application can provide reliable auxiliary braking function to ensure the controllability and safety of the vehicle in emergency situations. In addition, by reducing energy loss, the present application also helps to extend the cruising range of the electric commercial vehicle and reduce operating costs. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 The structural principle diagram of the present application system;

[0055] Figure 2 The principle diagram of the air pressure auxiliary system clutch device of the present application;

[0056] Figure 3 The control method flow chart of the present application;

[0057] Figure 1 In the middle: 1-motor, 2-electric air compressor, 3-electric air compressor unloading valve, 4-electric air compressor pressure regulator, 5-first check valve, 6-air reservoir, 7-safety valve, 8-oil and water discharge valve, 9-second check valve, 10-assisted air compressor pressure regulator, 11-assisted air compressor unloading valve, 12-assisted air compressor, 13-driven pulley, 14-air reservoir pressure sensor, 15-brake pedal, 16-brake control valve, 17-brake chamber, 18-brake chamber pressure sensor;

[0058] Figure 2 In the middle: 19-driving pulley, 20-gear ring, 21-planetary gear, 22-planetary carrier, 23-planetary 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

[0059] For the convenience of those skilled in the art to understand, the present application is further described below in conjunction with the embodiments and the accompanying drawings, the content mentioned in the embodiments is not a limitation of the present application.

[0060] Referring to Figure 1 , Figure 2 The electric commercial vehicle multifunctional pneumatic auxiliary braking system of the present application 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 braking system assembly, a pneumatic auxiliary braking system assembly, a pneumatic auxiliary braking system clutch device, a parking brake and a main controller; wherein,

[0061] The accelerator pedal is connected to the accelerator pedal pressure sensor;

[0062] The accelerator pedal pressure sensor is connected to the main controller;

[0063] The vehicle speed sensor is connected to the main controller;

[0064] The brake pedal 15 is connected to the brake pedal pressure sensor;

[0065] The brake pedal pressure sensor is connected to the main controller;

[0066] The electronic pneumatic braking system assembly comprises: 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 check valve 5, an oil and water discharge valve 8, an air reservoir pressure sensor 14, a brake control valve 16, a brake chamber 17 and a brake chamber pressure sensor 18;

[0067] The air reservoir 6 has two air inlets, i.e., air inlet one and air inlet two, four air outlets, i.e., air outlet one, air outlet two, air outlet three and air outlet four, and an oil and water discharge outlet;

[0068] The air inlet one of the air reservoir 6 is connected to the first check valve 5, the first check 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 is driven by the motor 1 to compress 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 one of the air reservoir 6 through an air pipe;

[0069] The outlet three of the gas cylinder 6 is connected with the safety valve 7, the outlet four of the gas cylinder 6 is connected with the inlet of the brake control valve 16 through the air pipe, the gas cylinder pressure sensor 14 is installed between the outlet four and the air pipe of the inlet of the brake control valve 16, the outlet of the brake control valve 16 is connected with the brake chamber 17 through the air pipe, the brake chamber pressure sensor 18 is installed between the outlet four of the brake control valve 16 and the air pipe of the brake chamber 17, and the oil and water outlet of the gas cylinder 6 is connected with the oil and water outlet valve 8.

[0070] The pneumatic auxiliary brake system assembly comprises 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.

[0071] The inlet two of the gas cylinder 6 is connected with the second one-way valve 9, the second one-way valve 9 is connected with the auxiliary air compressor 12 through the air pipe, the auxiliary air compressor 12 is connected with the driven pulley 13 and driven by the rotating driven pulley 13 to compress air, the auxiliary air compressor unloading valve 11 of the auxiliary air compressor 12 is connected with the auxiliary air compressor pressure regulator 10 through the air pipe, and the auxiliary air compressor pressure regulator 10 is connected with the outlet two of the gas cylinder 6 through the air pipe.

