Chassis, power assembly, chassis control method and electric vehicle

Abstract

The invention provides a chassis, a power assembly, a chassis control method and an electric vehicle. According to the chassis provided by the invention, the first EPB control unit and the second EPB control unit are adopted to form dual-control braking, so that the problem that a new energy vehicle has no P-gear lock configuration can be solved, and under the condition that electronic control of an electronic parking system fails, the electric vehicle still has a parking backup function, and the requirement of 8% of uphill and downhill parking of national standard regulations is met. According to the chassis and the steering column matched with the electric power steering (EPS) and the self-response crumple protection function, operation is convenient, automatic returning can be achieved, stable linear driving is guaranteed, the self-control cooling system is matched, the arrangement space of the whole vehicle is increased, the self-control cooling system is in the optimal working state according to the motor temperature and the cooling liquid temperature, and the energy consumption of the whole vehicle is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle components, and in particular to a chassis, a powertrain, a method for controlling the chassis, and an electric vehicle. Background Art

[0002] With the production of pure electric new energy light commercial vehicles, the demand for high performance, intelligence and integration of electric vehicles has become increasingly strong. Most pure electric new energy light commercial vehicles are still converted from oil to electricity, that is, based on traditional fuel vehicles, they are converted to pure electric drive models, which cannot meet the high performance, intelligence and integration of electric vehicles. Commercial vehicle chassis requirements.

[0003] Most oil-to-electric light commercial vehicles use electro-hydraulic steering systems, electro-hydraulic brake systems, drive shaft motors and rear axle separate drives or motors installed in parallel on rear axle parallel axle electric drives, and upright cooling systems. Match the P-gear parking drive mechanism to meet the requirements of GB21670 regulations: match the parking brake system of the electronic control transmission, when the internal electronic control transmission, the external circuit of the electronic control unit except the power supply circuit is damaged or the control device fails, the parking brake function must be activated from the driving position and the fully loaded electric vehicle must remain stationary on an 8% slope.

[0004] The oil-to-electric commercial vehicle chassis that are widely developed at this stage have low vehicle transmission efficiency, generally only <90%, long braking distance, only meeting the national standard of <19m, long hydraulic braking response time, and cannot match advanced auxiliary functions such as ADAS. Summary of the invention

[0005] In view of this, the present application provides a chassis, a powertrain, a chassis control method and an electric vehicle, the purpose of which is to solve the above technical problems to a certain extent.

[0006] In a first aspect, the present application provides a chassis, the chassis comprising:

[0007] EHB controller, ESC controller, VCU controller, gear controller, left rear electronic caliper brake, right rear electronic caliper brake, eight-pin relay, wheel speed sensor, EPB switch, static signal source, EPS electric power steering, self-response crumple protection function steering column and coaxial electric drive rear axle;

[0008] Wherein, the chassis comprises a left rear wheel and a right rear wheel, the left rear wheel is provided with an electronic caliper brake for braking the left rear wheel, and the right rear wheel is provided with an electronic caliper brake for braking the right rear wheel;

[0009] Wherein, the eight-pin relay includes a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin;

[0010] The EHB controller is connected to the fourth and sixth pins of the eight-pin relay through communication, the ESC controller is connected to the left rear electronic caliper brake, the third pin of the eight-pin relay, the fifth pin of the eight-pin relay, the wheel speed sensor and the EPB switch through communication, the VCU controller is connected to the seventh pin of the eight-pin relay through communication, and the right rear electronic caliper brake is connected to the third and fifth pins of the eight-pin relay through communication;

[0011] Wherein, the EHB controller, the ESC controller, the VCU controller and the gear controller are connected to each other in pairs;

[0012] Wherein, the VCU controller is communicatively connected with the static signal source;

[0013] Wherein, the EHB controller and the ESC controller are respectively integrated with a first EPB control unit and a second EPB control unit;

[0014] Wherein, the EPS electric power steering gear is connected to the self-response crumple protection function steering column;

[0015] Among them, the EPS electric power steering device, the self-responsive crumple protection function steering column and the coaxial electric drive rear axle are communicatively connected in pairs.

