Two-Motor Hybrid Power System for Extended EV Range
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Solution Overview
Problem
Hybrid electric vehicles face limitations in increasing the travel distance and output in EV mode due to the capacity constraints of single motors in TMED systems, necessitating innovative arrangements to enhance motor efficiency and fuel consumption reduction.
Innovation Solution
A power system with two motors is designed, where the first motor transmits power to or receives power from the engine output shaft, and the second motor outputs power to the transmission input shaft, with strategically placed clutches, bearings, and resolvers to optimize torque generation and energy distribution, allowing one motor to generate electricity while the other propels the vehicle, thereby increasing travel distance and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the capacity of a single motor is increased to expand EV mode travel distance, then the travel distance in EV mode increases, but the motor size and complexity increase significantly
Solution Approach 1:
The power system is segmented into two separate motors (first motor and second motor) instead of using a single oversized motor. The first motor handles power transmission to the engine output shaft while the second motor provides power to the transmission input shaft, allowing the vehicle to achieve extended EV mode travel distance through coordinated operation of multiple smaller motor units rather than one large motor.
2Power
If two motors are added to increase output and travel distance, then the vehicle output and travel distance increase, but the system complexity and number of components increase
Solution Approach 1:
The power system merges the functions of two motors into a coordinated system where the first motor transmits power to the engine output shaft and the second motor outputs power to the transmission input shaft. This merging of multiple power sources into a unified control system allows the vehicle to achieve increased output and extended EV mode capability while managing system complexity through integrated clutch mechanisms and power flow management.
Solution Approach 2:
The two-motor system provides multi-functionality by enabling the vehicle to operate in multiple modes: the first motor can transmit power to the engine, the second motor can provide direct power to the transmission, and both motors can work together to extend EV mode travel distance. This universal design allows a single power system configuration to handle various operating conditions and power delivery requirements.
Data Source
AI summary
A power system having two motors includes: a first motor transmitting power to an output shaft of an engine or receiving power from the output shaft of the engine; a first clutch selectively connecting a first rotor of the first motor to the output shaft and mounted on a first power transmitting member that operably connects the output shaft and the first rotor of the first motor; a second motor outputting power to an input shaft of a transmission; and a second clutch selectively connecting the output shaft to a second rotor of the second motor and mounted on a second power transmitting member that operably connects the output shaft and the second rotor of the second motor.