Main hanging coordination type energy recovery control method and system

Abstract

The invention relates to a main-trailer coordination type energy recovery control method and system, and the method comprises the following steps: main vehicle and trailer signal collection: respectively collecting a main vehicle signal and a trailer signal; the collected main vehicle signals and trailer signals are input to an HCU main vehicle controller through a CAN bus; energy recovery required torque of the main vehicle and the trailer is calculated through an HCU main vehicle controller; the HCU main vehicle controller carries out torque arbitration on the calculated main vehicle and trailer energy recovery torque, and then braking energy recovery is carried out through a torque arbitration result; the main vehicle and the trailer are cooperatively considered, and the braking energy of the trailer is considered in the energy recovery process, so that the energy recovery level is improved, the energy-saving level is improved, and the endurance mileage is increased; and the consistent braking strength of the main vehicle and the trailer is taken as a target, so that the'vehicle pushing 'phenomenon in the braking process is avoided, and the potential safety hazard in the braking process is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy commercial vehicles, and in particular to a main-hook coordinated energy recovery control method and system. Background Art

[0002] Braking energy recovery is one of the main means of energy saving for new energy vehicles. Its working principle is that when the vehicle is coasting or braking, the kinetic energy of the wheels generates electricity through the reverse drive motor, and the electricity is stored in the power battery. When the truck needs power output, the power battery releases electricity, thereby realizing the recovery and utilization of braking energy. Through this technology, about 15% of energy consumption can be achieved, thereby increasing the vehicle's cruising range by 10%-30%.

[0003] For new energy commercial vehicles, especially new energy heavy-duty trucks, the current braking energy recovery control technology mainly draws on the technical route of passenger cars. It only considers the main vehicle as the main body of braking energy recovery to build a control system, while the braking energy recovery of the trailer is basically not considered, resulting in a low energy recovery level; at the same time, since the inertia of the trailer is not considered in a coordinated manner, when the main vehicle performs braking energy recovery, the energy recovery demand torque calculated only based on the braking efficiency of the main vehicle is smaller than the actual one. In order to achieve the desired braking effect, additional braking torque is required, resulting in increased gas consumption and increased friction plate wear; and since the trailer and the main vehicle are not considered in a coordinated manner, when the main vehicle performs braking energy recovery, the trailer will cause a "pushing car" phenomenon due to inertia, creating serious safety hazards. Summary of the invention

[0004] The purpose of the present invention is to provide a main-hook coordinated energy recovery control method and system to address the deficiencies in the prior art.

[0005] The present invention is achieved by adopting the following technical solutions: A main-hook coordinated energy recovery control method comprises the following steps: S1, main vehicle and trailer signal collection, collect main vehicle signals and trailer signals respectively; S2, input the collected main vehicle signal and trailer signal to the HCU main vehicle controller through the CAN bus; S3, calculate the energy recovery required torque of the main vehicle and trailer through the HCU main vehicle controller; S4, the HCU main vehicle controller performs torque arbitration on the calculated energy recovery torque of the main vehicle and trailer, and then performs brake energy recovery based on the torque arbitration result.

[0006] Furthermore, the main vehicle signal includes the main vehicle signal collected by MCU motor controller signal, BMS battery management controller signal, IC instrument controller signal, EBC battery replacement controller signal, CPD controller signal, and TVCU vehicle controller signal; the trailer signal includes the trailer signal collected by the TVCU vehicle controller.

[0007] Furthermore, an energy recovery module is provided in the HCU main vehicle controller, which receives the main vehicle signal and the trailer signal, distributes the braking strength of the main vehicle and the trailer so that the braking strength of the main vehicle and the trailer remain consistent, and calculates the energy recovery required torque of the main vehicle and the trailer.

[0008] Furthermore, in S3, in order to prevent the vehicle from being pushed, the braking strength of the main vehicle and the trailer must be kept consistent, including: S3-1, obtaining the energy recovery torque required by the main vehicle; S3-2, obtaining the proportion of the main vehicle and trailer bearing loads, wherein the main vehicle and trailer bearing loads are obtained through the vehicle load identification MAP table; S3-3, calculate the required torque of trailer energy recovery. The braking strength of the main vehicle and trailer must be consistent, that is: in, The main vehicle braking force, is the main vehicle axle load ratio, Braking force for trailer, is the trailer axle load ratio, is the main vehicle braking strength, is the trailer braking strength, is the tire radius, is the trailer speed ratio, Required torque for trailer energy recovery.