[0016] Preferably, the chassis further comprises a radiator assembly and an electronic water pump, and the radiator assembly is connected to the electronic water pump via a water pipe;

[0017] The EPS electric power steering, the self-response crumple protection function steering column, the coaxial electric drive rear axle, and the electronic water pump are communicatively connected in pairs.

[0018] Preferably, the powertrain comprises a chassis as described above.

[0019] In a second aspect, the present application provides a chassis control method, the chassis control method is applied to the chassis as described above, the control method comprising:

[0020] Under normal circumstances, the EPS electric power steering device operates the self-responsive crumple protection function steering column. The self-responsive crumple protection function steering column is provided with an angle sensor. The angle sensor converts the rotation signal of the self-responsive crumple protection function steering column and transmits it to the EPS electric power steering device. The EPS electric power steering device has a torque sensor and a speed sensor. The VCU controller receives the angle sensor, torque sensor and speed sensor signals to make judgments and feed back electrical signals to the EPS electric power steering device. The EPS electric power steering device provides steering assistance after receiving the electrical signals.

[0021] Preferably, the chassis further comprises a radiator assembly and an electronic water pump, wherein the radiator assembly is connected to the electronic water pump via a water pipe; the EPS electric power steering, the self-response crumple protection function steering column, the coaxial electric drive rear axle, and the electronic water pump are connected in communication with each other; the control method further comprises:

[0022] In normal vehicle operation, when the motor temperature of the coaxial electric drive rear axle is greater than 60°C or less than 15°C, the temperature signal of the motor of the coaxial electric drive rear axle is transmitted to the VCU vehicle controller. After determination by the VCU vehicle controller, the electronic water pump is started to pressurize the coolant to the radiator assembly, which is then transported to the coaxial electric drive rear axle after cooling or heating.

[0023] Preferably, the control method further includes:

[0024] When the EPS electric power steering device is deformed and / or damaged by impact, the EPS electric power steering device transmits a signal to the self-response crush protection function steering column to activate the self-response crush protection function.

[0025] Preferably, the control method further includes:

[0026] The EPB switch is operated, and the ESC controller converts the received switch signal into an electrical signal and transmits it to the second EPB control unit. The second EPB control unit converts the parking demand into current control of the left rear electronic caliper brake and / or the right rear electronic caliper brake.

[0027] Preferably, the control method further includes:

[0028] In the event that the second EPB control unit fails, in response to the driver shifting the gear to P gear, the first EPB control unit enters the failed parking backup mode to further receive the "failed parking backup pull-up and release" command issued by the VCU controller, thereby realizing the parking pull-up and release action of the right rear electronic caliper.

[0029] In a third aspect, the present application provides an electric vehicle, which includes the chassis as described above, or includes the powertrain as described above.

[0030] In a fourth aspect, the present application provides an electric vehicle, which uses the chassis control method as described above.

[0031] According to the chassis provided by the present application, the first EPB control unit and the second EPB control unit are used to form a dual-control brake, which can solve the problem of new energy vehicles without P gear lock configuration. In the case of electronic parking system electronic control failure, the electric vehicle still has a parking backup function, meeting the national standard regulations 8% uphill and downhill parking requirements. The first EPB control unit and the second EPB control unit are integrated into other parts controllers, and the backup first EPB control unit and the second EPB control unit can use self-integrated, general PBC units, without the need for a separate dual-control parking controller, which reduces the complexity of the chassis, saves development costs and single vehicle parts costs, and can improve product competitiveness.

