Vehicle Motion Control System Coordinated Operation Failure Handling
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Solution Overview
Problem
In vehicles equipped with multiple motion control units, the lack of coordination between these units can lead to interference and failure of control actions, resulting in suboptimal performance or unexpected behavior when one unit fails, such as the rear wheel toe angle control unit.
Innovation Solution
A vehicle motion control system that enables coordinated operation among multiple units by exchanging coordination control signals, with a failure detection unit that stores and maintains these signals to ensure continued coordinated operation even if one unit fails, preventing unexpected vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple vehicle motion control units are operated without coordination, then each unit can function independently, but the control actions of different units interfere with each other and cannot provide required control performance
Solution Approach 1:
A coordination control signal storage device is introduced as an intermediary component between multiple vehicle motion control units. This storage device receives and stores coordination control signals from one control unit and provides them to other control units, enabling coordinated operation without direct complex communication between all units. The intermediary resolves the contradiction by maintaining independent unit operation while ensuring coordinated control performance through the mediating storage device.
2Reliability
If coordination control signals are exchanged between control units, then control actions are properly coordinated, but the system becomes vulnerable to failures when a control unit malfunctions
Solution Approach 1:
The coordination control signal storage device stores coordination control signals in advance before failures occur. When a control unit malfunctions, the stored signals are already available for other control units to continue coordinated operation. This preliminary storage action resolves the contradiction by ensuring coordinated control operation is maintained even when adaptability to failure is needed.
Solution Approach 2:
The system prepares backup coordination control signals in advance and stores them in the storage device, creating a cushion against potential failures. When a control unit fails, this pre-prepared cushion of stored signals allows the system to maintain coordinated operation without immediate disruption. The beforehand cushioning resolves the contradiction by protecting coordinated control operation against failures before they impact system performance.
3Object-affected harmful factors
If a control unit fails and shuts off power, then the failed unit stops causing interference, but other units cannot receive coordination control signals and unable to operate as designed
Solution Approach 1:
The coordination control signal storage device creates a copy of the coordination control signals and stores them independently of the original control unit. When a control unit fails and shuts off power, the copied signals remain intact in the storage device, allowing other control units to continue receiving and using the coordination signals. This copying resolves the contradiction by separating the signal storage from the potentially failing control unit, eliminating interference while maintaining continued operation.
Data Source
AI summary
Provided is a vehicle motion control system that comprises a plurality of vehicle behavior control units that are controlled in a mutually coordinated manner, and is configured to operate as designed even when one of the vehicle motion control units should fail. If a RTC-ECU (61) has ceased a control action thereof owing to a failure thereof, a VSA-ECU (31) retains the last received coordination control signal from the RTC-ECU in EEPROM (37) so that the VSA-ECU (31) is enabled to continue the coordinated control according to the retained coordination control signal. At the same time, the VSA-ECU (31) transmits the coordination control signal retained in the EEPROM onto a CAN so that the transmitted coordination control signal may be used by other ECUS of other vehicle behavior control units such as an ATTS-ECU (41) and a STG-ECU (51). In this manner, the behavior of the vehicle may be optimized by the coordination control of the VSA unit and other vehicle behavior control units.