Transmission Ratio Control With Map-Switching Abnormality Detection
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Solution Overview
Problem
Existing transmission ratio controllers for vehicles do not effectively determine whether the control mode switching for the transmission ratio is in accordance with its specification, particularly lacking detection of switching mode changes.
Innovation Solution
A transmission ratio controller with circuitry that includes a calculator to determine the request transmission ratio using different maps based on engine states, an instructor to actuate the transmission mechanism, and an abnormality determiner to compare calculated and actual ratios, ensuring proper mode switching and detecting abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission ratio controller switches control mode based on engine state parameters, then the transmission ratio control adapts to different engine conditions, but the system cannot detect whether the mode switching occurs correctly according to specifications
Solution Approach 1:
The abnormality determiner calculates a hypothetical transmission ratio using the second transmission ratio map based on the second state, then compares this hypothetical ratio with the actual transmission ratio from sensors to detect whether mode switching occurred correctly. This feedback mechanism enables detection of control mode switching accuracy.
Solution Approach 2:
The system pre-calculates the hypothetical transmission ratio using the second transmission ratio map before actual mode switching occurs. This preliminary calculation allows the system to have a reference value ready for comparison, enabling immediate detection of switching abnormalities.
2Manufacturing precision
If the system uses multiple transmission ratio maps for different engine states, then the transmission ratio control precision improves, but the system complexity increases
Solution Approach 1:
The transmission ratio control is segmented into multiple transmission ratio maps (first and second maps) corresponding to different engine states. Each map is optimized for specific engine conditions, allowing precise control while maintaining clear separation of control logic for different operating scenarios.
Solution Approach 2:
The system dynamically selects between different transmission ratio maps based on engine state parameters. The abnormality determiner dynamically calculates hypothetical ratios using the alternative map to detect switching abnormalities, enabling adaptive control without permanent structural complexity.
Data Source
AI summary
A transmission ratio controller includes circuitry that includes a transmission ratio calculator calculating a request transmission ratio, a transmission ratio instructor transmitting a control signal, and an abnormality determiner. The request transmission ratio is calculated using a first transmission ratio map when a specified parameter satisfies a first condition, and a second transmission ratio map when the specified parameter satisfies a second condition. The internal combustion engine is in a first state when the specified parameter satisfies the first condition, and in a second state when the specified parameter satisfies the second condition. In the first state, the abnormality determiner calculates a hypothetical transmission ratio using the second transmission ratio map based on the second state. The abnormality determiner determines an abnormality based on a comparison of the hypothetical transmission ratio with at least one of the request transmission ratio, an instruction transmission ratio, or an actual transmission ratio.