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of a chassis structure provided according to an embodiment of the present application is shown;

[0035] Figure 2 A schematic diagram showing circuit connections of a chassis provided according to an embodiment of the present application is shown;

[0036] Figure 3 A schematic diagram showing an EHB_PBC1 failure parking backup workflow diagram of a chassis control method provided in an embodiment of the present application is shown;

[0037] Figure 4 A schematic diagram showing a workflow diagram of a VCU issuing a failed parking backup instruction according to a chassis control method provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram showing a workflow diagram of a VCU issuing an electronic water pump start / stop instruction according to a chassis control method provided in an embodiment of the present application;

[0039] Figure 6 A schematic diagram of a workflow diagram of a VCU issuing EPS power steering assistance instructions according to a chassis control method provided in an embodiment of the present application is shown.

[0040] 1-EHB controller; 2-ESC controller; 3-VCU controller; 4-gear controller; 5-left rear electronic caliper brake; 6-right rear electronic caliper brake; 7-eight-pin relay; 8-wheel speed sensor; 9-EPB switch; 10-static signal source; 101-first EPB control unit; 201-second EPB control unit; 501-left rear electronic caliper; 601-right rear electronic caliper; 11-EPS electric power steering; 12-self-response crumple protection function steering column; 13-coaxial electric drive rear axle; 14-radiator assembly; 15-electronic water pump. DETAILED DESCRIPTION

[0041] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0045] According to a first aspect of an embodiment of the present application, a chassis is provided. Figures 1 to 6 Describe the structure and working principle of the chassis in detail. Figure 1 In the example, due to the occlusion of the left rear wheel, Figure 1 The left rear electronic caliper brake 5 and the wheel speed sensor 8 are not directly shown in the figure, but the positions of the left rear electronic caliper brake 5 and the wheel speed sensor 8 are pointed out through leads and marks.

[0046] In the embodiment, the chassis includes: an EHB (Electric Hydraulic Brake) controller, an ESC (Electronic Stability Controller) controller, a VCU (Vehicle Control Unit) controller, a gear controller 4, a left rear electronic caliper brake 5, a right rear electronic caliper brake 6, an eight-pin relay 7, a wheel speed sensor 8, an EPB (Electrical Parking Brake) switch, a static signal source 10, an EPS (Electrical Power Steering) electric power steering, a self-response crumple protection function steering column 12 and a coaxial electric drive rear axle 13.

[0047] In the embodiment, the chassis includes a left rear wheel and a right rear wheel, the left rear wheel is provided with an electronic caliper brake 5 for braking the left rear wheel, and the right rear wheel is provided with an electronic caliper brake 6 for braking the right rear wheel. In essence, the chassis also includes a left front wheel and a right front wheel, that is, the chassis is provided with four wheels in total.

[0048] In the embodiment, the eight-pin relay 7 includes a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin.

[0049] In an embodiment, the EHB controller 1 is communicatively connected to the fourth and sixth pins of the eight-pin relay 7, the ESC controller 2 is communicatively connected to the left rear belt electronic caliper brake 5, the third pin of the eight-pin relay 7, the fifth pin of the eight-pin relay 7, the wheel speed sensor 8 and the EPB switch 9, the VCU controller 3 is communicatively connected to the seventh pin of the eight-pin relay 7 (for example, through a hard-wired connection of a wiring harness), and the right rear belt electronic caliper brake 6 is communicatively connected to the third and fifth pins of the eight-pin relay 7 (for example, through a hard-wired connection of a wiring harness).

[0050] In the embodiment, the EHB controller 1, the ESC controller 2, the VCU controller 3 and the gear controller 4 are connected to each other in pairs. Specifically, the EHB controller 1, the ESC controller 2, the VCU controller 3 and the gear controller 4 can all be connected to the CAN line, so that information exchange can be realized on the CAN (Controller Area Networks) network.

[0051] In an embodiment, the VCU controller 3 is communicatively connected with the static signal source 10. Specifically, the VCU controller 3 and the static signal source 10 may be connected via a wiring harness hard line or a CAN line.

[0052] In the embodiment, the first EPB control unit 101 and the second EPB control unit 201 are respectively integrated in the EHB controller 1 and the ESC controller 2. Here, the first EPB control unit 101 and the second EPB control unit 201 can be represented as EHB_PBC1 and ESC_PBC2.