[0072] The pneumatic auxiliary system clutch device comprises 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 planet carrier 22, a planet carrier brake 23 and a driving pulley 19; the planet carrier brake 23 is connected with and controlled by the main controller; the driving motor shaft driving gear 27 is installed on the driving motor shaft 26 through the spline and engaged with the driving motor shaft driven gear 24; the driving motor shaft driven gear 24 is installed on the sun gear shaft 25 through the spline; the sun gear 28 is installed on the sun gear shaft 25 through the spline; the planetary gear 21 is sleeved on the planet carrier 22 and engaged with the sun gear 28; the gear ring 20 is engaged with the planetary gear 21; the gear ring 20 wraps the planetary gear 21, the planetary gear 21 surrounds the sun gear 28, the rotation axis of the sun gear 28 is collinear with the rotation axis of the gear ring 20, the planet carrier 22 is sleeved on the sun gear shaft 25 and controlled by the planet carrier brake 23; the driving pulley 19 is coaxially connected with the gear ring 20; the driving pulley 19 is connected with the driven pulley 13 through the belt.

[0073] The first one-way valve 5 and the second one-way valve 9 can only make the high-pressure gas flow from the air pipe to the gas cylinder 6;

[0074] The electric air compressor unloading valve 3 and the auxiliary air compressor unloading valve 11 are used for adjusting the air pressure to prevent the air pressure from being too high to protect the equipment.

[0075] The electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 are used for adjusting the pressure in the air pipe within the set range.

[0076] Safety valve 7 is used to limit the pressure in the gas bucket, to prevent the pressure from being too high to damage the equipment.

[0077] Oil and water release valve 8 is used to release the oil and water in the air cylinder 6, to keep the pipeline gas dry, to prevent further corrosion of the components.

[0078] Brake control valve 16 has an air inlet and several air outlets, which are connected with brake pedal 15 and controlled by brake pedal 15, the number of air outlets depends on the number of brake chamber 17;

[0079] When the brake pedal 15 is pressed down, the brake control valve 16 opens, the high pressure gas in the air cylinder 6 enters the brake chamber 17, thereby applying brake force to the wheels to brake the vehicle to slow down, when the brake pedal 15 is released, the brake control valve 16 is closed, the high pressure gas in the brake chamber 17 is released, and the wheels have no brake force.

[0080] The main controller is electrically connected with 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 cylinder pressure sensor 14, the brake chamber pressure sensor 18 and the brake control valve 16 through the connecting lines; the main controller receives the signals of the air cylinder pressure sensor 14, the brake chamber pressure sensor 18, the vehicle speed sensor, the brake pedal pressure sensor and the throttle pedal pressure sensor, controls the motor 1 speed, the electric air compressor unloading valve 3, the auxiliary air compressor unloading valve 11, the brake control valve 16 opening and closing state and the working state of the planetary carrier brake 23, adjusts the threshold range of the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10.

[0081] The air cylinder pressure sensor 14 is used to monitor the pressure in the air cylinder 6, and there are two threshold states, including threshold 1 state and threshold 2 state, and 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.

[0082] The threshold 1 state is defined as the pressure of the high pressure gas in the air cylinder 6 that can support the vehicle to complete two consecutive braking, and the threshold 2 state is defined as the pressure of the high pressure gas in the air cylinder 6 that can support the vehicle to complete nine consecutive braking.

[0083] The air pressure auxiliary system clutch device controls the input of the planet carrier 22 through the planet carrier brake 23, thereby changing the transmission of power, when the planet carrier brake 23 is braked, the input rotation speed of the planet carrier 22 is zero, the power is transmitted from the driving motor shaft driving gear 27 to the driving motor shaft driven gear 24, the driving motor shaft driven gear 24 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, and the driven pulley 13 drives the auxiliary air compressor 12 to work to compress the gas into the air cylinder 6, when the planet carrier brake 23 is released, the auxiliary air compressor 12 stops working.

[0084] The driving motor shaft 26 is a component part of the vehicle power system, and can transmit torque to the wheels for driving the vehicle.

[0085] The parking brake is a component part of the vehicle braking system, and can realize long-time braking when the vehicle is turned off.

