Automatic Transmission Load Control for Engine Speed Stability
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Solution Overview
Problem
The stability of engine speed is compromised when the load on the input shaft of an automatic transmission is released, leading to unstable engine control due to variations in load calculation.
Innovation Solution
A control apparatus is implemented with a detection unit in the automatic transmission and a processing unit that generates and transmits load information to the engine control apparatus, using dummy information when the load on the input shaft is released to stabilize engine speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If load information based on detection results is transmitted from automatic transmission to engine control apparatus, then engine control accuracy is improved, but engine speed stability deteriorates when load on input shaft is released
Solution Approach 1:
The patent changes the parameter being transmitted (load information) based on the operating state. When the automatic transmission is in a non-running gear range (N or P range) where the input shaft load is released, dummy load information is transmitted instead of actual detection-based load information. This parameter switching resolves the contradiction by preventing unstable load calculations from affecting engine speed control during states where load detection is unreliable.
2Speed
If engine control is performed using real-time load information from automatic transmission, then responsiveness is improved, but engine speed fluctuation increases in neutral or parking range
Solution Approach 1:
The patent implements dynamic control by adapting the information transmission strategy based on the operating state. The control apparatus dynamically switches between transmitting actual load information (during running gear ranges) and dummy load information (during non-running gear ranges). This dynamic adaptation maintains fast response during normal operation while ensuring stability during neutral or parking range transitions.
Data Source
AI summary
A control apparatus configured to control an automatic transmission to which a driving force of an engine is input includes a detection unit provided in the automatic transmission, and a processing unit configured to generate load information concerning a load on the automatic transmission based on the detection result of the detection unit and transmit the load information to the control apparatus of the engine. The processing unit transmits dummy information that is not based on the detection result of the detection unit as the load information at least on condition that the automatic transmission is in an operation state in which a load on an input shaft is released.