Steering Control Device Suppressing Motor Interference
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Solution Overview
Problem
The integration of variable gear transmission and electrical power steering systems in vehicles often leads to mutual interference between their control systems, resulting in deteriorated operation sensitivity and increased moment of inertia, particularly when two electric motors are used, which can impair steering responsiveness, especially in larger vehicles.
Innovation Solution
A control device that calculates compensation command signals using mathematical models to reduce interference between the variable gear transmission and electrical power steering systems, by adjusting the target gear ratio and torque generated by each electric motor, thereby improving operation sensitivity and mitigating the effects of increased moment of inertia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independent electric motors are provided for variable gear transmission system and electrical power steering system, then the functionality and control flexibility are improved, but the moment of inertia increases and mutual interference occurs causing deterioration of operation sensitivity
Solution Approach 1:
The patent combines the control of two independent electric motors (VGTS motor and EPS motor) into a single integrated control device that processes steering operations and coordinates both motors simultaneously. This merging of control functions eliminates mutual interference while maintaining the functionality benefits of having two motors, thereby improving operation sensitivity without sacrificing control flexibility
Solution Approach 2:
The control device acts as an intermediary that receives steering operation signals and distributes coordinated control commands to both the VGTS motor and EPS motor. By introducing this intermediary control layer, the patent resolves the conflict between having independent motors and maintaining sensitive operation, as the intermediary coordinates their actions to prevent interference
2Adaptability or versatility
If variable gear transmission system is integrated with electrical power steering system, then the range for assisting vehicle travel is enlarged, but mutual interference between control systems occurs deteriorating operation sensitivity
Solution Approach 1:
The control device is designed with multi-functionality to handle both VGTS control and EPS control within a single system. This universal control approach allows the system to provide both variable gear transmission assistance and power steering assistance without creating mutual interference, thereby maintaining operation sensitivity while enlarging the range for assisting vehicle travel
3Adaptability or versatility
If two control systems are provided for common control subject (steering system), then the control coverage is improved, but the complexity of control increases causing mutual interference
Solution Approach 1:
The patent merges the two separate control systems into a single integrated control device that manages both VGTS and EPS functions. This consolidation reduces control system complexity by eliminating the need for separate independent control units, while still providing comprehensive control coverage through the unified device's ability to coordinate both motors based on steering operations
Data Source
AI summary
In a steering system having a variable gear transmission system and an electrical power steering system, respective compensation amounts for first and second electric motors are produced by a first mathematical model. The compensation amounts are added to command values (v1, v2) to generate final command signals (igref, ipref) to the respective electric motors. According to the above structure and operation, a mutual interference between two control systems can be suppressed.