[0086] The electric commercial vehicle multifunctional air pressure auxiliary braking control method of the application is based on the above-mentioned system, and comprises the following steps:

[0087] 1) The main controller receives the information collected by the vehicle speed sensor, the air cylinder pressure sensor 14 signal, the accelerator pedal pressure sensor and the brake pedal pressure sensor, and controls the working state of the electronic air pressure braking system and the auxiliary air pressure braking system according to the received information;

[0088] 2) The main controller receives the brake pedal pressure sensor signal and the air cylinder pressure sensor 14 signal, and controls the working state of the auxiliary air pressure braking system through the pressure signal transmitted by the air cylinder pressure sensor 14;

[0089] 3) When the brake pedal 15 is stepped on, the main controller calculates the required theoretical pressure of the brake chamber 17 according to the pressure of the brake pedal 15, the main controller receives the pressure information collected by the brake chamber pressure sensor 18 and judges, when the pressure in the brake chamber 17 is less than the theoretical pressure, the main controller controls the brake control valve 16 to increase the pressure, and supplements the pressure in the brake chamber 17; when the pressure in the brake chamber 17 is greater than the theoretical pressure, the main controller controls the brake control valve 16 to reduce the pressure, so that the pressure in the brake chamber 17 is kept at the theoretical pressure value.

[0090] The main controller in step 1) controls the electronic air pressure braking system and the auxiliary air pressure braking system to work, which specifically comprises the following steps:

[0091] 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, so as to control the auxiliary air brake system to be in the pre-working state, and the parking brake is opened;

[0092] 12) When the vehicle is in the ignition state, the main controller receives the pressure sensor signal 18 of the air reservoir, and controls the working state of the electronic air brake system.

[0093] 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, so as to control the auxiliary air brake system to be in the pre-working state, and the parking brake is closed;

[0094] 14) When the vehicle is in the ignition state, the main controller receives the signal that the accelerator pedal has been stepped down sent by the accelerator pedal sensor, and the main controller controls the planetary carrier brake 23 to release, so as to control the auxiliary air brake system to stop working;

[0095] 15) When the vehicle is in the ignition state and the vehicle speed is zero signal and the accelerator pedal has been stepped down signal exist at the same time, the main controller controls the planetary carrier brake 23 to release, so as to control the auxiliary air brake system to stop working;

[0096] 16) When the vehicle is in the ignition state and the vehicle speed is not zero, the main controller receives the signal of the brake pedal sensor to control the working state of the auxiliary air brake system.

[0097] The main controller controlling the working state of the electronic air brake system in step 12 specifically includes the following steps:

[0098] 121) The main controller receives the pressure sensor signal 14 of the air reservoir 6;

[0099] 122) When the pressure of the air reservoir 6 is less than threshold 1, the main controller controls the electric air compressor regulator 4 and the auxiliary air compressor regulator 10 to be closed, and the electric air compressor 2 compresses air into the air reservoir 6;

[0100] 123) When the pressure of the air reservoir 6 is greater than threshold 1 and less than threshold 2, the main controller controls the electric air compressor regulator 4 and the auxiliary air compressor regulator 10 to be closed, and the electric air compressor 2 stops working;

[0101] 124) When the pressure of the air reservoir 6 is greater than threshold 2, the main controller controls the electric air compressor regulator 4 and the auxiliary air compressor regulator 10 to be opened, and the electric air compressor 2 stops working.

[0102] The main controller controlling the working state of the auxiliary air brake system in step 16 specifically includes the following steps:

[0103] 161) The main controller receives the brake pedal pressure sensor signal;

[0104] 162) When the brake pedal 15 has been pressed, the main controller controls the planetary carrier brake 23 to brake;

[0105] 163) The main controller receives the air reservoir pressure sensor 14 signal, and the pressure value collected by the air reservoir pressure sensor 14 exceeds threshold 2. The main controller controls the electric air compressor pressure regulator 4 and the auxiliary air compressor pressure regulator 10 to open, releasing part of the high-pressure gas;

[0106] 164) The pressure value collected by the air reservoir pressure sensor 14 is lower than 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 auxiliary air compressor 12 compresses air into the air reservoir 6;

[0107] 165) When the brake pedal 15 has been released, the main controller controls the planetary carrier brake 23 to release.

