A composite braking system for electric products

Abstract

This utility model relates to the field of electric products for engineering machinery, specifically to a composite braking system for electric products. It includes a vehicle control unit (VCU), a braking mode switching switch, a dual-stroke brake pedal, an accelerator pedal, a drive motor, a drive motor controller, a high-voltage battery, a battery management system (BMS), and instruments. The braking mode switching switch is electrically connected to the VCU to switch braking modes and transmit signals. The dual-stroke brake pedal adopts a segmented structure: the first 30% electronic stroke outputs a voltage signal through a resistor divider, and the latter 70% mechanical stroke controls hydraulic braking through a spring-accumulator structure. The VCU receives signals from each component and outputs control commands. The drive motor controller controls the drive motor torque output and energy recharge. The BMS detects battery status and communicates with the VCU. The instruments are used for parameter setting and transmission to the VCU.

Description

Technical Field

[0001] This utility model relates to the field of electric products for engineering machinery, and specifically to a composite braking system for electric products. Background Technology

[0002] Most existing electric braking systems in construction machinery employ a single-pedal energy recovery mode, where electronic braking is triggered when the accelerator pedal is below a threshold, while hydraulic braking is simultaneously achieved via the brake pedal. Current electro-hydraulic hybrid braking technology lacks a structured division of the brake pedal travel, leading to premature hydraulic braking and energy waste, and also lacks optimized design for the construction of key components. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a composite braking system for electric products, which improves energy recovery efficiency and braking reliability by optimizing the system structure and the construction of key components.

[0004] This utility model is achieved through the following technical solution: a composite braking system for electric products, including a vehicle control unit (VCU), a braking mode switching switch, a dual-stroke brake pedal, an accelerator pedal, a drive motor, a drive motor controller, a high-voltage battery, and a battery management system (BMS).

[0005] The braking mode switching switch is electrically connected to the vehicle controller (VCU) and is used to switch between single-pedal braking mode and dual-pedal braking mode, and transmits the mode signal to the vehicle controller (VCU).

[0006] The dual-stroke brake pedal is divided into an electronic stroke section and a mechanical stroke section. The first 30% of the stroke is the electronic stroke section, which has a built-in resistor voltage divider structure and outputs a 0-5V voltage signal to the vehicle controller (VCU) through the resistor voltage divider. The last 70% of the stroke is the mechanical stroke section, which is equipped with a brake valve spring and an accumulator. The mechanical stroke section controls the accumulator to output brake pressure to the drive axle by pushing the brake valve spring.

[0007] The vehicle control unit (VCU) is electrically connected to the electronic travel segments of the accelerator pedal and the dual-stroke brake pedal, respectively, and receives accelerator pedal signals and voltage signals of the electronic travel segments; the vehicle control unit (VCU) is also electrically connected to the drive motor controller and is used to output torque control commands.

[0008] The drive motor controller is electrically connected to the drive motor and is used to control the drive motor to output positive or negative torque; the drive motor controller is electrically connected to the high-voltage battery through the inverter unit and is used to recharge the high-voltage battery with the electrical energy generated during braking.

[0009] The battery management system (BMS) is electrically connected to the high-voltage battery and is used to detect the SOC value and maximum allowable back-charge current of the high-voltage battery. The battery management system (BMS) is also connected to the vehicle control unit (VCU) via a CAN bus to transmit the SOC value and maximum allowable back-charge current signals to the VCU.

[0010] The 0-5V voltage signal output by the electronic travel segment of the dual-stroke brake pedal is converted into a 0-30% opening signal by the vehicle controller (VCU). One end of the brake valve spring in the mechanical travel segment is connected to the pedal linkage, and the other end is connected to the accumulator control valve. When the pedal travel exceeds 30%, the pedal linkage pushes the brake valve spring to open the accumulator control valve.

[0011] It also includes an instrument panel, which is electrically connected to the vehicle controller (VCU). The instrument panel is equipped with a parameter adjustment module for setting the maximum regenerative torque of the accelerator pedal, the maximum regenerative torque of the brake pedal, and the braking torque ramp parameters, and transmitting the parameter signals to the vehicle controller (VCU).

[0012] The vehicle control unit (VCU) is connected to the brake mode switch, accelerator pedal, and electronic travel segments of the dual-stroke brake pedal via hard wiring; the VCU is also connected to the drive motor controller and battery management system (BMS) via CAN bus communication.