[0053] In the embodiment, the EPS electric power steering 11 is connected to a self-responsive crush protection function steering column 12 .

[0054] In an embodiment, the EPS electric power steering 11, the self-response crumple protection function steering column 12 and the coaxial electric drive rear axle 13 are connected in communication with each other in pairs, for example, the three are connected to the CAN line through a wiring harness, so as to realize information exchange on the CAN network.

[0055] In this way, according to the chassis provided by the embodiment of the present application, the first EPB control unit 101 and the second EPB control unit 201 are used to form a dual-control brake, so as to solve the problem that the new energy vehicle has no P gear lock configuration. In the case of electronic parking system electronic control failure, the electric vehicle still has a parking backup function, which meets the national standard regulations of 8% uphill and downhill parking requirements. The first EPB control unit 101 and the second EPB control unit 201 are integrated into other parts controllers, and the backup first EPB control unit 101 and the second EPB control unit 201 can use a self-integrated, general PBC (parking brake controller) unit, without the need for a separate dual-control parking controller, which reduces the complexity of the chassis, saves development costs and single vehicle parts costs, and can improve product competitiveness.

[0056] According to the chassis provided in the embodiment of the present application, the chassis also includes a radiator assembly 14 and an electronic water pump 15, and the radiator assembly 14 is connected to the electronic water pump 15 through a water pipe. The EPS electric power steering 11, the self-response crumple protection function steering column 12, the coaxial electric drive rear axle 13, and the electronic water pump 15 are connected in pairs. For example, the four are connected to the CAN line through a wiring harness to achieve information exchange on the CAN network. In this way, it is beneficial to automatically control the cooling system to the optimal working state according to the motor temperature and coolant temperature of the coaxial electric drive rear axle 13, thereby reducing the energy consumption of the whole vehicle.

[0057] The embodiment of the present application is equipped with an electric power steering EPS and a steering column with a self-response crumple protection function. It is easy to operate and can automatically return to the center position to ensure stable straight-line driving. It takes into account both high-speed driving handling stability and low-speed steering speed. The impact of the ground on the wheels is transmitted to the steering wheel with a recoil as small as possible to reduce driver fatigue. The steering column with a self-response crumple function is matched to improve the crumple response speed and reduce human injuries after an electric vehicle collision. The coaxial electric drive rear axle 13 is matched, equipped with a low-power and high-torque motor, which simultaneously improves the transmission efficiency of the vehicle system. The first domestic light commercial vehicle is equipped with an inclined automatic cooling system, which improves the layout space of the vehicle. According to the motor temperature and coolant temperature, the cooling system is automatically controlled to the optimal working state to reduce the energy consumption of the vehicle.

[0058] According to a second aspect of an embodiment of the present application, a powertrain is provided, which includes the above chassis and the above beneficial effects, which will not be described in detail here.

[0059] According to a third aspect of an embodiment of the present application, a method for controlling a chassis is provided. The method for controlling a chassis is applied to the above chassis. The method for controlling a chassis includes:

[0060] Under normal circumstances, the EPS electric power steering 11 operates the self-responsive crumple protection function steering column 12. The self-responsive crumple protection function steering column 12 is provided with an angle sensor, and the angle sensor converts the rotation signal of the self-responsive crumple protection function steering column 12 and transmits it to the EPS electric power steering 11. The EPS electric power steering 11 has a torque sensor and a speed sensor (for example, the angle sensor converts the torsional motion of the steering column into an electrical signal, and transmits the electrical signal to the CAN bus, and then transmits it to the EPS electric power steering 11. The torque sensor and speed sensor of the EPS electric power steering 11 are converted into electrical signals and then transmitted to the CAN bus).

[0061] In an embodiment, the VCU controller (for example, from a CAN bus) receives signals from an angle sensor, a torque sensor, and a speed sensor to make judgments and feed back electrical signals to the EPS electric power steering device 11. The EPS electric power steering device 11 provides steering assistance after receiving the electrical signals. For example, the motor of the EPS electric power steering device 11 provides steering assistance according to a calibration procedure after receiving the signals.