[0108] The working process of the planetary carrier brake 23 in step 162) specifically includes the following steps:

[0109] 1621) The torque on the drive motor shaft 26 is transmitted downward through the drive motor shaft main drive gear 27, which drives the drive motor shaft driven gear 24 to rotate and transmits the torque to the drive motor shaft driven gear 24;

[0110] 1622) The drive motor shaft driven gear 24 drives the sun gear 28 to rotate synchronously and transmits the torque to the sun gear 28;

[0111] 1623) The main controller sends a brake instruction to the planetary carrier brake 23, and the planetary carrier brake 23 brakes, the input rotational speed of the planetary carrier 22 is zero, and the revolution of the planetary gear 21 is limited;

[0112] 1624) The sun gear 28 drives the planetary gear 21 to rotate and transmits the torque to the planetary gear 21;

[0113] 1625) The planetary gear 21 drives the ring gear 20 to rotate and transmits the torque to the ring gear 20;

[0114] 1626) The ring gear 20 rotates synchronously with the drive pulley 19 and transmits the torque to the drive pulley 19;

[0115] 1627) The drive 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, and the auxiliary air compressor 12 pressurizes the high-pressure air into the air reservoir 6, ensuring that a certain pressure is established in the air reservoir 6;

[0116] 1628)The main controller controls the brake 23 of the planetary carrier of the air pressure auxiliary system to release, the planetary gear 21 has no input, the torque of the driving motor shaft driving gear 27 cannot be transmitted to the gear ring 20, and the auxiliary air compressor 12 stops working.

[0117] The application has many specific application approaches, and the above is only the preferred embodiment of the application. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements can be made without departing from the principle of the application, and these improvements should also be considered as the protection scope of the application.

Claims

1. An electrically powered commercial vehicle multi-functional pneumatic auxiliary braking system comprising the following parts: an accelerator pedal and its connected accelerator pedal pressure sensor; A main controller for processing data from the throttle 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; characterized in that: further comprising: 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 comprises: an air reservoir with multiple interfaces and an oil and water discharge port; a first one-way valve connected to the air inlet port one 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 to work; an 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 three of the air reservoir; an air reservoir pressure sensor installed in the pipeline between the air outlet port four of the air reservoir and the air inlet port of the brake control valve; the air outlet port of the brake control valve is connected to the brake chamber through a pipeline; a brake chamber pressure sensor is installed in the pipeline between the air outlet port of the brake control valve and the brake chamber; an oil and water discharge valve connected to the oil and water discharge port of the air reservoir; The pneumatic auxiliary brake system assembly comprises: a second one-way valve connected to the air inlet port two 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 pneumatic auxiliary brake system comprises: a driving gear on the driving motor shaft; a driven gear installed above the driving 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 driving motor shaft; a planet gear sleeved on the planet carrier and meshing with the sun gear; a ring gear sleeved on the planet gear and meshing with it; a planet carrier controlled by a planet carrier brake, sleeved on the sun gear shaft; a driving pulley coaxially connected with the ring gear and connected with a driven pulley through a belt; The main controller not only connects the above-mentioned motor, electric air compressor unloading valve, pressure regulator, auxiliary air compressor unloading valve, pressure regulator, air reservoir pressure sensor, brake chamber pressure sensor, brake control valve, but also receives signals from the air reservoir pressure sensor, brake chamber pressure sensor, vehicle speed sensor, brake pedal pressure sensor and throttle 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 planet carrier brake according to these input signals, and adjusts the pressure regulator of the electric air compressor and the auxiliary air compressor at the same time.

2. The system of claim 1, wherein, The air reservoir pressure sensor is used to monitor the pressure in the air reservoir, and the pressure has two threshold states, including threshold 1 state and threshold 2 state, and the 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 of claim 2, wherein, The threshold 1 state is defined as the pressure in the high-pressure gas cylinder that can support the vehicle to complete two consecutive braking, and the threshold 2 state is defined as the pressure in the high-pressure gas cylinder that can support the vehicle to complete nine consecutive braking.

4. The system of claim 1, wherein, The air pressure auxiliary system clutch device controls the input of the planet carrier through the planet carrier brake, thereby changing the transmission of power, when the planet carrier brake is braked, the planet carrier input rotation speed is zero, the power is transmitted from the driving motor shaft driving gear to the driving motor shaft driven gear, the driving motor shaft driven gear transmits power to the sun gear, the sun gear transmits power to the planetary gear, the planetary gear transmits power to the ring gear, the ring gear transmits power to the driving pulley, the driving pulley transmits power to the driven pulley through the belt, and the driven pulley drives the auxiliary air compressor to work to compress the gas into the gas cylinder, when the planet carrier brake is released, the auxiliary air compressor stops working.

