Electric Motor Regenerative Braking Torque Control
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Solution Overview
Problem
Moderate-speed vehicles with frequent stops and deceleration actions experience rapid wear and tear of mechanical braking systems, leading to increased maintenance costs due to the high frequency of braking actions.
Innovation Solution
A process for electrical assistance to braking, where the electric motor system generates a braking torque based on information from the hydraulic braking circuit, assisting the mechanical braking system and reducing wear on mechanical components by permanently coupling the electric motor's output shaft to the wheel shaft, allowing for direct and reliable torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical braking is used for frequent stops and deceleration actions, then the braking function is achieved, but the mechanical parts wear out quickly and maintenance costs increase
Solution Approach 1:
The patent replaces mechanical braking with electrical braking by using the electric motor as a generator during deceleration. The motor converts kinetic energy into electrical energy, creating an electromagnetic torque that opposes the rotation and provides braking force, thereby eliminating mechanical contact and wear.
Solution Approach 2:
The patent converts the harmful effect of kinetic energy during deceleration (which causes wear in mechanical braking) into a beneficial effect by using it to generate electrical energy through the electric motor operating as a generator. This simultaneously provides braking force and recharges the battery.
2Object-generated harmful factors
If electric motor is used to assist braking, then wear on mechanical components is reduced, but the system complexity increases
Solution Approach 1:
The patent makes the electric motor perform multiple functions: it serves as a drive motor during acceleration and as a generator for electrical braking during deceleration. This multi-functionality eliminates the need for separate braking mechanisms, reducing overall system complexity despite the advanced control requirements.
Solution Approach 2:
The patent merges the braking function with the electric motor system. The same motor that provides propulsion also provides braking through regenerative braking, combining two previously separate functions into one integrated system.
3Reliability
If permanent coupling between electric motor output shaft and wheel shaft is implemented, then torque transmission reliability is improved, but the ease of repair decreases
Solution Approach 1:
The patent replaces mechanical coupling with permanent magnetic coupling through the electric motor. The magnetic field provides a direct and reliable connection between the motor shaft and wheel shaft without mechanical wear, while the electronic control system manages the torque transmission, improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the wear and tear on mechanical braking components, lowers maintenance costs, and provides a smooth, effective braking experience by using the electric motor to assist mechanical braking, while also recharging the motor's power supply during braking.
Implementation Method 1
the operation by generator of the electric motor makes it possible to recharge the power-supply means of said electric motor
Implementation Method 2
a mechanical braking device that is activated by means of a hydraulic circuit
Data Source
AI summary
A process for electrical assistance to the braking of a vehicle with a motor system (M), whereby the motor system (M) includes at least one electric motor (10) whose output shaft (14) is coupled to a primary shaft (20) that drives at least one wheel (22) of the vehicle, at least one wheel (22) of the vehicle being equipped with a mechanical braking device that is activated by a hydraulic circuit, whereby the process is characterized in that it includes: collecting information in the hydraulic circuit of the primary braking circuit, and using the information as a set-point for a braking torque generated by the electric motor (10) and exerted on the primary drive shaft (20) of the wheels.