Hybrid Vehicle Control System for Reverse Drive Force
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Solution Overview
Problem
Conventional hybrid vehicles experience a reduction in drive force when propelling in reverse direction using the engine, due to reaction torque from the motor acting as a generator, which limits propulsion efficiency.
Innovation Solution
A control system for a hybrid vehicle with an engine and at least three motors, featuring a differential mechanism and a controller that manages the motors to generate drive torque while minimizing reaction torque against the engine torque, allowing the third motor to propel the vehicle in reverse direction without establishing reaction torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the motor connected to the power split device operates as a generator to propel the hybrid vehicle in reverse direction, then fuel efficiency is improved, but drive force is reduced due to reaction torque against the engine
Solution Approach 1:
The patent segments the motor functions by assigning different roles to different motors: the first and second motors (connected to the power split device) establish reaction torque against the engine, while the third motor (connected to the output unit) generates drive torque for reverse propulsion. This segmentation allows each motor to perform its specialized function without compromising the other, resolving the contradiction between fuel efficiency and drive force.
Solution Approach 2:
The patent utilizes multi-functionality of the three motors in the hybrid vehicle system. The first and second motors serve dual purposes: they can establish reaction torque against the engine while also contributing to power distribution through the power split device. The third motor provides dedicated drive torque for reverse propulsion. This multi-functional arrangement enables the system to achieve both fuel efficiency and adequate drive force simultaneously.
2Force
If the motor connected to the output unit generates drive torque for reverse propulsion, then drive force is maintained, but reaction torque reduces propulsion efficiency
Solution Approach 1:
The patent segments the torque generation functions by having the third motor dedicated to generating drive torque for reverse propulsion through the output unit, while the first and second motors handle reaction torque establishment. This clear segmentation eliminates the conflict where a single motor would need to simultaneously generate drive torque and establish reaction torque, thereby maintaining both drive force and propulsion efficiency.
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
Prevents undesirable reduction in drive force during reverse propulsion by enabling the third motor to generate drive torque independently, maintaining propulsion efficiency while activating the engine.
Implementation Method 1
control the first motor and the second motor in such a manner as to establish reaction torques against torque of the engine
Implementation Method 2
control the third motor to generate drive torque to propel the hybrid vehicle in a reverse direction
Data Source
AI summary
A control system for hybrid vehicles is provided to prevent reduction in drive force when propelling the vehicle backwardly while activating the engine. In the differential mechanism, a first rotary element is connected to an engine, a second rotary element is connected to a first motor, a third rotary element is connected to a second motor, and a fourth rotary element is connected to an output unit. A third motor is connected to the output unit. When propelling the vehicle backwardly while activating the engine, first motor and the second motor establish reaction torques against engine torque, and the third motor generates drive torque to propel the hybrid vehicle in the reverse direction.