5. The system of claim 1, wherein, The driving motor shaft is a component part of the vehicle power system, which can transmit torque to the wheels for vehicle driving; the parking brake is a component part of the vehicle braking system, which can realize long-time braking when the vehicle is turned off.

6. An electric commercial vehicle multi-functional pneumatic auxiliary brake control method, characterized by, The system based on claim 3 comprises the following steps: Step 1) The main controller receives information from the vehicle speed sensor, the gas cylinder pressure sensor, the accelerator pedal pressure sensor and the brake pedal pressure sensor, and controls the working state of the electronic air pressure braking system and the auxiliary air pressure braking system according to the received information; Step 2) The main controller receives the brake pedal pressure sensor signal and the gas cylinder pressure sensor signal, and controls the working state of the auxiliary air pressure braking system through the pressure signal transmitted by the gas cylinder pressure sensor; Step 3) When the brake pedal is stepped on, the main controller calculates the theoretical pressure required by the brake chamber according to 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 less 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 greater 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 of claim 6, wherein, Step 1) further comprises: 11) After receiving the vehicle ignition signal, if the vehicle is in the off state, the main controller controls the planet carrier brake to brake for a long time, so that the auxiliary air pressure braking system is in the pre-working state, and the parking brake is opened; 12) If the vehicle is in the ignition state, the main controller receives the gas cylinder pressure sensor signal, and controls the working state of the electronic air pressure braking system according to the signal; 13) If the vehicle is in the ignition state and the vehicle speed is zero, the main controller controls the planet carrier brake to brake, so that the auxiliary air pressure braking system is in the pre-working state, and the parking brake is closed; 14) If the vehicle is in the ignition state and the accelerator pedal has been stepped on, the main controller controls the planet carrier brake to release, so that the auxiliary air pressure braking system stops working; 15) If the vehicle is in the ignition state and the vehicle speed zero signal and the accelerator pedal stepped on signal exist at the same time, the main controller controls the planet carrier brake to release, so that the auxiliary air pressure braking 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 of the brake pedal sensor to control the working state of the auxiliary air brake system.

8. The method of claim 7, wherein, The main controller in step 12) controlling the working state of the electronic air brake system specifically includes: 121) The main controller receives the signal of the air reservoir pressure sensor; 122) When the air reservoir pressure is less than threshold 1, the main controller controls the electric air compressor governor and the auxiliary air compressor governor to be closed, so that the electric air compressor compresses air into the air reservoir; 123) When the air reservoir pressure is greater than threshold 1 and less than threshold 2, the main controller controls the electric air compressor governor and the auxiliary air compressor governor to be closed, 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 governor and the auxiliary air compressor governor to be opened, so that the electric air compressor stops working.

9. The method of claim 7, wherein, The main controller in step 16) controlling the working state of the auxiliary air brake system specifically includes: 161) The main controller receives the signal of the brake pedal pressure sensor; 162) When the brake pedal has been pressed, the main controller controls the planetary carrier brake to brake; 163) The main controller receives the signal of the air reservoir pressure sensor, if the pressure value collected by the air reservoir pressure sensor exceeds threshold 2, the main controller controls the electric air compressor governor and the auxiliary air compressor governor to be opened, to 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 governor and the auxiliary air compressor governor to be closed, so that the auxiliary air compressor compresses air into the air reservoir; 165) When the brake pedal has been released, the main controller controls the planetary carrier brake to release.

10. The method of claim 9, wherein, 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 brake instruction to the planetary carrier brake, the planetary carrier brake brakes, the planetary carrier input rotation speed is zero, and the planetary wheel revolution is restricted; 1624) The sun gear drives the planetary wheel to rotate, and transmits the torque to the planetary wheel; 1625) The planetary wheel rotates to drive the gear ring to rotate, and transmits the torque to the gear ring; 1626) The gear ring rotates synchronously with the driving pulley, and transmits 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, and then drives the auxiliary air compressor to work, the auxiliary air compressor pressurizes 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 brake of the carrier of the air pressure auxiliary system clutch to release, the planet wheel has no input, the torque of the driving gear on the motor shaft cannot be transmitted to the gear ring, and the auxiliary air compressor stops working.

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