Vehicle Control CPU Backup Memory Abnormality Detection
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Solution Overview
Problem
Conventional vehicle-mounted electronic control apparatuses lack a versatile and efficient means for quickly checking the contents of backup memory, leading to excessive control load on the microprocessor and unreliable abnormality detection, especially in situations involving battery voltage fluctuations or noise-induced malfunctions.
Innovation Solution
A vehicle-mounted electronic control apparatus that incorporates a power supply turn-on detection section, a hierarchization abnormality detection section, and an abnormality detection selection section to selectively execute various abnormality detection schemes at different timings, such as startup, operation, and shutdown, reducing the control load on the microprocessor and improving backup memory reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If comprehensive abnormality detection methods are implemented for backup memory, then detection reliability is improved, but control load on microprocessor increases
Solution Approach 1:
The abnormality detection function is segmented into multiple independent detection sections (first abnormality detection section, second abnormality detection section, third abnormality detection section), each handling specific detection tasks. This segmentation allows the microprocessor to distribute detection loads across different time periods and operational states, reducing peak control load while maintaining comprehensive detection coverage.
Solution Approach 2:
Different abnormality detection sections are activated periodically based on operational conditions: the first section operates during specific states, the second section during other states, and the third section during particular operational phases. This periodic activation pattern ensures continuous monitoring while preventing simultaneous execution of all detection routines, thereby managing control load effectively.
2Reliability
If comprehensive abnormality detection methods are implemented for backup memory, then detection reliability is improved, but control response speed deteriorates
Solution Approach 1:
The detection system is divided into multiple specialized detection sections that operate independently during different operational states. This segmentation enables the system to perform comprehensive checks without requiring all detection routines to execute simultaneously, thus maintaining fast control response while ensuring thorough abnormality detection.
Solution Approach 2:
Different detection sections are activated based on periodic operational conditions and state transitions. By scheduling detection activities according to operational phases rather than executing all checks continuously, the system achieves reliable detection without compromising control response speed during critical operational periods.
3Device complexity
If simple abnormality detection methods are used for backup memory, then control load is reduced, but detection precision deteriorates
Solution Approach 1:
Different detection sections implement detection methods tailored to specific operational conditions and memory states. Each detection section is optimized for its particular context, applying appropriate detection precision where needed while maintaining lower control load in other areas. This local optimization ensures high detection precision for critical abnormalities without uniformly increasing control load across all operations.
Data Source
AI summary
A vehicle-mounted electronic control apparatus can perform a variety of abnormality detections while reducing the control load of a microprocessor in the abnormality detection of a volatile backup memory that is backed up by an on-board battery. The apparatus includes a control CPU which is fed with power from a main power supply circuit upon closure of a power switch, a nonvolatile control memory and a backup memory. Even if the power switch is opened, the backup memory, being a partial area of a RAM memory, is fed with power through an auxiliary power supply circuit connected directly to the battery. When the battery is replaced with a new one and connected again, a power supply interruption monitoring memory is reset. At the start of operation of the control CPU, the backup memory is initialized based on reset information, and the power supply interruption monitoring memory is rewritten into a set state.