[0062] According to the control method of the chassis provided in the embodiment of the present application, the chassis also includes a radiator assembly 14 and an electronic water pump 15, and the radiator assembly 14 is connected to the electronic water pump 15 through a water pipe; the EPS electric power steering device 11, the self-response crumple protection function steering column 12, the coaxial electric drive rear axle 13, and the electronic water pump 15 are connected in communication with each other; the control method also includes:

[0063] When the vehicle is in normal operation, when the motor temperature of the coaxial electric drive rear axle 13 is greater than 60°C or less than 15°C, the temperature signal of the motor of the coaxial electric drive rear axle 13 (for example, through the temperature sensor of the coaxial electric drive rear axle 13) is transmitted to the VCU vehicle controller. After determination by the VCU vehicle controller, the electronic water pump 15 is started to pressurize the coolant to the radiator assembly 14, which is then transported to the coaxial electric drive rear axle 13 after cooling (cooling when greater than 60°C) or heating (heating when less than 15°C), thereby starting the cooling or heating function.

[0064] According to the control method of the chassis provided in the embodiment of the present application, the control method may further include:

[0065] When the EPS electric power steering 11 is deformed and / or damaged by impact, the EPS electric power steering 11 transmits a signal to the self-responsive crumple protection function steering column 12 (for example, the sensor in the EPS electric power steering 11 transmits a signal to the CAN bus, which is then processed and transferred to the self-responsive crumple protection function steering column 12) to activate the self-responsive crumple protection function.

[0066] According to the control method of the chassis provided in the embodiment of the present application, the control method may further include:

[0067] In the dual control braking system, under normal circumstances of ESC_PBC2, the driver operates the EPB switch 9, and the ESC controller 2 converts the received switch signal into an electrical signal and transmits it to the second EPB control unit 201. After synchronously interpreting the relevant signals, the second EPB control unit 201 converts the parking demand into current control of the left rear electronic caliper 501 brake and / or the right rear electronic caliper 601 brake, thereby realizing the parking pull-up and release actions.

[0068] Specifically, the current control path of the left rear electronic caliper 501: the current output by ESC_PBC2 is directly connected to the left rear electronic caliper 501 via the wiring harness hard wire to achieve control; the current control path of the right rear electronic caliper 601: the current output by ESC_PBC2 is connected to the left rear electronic caliper 501 via the wiring harness hard wire through the third and fifth pins of the normally closed contact of the eight-pin relay 7 and the first and second pins of the static contact to reach the right rear electronic caliper 601 to achieve control.

[0069] Status of eight-pin relay 7: pin 3 of VCU controller is in low-side or suspended state, and eight-pin relay 7 is not energized; the third pin of the normally closed contact is connected to the first pin of the static contact, and the fifth pin of the normally closed contact is connected to the second pin of the static contact;

[0070] EHB_PBC1 status: EPB control unit EHB_PBC1 in EHB controller 1 is in invalid mode and has no output;

[0071] Related signals interpreted synchronously by ESC_PBC2: wheel speed forwarded by ESC controller 2, ABS / VDC activation signal, etc.

[0072] According to the control method of the chassis provided in the embodiment of the present application, the control method further includes:

[0073] In the dual-control braking system, when ESC_PBC2 fails, that is, when the second EPB control unit 201 fails, in response to the driver shifting the gear to P gear, the first EPB control unit 101 enters the failed parking backup mode to further receive the "failed parking backup pull-up and release" command issued by the VCU controller 3, thereby realizing the parking pull-up and release action of the right rear electronic caliper 601.