[0009] A main-mounted coordinated energy recovery control system is used to implement any of the main-mounted coordinated energy recovery control methods described above, including an acquisition system and a control computing system. The acquisition system and the control computing system are connected via a CAN bus. The acquisition system includes an MCU motor controller, a BMS battery management controller, an IC instrument controller, an EBC battery replacement controller, a CPD controller, and a TVCU vehicle controller. The control computing system includes an HCU main vehicle controller.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects: 1. By considering the main vehicle and trailer in a coordinated manner, the energy recovery process takes into account the braking energy of the trailer, thereby improving the energy recovery level, improving the energy saving level, and increasing the cruising range; 2. The main vehicle and trailer are coordinated to perform brake energy recovery control, which can minimize gas consumption and reduce friction plate wear; 3. The goal is to make the braking strength of the main vehicle and the trailer consistent, thereby avoiding the "pushing the vehicle" phenomenon during braking and eliminating safety hazards during braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a control flow chart of the present invention. DETAILED DESCRIPTION

[0012] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0013] A main-hook coordinated energy recovery control method comprises the following steps: S1, main vehicle and trailer signal collection, collect main vehicle signals and trailer signals respectively; S2, input the collected main vehicle signal and trailer signal to the HCU main vehicle controller through the CAN bus; S3, calculate the energy recovery required torque of the main vehicle and trailer through the HCU main vehicle controller; S4, the HCU main vehicle controller performs torque arbitration on the calculated energy recovery torque of the main vehicle and trailer, and then performs brake energy recovery based on the torque arbitration result.

[0014] The main vehicle signal includes the MCU motor controller signal, the BMS battery management controller signal, the IC instrument controller signal, the EBC battery replacement controller signal, the CPD controller signal, and the main vehicle signal collected by the TVCU vehicle controller; the trailer signal includes the trailer signal collected by the TVCU vehicle controller.

[0015] An energy recovery module is provided in the HCU main vehicle controller, which receives the main vehicle signal and the trailer signal, distributes the braking strength of the main vehicle and the trailer to keep the braking strength of the main vehicle and the trailer consistent, and calculates the energy recovery required torque of the main vehicle and the trailer.

[0016] In S3, in order to prevent the vehicle from being pushed, the braking strength of the main vehicle and the trailer must be consistent, including: S3-1, obtaining the energy recovery torque required by the main vehicle; S3-2, obtaining the proportion of the main vehicle and trailer bearing loads, wherein the main vehicle and trailer bearing loads are obtained through the vehicle load identification MAP table; S3-3, calculate the required torque of trailer energy recovery. The braking strength of the main vehicle and trailer must be consistent, that is: in, The main vehicle braking force, is the main vehicle axle load ratio, Braking force for trailer, is the trailer axle load ratio, is the main vehicle braking strength, is the trailer braking strength, is the tire radius, is the trailer speed ratio, Required torque for trailer energy recovery.

[0017] A main-mounted coordinated energy recovery control system is used to implement any of the main-mounted coordinated energy recovery control methods described above, including an acquisition system and a control computing system. The acquisition system and the control computing system are connected via a CAN bus. The acquisition system includes an MCU motor controller, a BMS battery management controller, an IC instrument controller, an EBC battery replacement controller, a CPD controller, and a TVCU vehicle controller. The control computing system includes an HCU main vehicle controller.

Claims

1. A main-mounted coordinated energy recovery control method, characterized in that: The following steps are involved: S1, main vehicle and trailer signal collection, collect main vehicle signals and trailer signals respectively; S2, input the collected main vehicle signal and trailer signal to the HCU main vehicle controller through the CAN bus; S3, calculate the energy recovery required torque of the main vehicle and trailer through the HCU main vehicle controller; S4, the HCU main vehicle controller performs torque arbitration on the calculated energy recovery torque of the main vehicle and trailer, and then performs brake energy recovery based on the torque arbitration result.

2. The main-mounted coordinated energy recovery control method according to claim 1 is characterized in that: The main vehicle signal includes MCU motor controller signal, BMS battery management controller signal, IC instrument controller signal, EBC battery replacement controller signal, CPD controller signal, and main vehicle signal collected by TVCU vehicle controller; the trailer signal includes trailer signal collected by TVCU vehicle controller.

3. The main-hook coordinated energy recovery control method according to claim 2 is characterized in that: The HCU main vehicle controller is provided with an energy recovery module, which receives the main vehicle signal and the trailer signal, distributes the braking strength of the main vehicle and the trailer to keep the braking strength of the main vehicle and the trailer consistent, and calculates the energy recovery required torque of the main vehicle and the trailer.

4. The main-hook coordinated energy recovery control method according to claim 1, characterized in that: In S3, in order to prevent the vehicle from being pushed, the braking strength of the main vehicle and the trailer must be consistent, including: S3-1, obtaining the energy recovery torque required by the main vehicle; S3-2, obtaining the proportion of the main vehicle and trailer bearing loads, wherein the main vehicle and trailer bearing loads are obtained through the vehicle load identification MAP table; S3-3, calculate the required torque of trailer energy recovery. The braking strength of the main vehicle and trailer must be consistent, that is: in, The main vehicle braking force, is the main vehicle axle load ratio, Braking force for trailer, is the trailer axle load ratio, is the main vehicle braking strength, is the trailer braking strength, is the tire radius, is the trailer speed ratio, Required torque for trailer energy recovery.

5. A main-mounted coordinated energy recovery control system, used to implement the main-mounted coordinated energy recovery control method according to any one of claims 1 to 4, characterized in that: It includes an acquisition system and a control computing system. The acquisition system and the control computing system are connected via a CAN bus. The acquisition system includes an MCU motor controller, a BMS battery management controller, an IC instrument controller, an EBC battery replacement controller, a CPD controller, and a TVCU vehicle controller. The control computing system includes an HCU main vehicle controller.

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