Load Drive Circuit Abnormal Signal Detection for Actuator Cutoff
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Solution Overview
Problem
Existing drive devices are unable to effectively determine abnormalities in load control signals, which can lead to improper operation of loads such as solenoid valves in automatic transmissions.
Innovation Solution
A drive device that includes a control storage unit for current values of control signals, a drive unit to control semiconductor switches, an acquisition unit to monitor the current driving state, and a determination unit that compares the current driving state with transition determination values to identify abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driver circuit is used to control loads based on microcomputer commands, then the load can be driven during normal operation, but the driver circuit cannot determine abnormalities in load control signals
Solution Approach 1:
The patent applies preliminary action by pre-storing transition determination values that represent valid state transitions in the determination storage unit. Before actual operation, the system prepares all possible valid transition patterns, enabling it to proactively identify abnormal transitions by simple comparison without requiring complex real-time analysis algorithms.
Solution Approach 2:
The patent replaces complex mechanical or algorithmic analysis systems with a simpler information-based system. Instead of using complex computational methods to detect abnormalities, the system substitutes a straightforward comparison mechanism between current state transitions and pre-stored valid transition patterns, significantly reducing device complexity while improving reliability.
2Measurement precision
If the drive device monitors all load states to detect abnormalities, then detection accuracy improves, but the device complexity increases
Solution Approach 1:
The patent applies copying by creating a simplified virtual model of valid load state transitions stored in the determination storage unit. Instead of directly analyzing complex physical states, the system copies valid transition patterns into a manageable data structure, enabling accurate abnormality detection through simple data comparison without requiring complex monitoring hardware.
Solution Approach 2:
The patent changes the parameter representation from complex continuous load states to discrete transition determination values. By converting the monitoring task into comparing discrete state transition parameters against pre-stored valid transitions, the system achieves high detection accuracy while maintaining low device complexity through parameter simplification.
3Reliability
If the drive device compares current state with transition determination values, then abnormal control signals can be accurately determined, but additional storage and comparison components are required
Solution Approach 1:
The patent applies universality by designing the determination storage unit to serve multiple functions: storing valid transition patterns, providing comparison reference data, and enabling abnormality detection. This multi-functional component approach reduces the total number of separate components needed while maintaining high validation accuracy through the universal determination unit.
Data Source
AI summary
A drive device includes: a control storage unit of a current value of a control signal indicating a drive state of each of loads; a drive unit of the switches according to the current value; an acquisition unit of a current drive state of each load; a determination storage unit of a transition determination value; and a determination unit that compares a correlated drive state of each load correlated with the current value with the transition determination value, and determines that the current value is abnormal when the correlated drive state and the transition determination value satisfy a predetermined corresponding relationship.