[0074] Specifically, the ESC_PBC2 failure judgment condition: ESC controller 2 loses connection (communication interruption), or ESC controller 2 self-feedback ESC_PBC2 control module has a serious fault and cannot work. Right rear electronic caliper 601 current control path: The current output by EHB_PBC1 passes through the wiring harness hard wire through the fourth and sixth pins of the normally open contact of the eight-pin relay 7, and the first and second pins of the static contact to reach the right rear electronic caliper 601 to achieve control. Eight-pin relay 7 status: VCU controller 3 pin is in the high-side drive state, and the eight-pin relay 7 is energized; the fourth pin of the normally open contact is connected to the first pin of the static contact, and the sixth pin of the normally open contact is connected to the second pin of the static contact. The judgment condition for the VCU controller 3 to issue the "failed parking backup pull-up" command: ESC_PBC2 fails, the gear is in the P gear, and the static signal source 10 sends a static signal.

[0075] In the embodiment, the VCU controller 3 issues the judgment condition of the "failed parking backup release" command: the electric vehicle can be driven, and meets the combination of specific soft signals, and EHB_PBC1 feedbacks that the parking state at this time is the failed parking backup pull-up state. Combination of specific soft signals: as used by current models, within 8s, after the brake pedal opening is ≥90% three times in a row, within 5s, the accelerator pedal opening is ≥5%, and the "failed parking backup release" command can be issued. When the "failed parking backup release" command is about to be enabled, the electric vehicle instrument or large screen should make necessary sound or text prompts.

[0076] In an embodiment, the static signal emitted by the static signal source 10 comes from: the motor speed emitted by a motor controller, or the electric vehicle static / dynamic monitoring signal detected by a sensor emitted by an ADAS controller, or the wheel speed signal transmitted by an encoder.

[0077] According to the embodiment of the present application, a pure electric highly integrated light commercial vehicle chassis is essentially provided, which can solve the problem of new energy light commercial vehicles having no P gear lock configuration. In the event of electronic parking system electronic control failure, the vehicle still has a parking backup function, meeting the regulatory requirement of 8% slope parking.

[0078] According to the chassis of the embodiment of the present application, the electronic parking backup system is matched, the EPB control module is integrated into other parts controllers, and the backup EPB control module can use a self-integrated, general PBC unit, without the need for a separate dual-control parking controller, saving development costs and single-vehicle component costs; it does not occupy a separate space for the entire vehicle layout, and at the same time, while ensuring the intelligence of the parking system and high safety level requirements, it is conducive to the lightweight of the entire vehicle.

[0079] According to the chassis of the embodiment of the present application, the steering column with electric power steering EPS and self-response crumple protection function is easy to operate and can automatically return to the center position to ensure stable straight-line driving; taking into account the handling stability of high-speed driving and the rapid steering of low-speed driving, the recoil transmitted from the impact of the ground on the wheel to the steering wheel should be as small as possible to reduce the driver's fatigue. The steering column with self-response crumple function is matched to improve the crumple response speed and reduce human injuries after vehicle collision. The coaxial electric drive rear axle is matched with a small-power and high-torque motor to simultaneously improve the transmission efficiency of the whole vehicle system. The inclined automatic cooling system is matched to improve the layout space of the whole vehicle. According to the motor temperature and coolant temperature, the automatic cooling system is adjusted to the best working state to reduce the energy consumption of the whole vehicle.

[0080] According to a third aspect of an embodiment of the present application, an electric vehicle is provided. The electric vehicle includes the above chassis, or includes the above powertrain, and also has the above beneficial effects, which will not be repeated here.

[0081] According to a fourth aspect of an embodiment of the present application, an electric vehicle is provided. The electric vehicle applies the above chassis control method, which also has the above beneficial effects, which will not be repeated here.

