Vehicle Control Apparatus Torque Transmission Route
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional automatic transmissions experience rapid torque drops during gear shifting, leading to an uncomfortable shifting feeling and reduced power performance when acceleration assistance is required, as the existing systems struggle to maintain driving torque during gear changes.
Innovation Solution
The use of a torque transmission route involving an intermediate shaft, a motor, and a shift position not used before shifting, along with a differential unit connected to a vehicle-driving power plant and a drive shaft, allows for gear changing in various conditions while maintaining drive feeling and improving power performance by switching the output of the drive shaft based on accelerator pedal angle and vehicle status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional automatic transmission uses planetary gear type or countershaft type transmission mechanism with general transmission method, then gear shifting can be achieved, but torque drops rapidly during gear shifting causing uncomfortable shifting feeling
Solution Approach 1:
The patent engages the acceleration assistance clutch before the gear shift occurs, preparing the motor to provide torque support during the upcoming gear transition. This preliminary action ensures that when the gear shift happens and torque would normally drop, the motor is already positioned to compensate and maintain smooth torque delivery throughout the shifting process.
Solution Approach 2:
The patent introduces a motor as an intermediary component between the engine and transmission system. During gear shifting, the motor acts as a mediator that compensates for torque drops by providing additional torque through the acceleration assistance clutch, thereby smoothing the overall torque delivery and eliminating the uncomfortable shifting feeling.
2Power
If acceleration assistance is applied during gear shifting in conventional transmission, then power performance can be improved, but driver experiences strange feeling due to torque drop
Solution Approach 1:
The motor serves as an intermediary that smooths out the torque fluctuations during gear shifting. By engaging the acceleration assistance clutch and having the motor provide compensating torque, the system mediates between the gear shift event and the driver's perception, eliminating the strange feeling while preserving the power performance benefits.
Solution Approach 2:
The control system monitors vehicle status, accelerator pedal angle, and gear shift timing to determine when to apply acceleration assistance. This feedback mechanism ensures that the motor provides torque support precisely when needed during gear shifting, creating a smooth driving experience while maintaining improved power performance.
Data Source
AI summary
A transmission system in a vehicle using a motor to transmit power assists acceleration by generating auxiliary engine power during acceleration in addition to gear changing by the motor. Where acceleration assistance is added, torque transition is conducted along a torque transmission route of dog clutch, second intermediate shaft, motor, first intermediate shaft, and gear position of first intermediate shaft before shifting so as to avoid the torque reduction in uncomfortable shocks and feelings to the driver due to torque reduction when shifting.