Power Transmission Controller Torque Prediction
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Solution Overview
Problem
Existing power transmission systems experience shift shock when changes in the operating states of motors and engines overlap with transmission unit shifts, leading to poor response to driver-required changes in driving force.
Innovation Solution
A controller for the power transmission system that varies torque transmission capacities of engagement devices based on the operating states of the motor and engine, predicting variations in input torque to ensure smooth gear shifts and prevent shift shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine start or stop operation is prioritized over transmission shift when they overlap, then the engine can be started/stopped smoothly, but the response to driver-required changes in driving force becomes poor
Solution Approach 1:
The control device predicts the timing of engine start or stop and performs preliminary actions to prepare for the overlapping shift operation. By anticipating when the engine will start or stop, the system can pre-adjust transmission shift parameters to prevent shift shock while ensuring the engine operation completes successfully, thereby resolving the contradiction between engine operation reliability and driving force response productivity
2Reliability
If the transmission shift is prioritized over engine start or stop when they overlap, then the shift can be executed smoothly, but shift shock occurs due to torque variation
Solution Approach 1:
The control device predicts the timing of engine start or stop and performs preliminary actions to prepare for the overlapping shift operation. By anticipating when the engine will start or stop, the system can pre-adjust transmission shift parameters to prevent shift shock while ensuring the engine operation completes successfully, thereby resolving the contradiction between engine operation reliability and driving force response productivity
3Reliability
If any one operation (engine start/stop or transmission shift) is carried out first and the other next, then one operation completes successfully, but the response to driver-required changes in driving force becomes poor
Solution Approach 1:
The control device predicts the timing of engine start or stop and performs preliminary actions to prepare for the overlapping shift operation. By anticipating when the engine will start or stop, the system can pre-adjust transmission shift parameters to prevent shift shock while ensuring the engine operation completes successfully, thereby resolving the contradiction between engine operation reliability and driving force response productivity
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
The controller enables immediate attainment of desired driving force while suppressing shift shock, even when changes in motor and engine states overlap with transmission unit shifts, by adjusting torque transmission capacities in advance.
Implementation Method 1
The transmission unit establishes a plurality of gears having different speed ratios by frictional engagement devices
Data Source
AI summary
A controller for a power transmission system that uses an engine and a motor as driving force sources to transmit power and that includes a transmission unit is provided. The transmission unit has a plurality of engagement devices and establishes a plurality of gears having different speed ratios by the frictional engagement devices. The transmission unit is arranged downstream of the driving force sources. The controller includes a torque transmission capacity setting unit that, when the transmission unit shifts gears, varies torque transmission capacities of the frictional engagement devices on the basis of an operating state of the motor and an operating state of the engine.