Direct-Coupled Regenerative Motor for Hybrid Vehicle Energy Recovery
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Solution Overview
Problem
Conventional hybrid vehicles face inefficiencies in collecting kinetic energy as regenerative electric power, especially at high speeds, due to the restriction of rotational speed ranges caused by transmissions when coupled with IPM motors, leading to energy loss and reduced regenerative power collection.
Innovation Solution
A parallel-type hybrid vehicle configuration where the regenerative motor is directly coupled to the wheel drive shaft without being coupled to the transmission, utilizing a switched reluctance motor with high efficiency at 75% of its maximum rotational speed, allowing direct transmission and regeneration of kinetic energy without energy loss through the transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor is coupled to the driving shaft via a transmission, then the rotational speed range of the motor is restricted, but regenerative electric power collection is limited in high-speed ranges
Solution Approach 1:
The patent extracts the motor from the transmission system and couples it directly to the driving shaft. This removes the transmission as an intermediary component, allowing the motor to operate across a wider rotational speed range without being constrained by transmission gear ratios, thereby enabling efficient regenerative power collection at high speeds
Solution Approach 2:
The motor is designed to serve multiple functions: it acts as both a drive motor for vehicle propulsion and a generator for regenerative braking across the entire operational speed range. By coupling directly to the driving shaft, the motor can efficiently perform regenerative energy collection at high speeds while maintaining drive functionality across all speed ranges
2Productivity
If the motor is coupled to the driving shaft via a transmission, then power transmission is achieved, but kinetic energy input causes energy loss
Solution Approach 1:
The transmission is removed from the power transmission path between the motor and driving shaft. This eliminates energy losses associated with transmission efficiency, allowing direct power transmission while maintaining the ability to transmit power effectively across all operating conditions
Solution Approach 2:
The motor and driving shaft are merged into a direct coupling arrangement, eliminating the transmission interface. This direct connection ensures that all kinetic energy from the wheels is efficiently transferred to the motor for regeneration without losses in the transmission system
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 configuration enables efficient collection and utilization of kinetic energy as regenerative electric power across a wide rotational speed range, improving fuel economy and reducing energy loss, while allowing for a compact and lightweight design with reduced control complexity and space requirements.
Implementation Method 1
when the vehicle is decelerated, kinetic energy is converted into electric power (regenerative electric power) by a regenerative braking operation of the motor
Data Source
AI summary
A hybrid vehicle includes an engine: a regenerative motor for use when the hybrid vehicle runs, the motor having characteristics such that the motor efficiency is 90% or more at a rotational speed of 75% of the maximum rotational speed of the motor when the load of the motor is 10% or more of the maximum load of the motor; and a transmission which transmits the power of the engine to a wheel drive shaft. The motor is coupled to the wheel drive shaft without being coupled to the transmission.