[0082] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A chassis, characterized in that: The chassis comprises: EHB controller, ESC controller, VCU controller, gear controller, left rear electronic caliper brake, right rear electronic caliper brake, eight-pin relay, wheel speed sensor, EPB switch, static signal source, EPS electric power steering, self-response crumple protection function steering column and coaxial electric drive rear axle; Wherein, the chassis comprises a left rear wheel and a right rear wheel, the left rear wheel is provided with an electronic caliper brake for braking the left rear wheel, and the right rear wheel is provided with an electronic caliper brake for braking the right rear wheel; Wherein, the eight-pin relay includes a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin; The EHB controller is connected to the fourth and sixth pins of the eight-pin relay through communication, the ESC controller is connected to the left rear electronic caliper brake, the third pin of the eight-pin relay, the fifth pin of the eight-pin relay, the wheel speed sensor and the EPB switch through communication, the VCU controller is connected to the seventh pin of the eight-pin relay through communication, and the right rear electronic caliper brake is connected to the third and fifth pins of the eight-pin relay through communication; Wherein, the EHB controller, the ESC controller, the VCU controller and the gear controller are connected to each other in pairs; Wherein, the VCU controller is communicatively connected with the static signal source; Wherein, the EHB controller and the ESC controller are respectively integrated with a first EPB control unit and a second EPB control unit; Wherein, the EPS electric power steering gear is connected to the self-response crumple protection function steering column; Among them, the EPS electric power steering device, the self-responsive crumple protection function steering column and the coaxial electric drive rear axle are communicatively connected in pairs.

2. The chassis according to claim 1, characterized in that: The chassis also includes a radiator assembly and an electronic water pump, and the radiator assembly is connected to the electronic water pump through a water pipe; The EPS electric power steering, the self-response crumple protection function steering column, the coaxial electric drive rear axle, and the electronic water pump are communicatively connected in pairs.

3. A powertrain, characterized in that: The powertrain comprises a chassis as claimed in claim 1 or 2.

4. A method for controlling a chassis, characterized in that: The control method of the chassis is applied to the chassis according to claim 1 or 2, and the control method comprises: Under normal circumstances, the EPS electric power steering device operates the self-responsive crumple protection function steering column. The self-responsive crumple protection function steering column is provided with an angle sensor. The angle sensor converts the rotation signal of the self-responsive crumple protection function steering column and transmits it to the EPS electric power steering device. The EPS electric power steering device has a torque sensor and a speed sensor. The VCU controller receives the angle sensor, torque sensor and speed sensor signals to make judgments and feed back electrical signals to the EPS electric power steering device. The EPS electric power steering device provides steering assistance after receiving the electrical signals.

5. The method for controlling a chassis according to claim 4, characterized in that: The chassis also includes a radiator assembly and an electronic water pump, wherein the radiator assembly is connected to the electronic water pump through a water pipe; the EPS electric power steering, the self-response crumple protection function steering column, the coaxial electric drive rear axle, and the electronic water pump are connected in communication with each other; The control method further comprises: In normal vehicle operation, when the motor temperature of the coaxial electric drive rear axle is greater than 60°C or less than 15°C, the temperature signal of the motor of the coaxial electric drive rear axle is transmitted to the VCU vehicle controller. After determination by the VCU vehicle controller, the electronic water pump is started to pressurize the coolant to the radiator assembly, which is then transported to the coaxial electric drive rear axle after cooling or heating.

6. The method for controlling a chassis according to claim 4, characterized in that: The control method further comprises: When the EPS electric power steering device is deformed and / or damaged by impact, the EPS electric power steering device transmits a signal to the self-response crush protection function steering column to activate the self-response crush protection function.

7. The chassis control method according to claim 4, characterized in that: The control method further comprises: The EPB switch is operated, and the ESC controller converts the received switch signal into an electrical signal and transmits it to the second EPB control unit. The second EPB control unit converts the parking demand into current control of the left rear electronic caliper brake and / or the right rear electronic caliper brake.

8. The chassis control method according to claim 4, characterized in that: The control method further comprises: In the event that the second EPB control unit fails, in response to the driver shifting the gear to P gear, the first EPB control unit enters the fail-park backup mode to further receive the "fail-park backup pull-up and release" command issued by the VCU controller, thereby realizing the parking pull-up and release action of the right rear electronic caliper.

9. An electric vehicle, characterized in that: The electric vehicle comprises the chassis according to claim 1 or 2, or comprises the powertrain according to claim 3.

10. An electric vehicle, characterized in that: The electric vehicle employs the chassis control method according to any one of claims 4 to 8.

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