Hybrid Vehicle Shift Control via Motor Reverse Torque
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Solution Overview
Problem
Hybrid vehicles with automated manual transmissions experience power loss and increased friction due to elements like reverse gears and synchronizer rings, which are not necessary for backward movement, leading to inefficiencies in fuel consumption and noise.
Innovation Solution
A shift control apparatus for hybrid vehicles that controls backward movement using motors and transmission without dedicated backward movement elements, employing an engine clutch, first and second motors, and a vehicle controller to manage torque and gear shifting, thereby eliminating the need for reverse gears and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reverse gears, synchronizer rings, and other backward movement elements are installed in the transmission, then the vehicle can move backward, but the device complexity and weight increase
Solution Approach 1:
The patent removes reverse gears, synchronizer rings, and other dedicated backward movement elements from the transmission system. The vehicle achieves backward movement by releasing the engine clutch and controlling the motor to rotate in reverse, extracting unnecessary mechanical components while maintaining the required functionality.
Solution Approach 2:
The transmission system is designed to handle both forward and backward movement using the same gear structure. The engine clutch and motor serve multiple functions: they can engage for forward movement through the transmission gears and release for backward movement by allowing the motor to rotate the input shaft in reverse, making the system universal for bidirectional operation.
2Adaptability or versatility
If reverse gears and synchronizer rings are present in the transmission, then backward movement is enabled, but power loss and friction increase
Solution Approach 1:
The patent extracts reverse gears, synchronizer rings, and other backward movement elements from the transmission system. By removing these components, the source of friction and power loss is eliminated. The vehicle moves backward by releasing the engine clutch and controlling motor rotation direction, avoiding the energy losses associated with mechanical reverse gear engagement.
3Device complexity
If dedicated backward movement elements are removed from the transmission, then device complexity and weight decrease, but the ability to move backward must be achieved through alternative means
Solution Approach 1:
The patent replaces the mechanical reverse gear system with an electrical-mechanical control system. Instead of using dedicated reverse gears and synchronizer rings, the system uses the engine clutch release mechanism combined with motor control to achieve backward movement. The motor can be controlled to rotate in reverse, driving the input shaft and transmission system in the opposite direction, substituting mechanical reverse elements with electrical control.
4Object-affected harmful factors
If reverse gear shifting is eliminated, then noise and vibration are reduced, but the mechanism for backward movement must be fundamentally changed
Solution Approach 1:
The patent extracts reverse gears, synchronizer rings, and other backward movement elements from the transmission system. By removing these components, the source of noise and vibration during reverse gear shifting is eliminated. The vehicle moves backward by releasing the engine clutch and controlling motor rotation, avoiding the harmful noise and vibration associated with mechanical reverse gear engagement and synchronizer operation.
Solution Approach 2:
The patent replaces the mechanical reverse gear shifting system with an electrical-mechanical control system. Instead of engaging reverse gears that produce noise and vibration, the system uses engine clutch release combined with motor control to achieve smooth backward movement. The motor can be controlled to rotate in reverse, eliminating the harmful acoustic and vibrational effects of traditional reverse gear shifting.
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 costs and weight, enhances transmission efficiency, improves fuel consumption, and minimizes noise and vibration associated with gear changes by eliminating the need for reverse gear shifting.
Implementation Method 1
a first motor 130 which is connected to the input shaft of the transmission 150 and provides a rotational torque to the input shaft
Implementation Method 2
an engine clutch 120 positioned between the engine 110 and the first motor 130 and selectively connecting the engine and the first motor
Data Source
AI summary
A shift control apparatus for a hybrid vehicle, capable of moving backward through control of a motor and a transmission. The shift control apparatus for the hybrid vehicle includes an engine as a power source; first and second motors connected to the engine; an engine clutch positioned between the engine and the first motor and selectively connecting the engine and the first motor; a transmission receiving a driving torque from at least one of the engine and first motor by a release or an engagement of the engine clutch; and a vehicle controller releasing the engine clutch if a backward moving request signal is input. The shift control apparatus further confirms a backward moving torque amount when the speed of the vehicle is a reference speed or less, and controls the first motor based on the backward moving torque amount for the vehicle to be moved backward.