Drive Control Apparatus Adaptive Torque Abnormality Detection
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Solution Overview
Problem
Existing drive control apparatuses for prime movers determine abnormalities in output torque control based on a constant time period, leading to erroneous determinations when torque differences are small or large, and require excessively long times for large torque differences.
Innovation Solution
A drive control apparatus that calculates a target torque and estimated output torque, accumulates a torque difference value over time, and sets a determination threshold, allowing for adaptive determination times based on torque differences, with correction coefficients and multiple determining methods to enhance accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant predetermined time period is used for abnormality determination, then the determination process is simple, but the determination accuracy deteriorates when torque difference is small or the determination time becomes excessively long when torque difference is large
Solution Approach 1:
The patent applies dynamics by making the determination threshold dynamic rather than constant. The threshold is adjusted based on the magnitude of torque difference: when torque difference is large, the threshold is set higher to enable faster determination; when torque difference is small, the threshold is set lower to maintain determination accuracy. This resolves the contradiction by adapting the threshold to the actual system state.
Solution Approach 2:
The patent changes the parameter of the determination threshold based on the torque difference magnitude. By establishing a relationship where the threshold varies with torque difference, the system achieves both fast determination for large torque differences and accurate determination for small torque differences, resolving the contradiction between determination speed and accuracy.
2Loss of time
If a short predetermined time period is used, then the determination time is reduced, but erroneous determination occurs easily when torque difference is small
Solution Approach 1:
The patent changes the determination threshold parameter based on torque difference magnitude. For small torque differences, a lower threshold is set to maintain reliability and avoid erroneous determinations, while for large torque differences, a higher threshold enables faster determination. This dynamic parameter adjustment resolves the contradiction between determination time and reliability.
Solution Approach 2:
The system dynamically adjusts the determination threshold according to the actual torque difference conditions. This dynamic adaptation allows the system to maintain high reliability for small torque differences while achieving fast determination for large torque differences, resolving the contradiction between speed and reliability.
3Measurement precision
If a long predetermined time period is used, then determination accuracy is improved for small torque differences, but the determination time becomes excessively long for large torque differences
Solution Approach 1:
The patent establishes a parameter change mechanism where the determination threshold is adjusted according to torque difference magnitude. For large torque differences, the threshold is set higher, enabling faster determination without sacrificing accuracy. For small torque differences, the threshold is set lower to ensure accurate detection. This resolves the contradiction between accuracy and determination time.
Solution Approach 2:
The system dynamically adapts the determination threshold to match the torque difference conditions. This dynamic adjustment allows the system to achieve both fast determination for large torque differences and accurate determination for small torque differences, resolving the contradiction between determination speed and accuracy.
Data Source
AI summary
A drive control apparatus in which the target torque which is a target value of an output torque of the prime mover for driving a vehicle, is calculated, and the output torque control is performed so that the output torque of the prime mover coincides with the target torque, is provided. An estimated output torque which is an estimated value of the actual output torque of the prime mover, is calculated, and the torque difference accumulated value which approximates a time-integration value of a torque difference between the target torque and the estimated output torque, is calculated. It is determined that an abnormality has occurred in the output torque control when the torque difference accumulated value exceeds a determination threshold value which is set to a constant value.