[0013] The beneficial effects of this utility model are as follows: This utility model achieves orderly connection between electronic control and mechanical braking through the segmented structure of the dual-stroke brake pedal, reducing energy loss caused by premature intervention of hydraulic braking; the clear component connection relationship and structural design improve system reliability; the instrument parameter adjustment function enhances system adaptability and is suitable for various engineering machinery electric products. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a block diagram of the composite braking system of this utility model;

[0016] Figure 2 This is a schematic diagram of the dual-stroke brake pedal structure of this utility model. Detailed Implementation

[0017] like Figure 1 and Figure 2 The composite braking system shown includes a vehicle control unit (VCU), a braking mode switch, a dual-stroke brake pedal, an accelerator pedal, a drive motor, a drive motor controller, a high-voltage battery, a battery management system (BMS), and instruments.

[0018] The electronic travel segment of the dual-stroke brake pedal incorporates a voltage divider assembly consisting of a sliding rheostat and a fixed resistor. When the pedal is depressed, the slide moves, outputting a 0-5V voltage signal to the vehicle controller (VCU), which converts it into a 0-30% opening signal. In the mechanical travel segment, the pedal linkage is connected to the brake valve spring. When the travel exceeds 30%, the linkage pushes the brake valve spring to compress, opening the accumulator valve and outputting brake pressure to the drive axle to achieve hydraulic braking.

[0019] The vehicle control unit (VCU) receives signals from the brake mode switching switch, accelerator pedal, and electronic travel segment of the dual-stroke brake pedal via hard wiring. It communicates with the drive motor controller and battery management system (BMS) via the CAN bus. The drive motor controller is connected to the high-voltage battery through the inverter unit, and recharges the battery with electrical energy during braking. The battery management system (BMS) monitors the battery's state of charge (SOC) and maximum allowable recharge current in real time and sends them to the VCU.

[0020] The instrument panel is equipped with a knob or button-type parameter adjustment module. The operator sets the maximum regenerative torque of the accelerator pedal, the maximum regenerative torque of the brake pedal, and the braking torque ramp parameters through the instrument panel. The parameter signals are transmitted to the vehicle controller (VCU) via hardwire.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite braking system for an electrically powered product, characterized in that, This includes the vehicle control unit (VCU), braking mode switch, dual-stroke brake pedal, accelerator pedal, drive motor, drive motor controller, high-voltage battery, and battery management system (BMS). The braking mode switching switch is electrically connected to the vehicle controller (VCU) and is used to switch between single-pedal braking mode and dual-pedal braking mode, and transmits the mode signal to the vehicle controller (VCU). The dual-stroke brake pedal is divided into an electronic stroke section and a mechanical stroke section. The first 30% of the stroke is the electronic stroke section, which has a built-in resistor voltage divider structure and outputs a 0-5V voltage signal to the vehicle controller (VCU) through the resistor voltage divider. The last 70% of the stroke is the mechanical stroke section, which is equipped with a brake valve spring and an accumulator. The mechanical stroke section controls the accumulator to output brake pressure to the drive axle by pushing the brake valve spring. The vehicle control unit (VCU) is electrically connected to the electronic travel segments of the accelerator pedal and the dual-stroke brake pedal, respectively, and receives accelerator pedal signals and voltage signals of the electronic travel segments; the vehicle control unit (VCU) is also electrically connected to the drive motor controller and is used to output torque control commands. The drive motor controller is electrically connected to the drive motor and is used to control the drive motor to output positive or negative torque; the drive motor controller is electrically connected to the high-voltage battery through the inverter unit and is used to recharge the high-voltage battery with the electrical energy generated during braking. The battery management system (BMS) is electrically connected to the high-voltage battery and is used to detect the SOC value and maximum allowable back-charge current of the high-voltage battery. The battery management system (BMS) is also connected to the vehicle control unit (VCU) via a CAN bus to transmit the SOC value and maximum allowable back-charge current signals to the VCU.

2. A composite braking system for an electrically powered product as defined in claim 1, wherein, The 0-5V voltage signal output by the electronic travel segment of the dual-stroke brake pedal is converted into a 0-30% opening signal by the vehicle controller (VCU). One end of the brake valve spring in the mechanical travel segment is connected to the pedal linkage, and the other end is connected to the accumulator control valve. When the pedal travel exceeds 30%, the pedal linkage pushes the brake valve spring to open the accumulator control valve.

3. A composite braking system for an electrically powered product as defined in claim 1, wherein, It also includes an instrument panel, which is electrically connected to the vehicle controller (VCU). The instrument panel is equipped with a parameter adjustment module for setting the maximum regenerative torque of the accelerator pedal, the maximum regenerative torque of the brake pedal, and the braking torque ramp parameters, and transmitting the parameter signals to the vehicle controller (VCU).

4. A composite braking system for an electrically powered product as defined in claim 1, wherein, The vehicle control unit (VCU) is connected to the brake mode switch, accelerator pedal, and electronic travel segments of the dual-stroke brake pedal via hard wiring; the VCU is also connected to the drive motor controller and battery management system (BMS) via CAN bus communication.

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