Vehicle Behavior Control Device with Segmented Command Units
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Solution Overview
Problem
Existing vehicle behavior control systems face performance deterioration when an abnormality occurs in the command unit, leading to inefficient and unstable operation of multiple vehicle behavior controls such as braking force control and front-rear driving force distribution.
Innovation Solution
A vehicle behavior control device with an operating state detection means, vehicle state detection means, and adjustment means that calculates and allocates control quantities among vehicle behavior control means, allowing each control to share and correct target values based on driver and vehicle conditions, ensuring integrated and efficient operation even during abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple vehicle behavior control means are integrated into a single command unit, then the integrated operation and efficiency of vehicle controls is improved, but the reliability deteriorates when an abnormality occurs in the command unit
Solution Approach 1:
The patent divides the vehicle behavior control system into independent control means (first vehicle behavior control means and second vehicle behavior control means), each capable of operating autonomously. This segmentation ensures that if one control means experiences an abnormality, the other can continue to function, thereby maintaining system reliability while achieving integrated operation through their coordinated actions on the same actuators.
2Device complexity
If a single command unit controls all vehicle behavior controls, then the device complexity is reduced, but the reliability worsens when abnormalities occur
Solution Approach 1:
The control system is segmented into multiple independent control means, each with its own control unit. This segmentation increases structural complexity but enhances reliability by ensuring that abnormalities in one control unit do not propagate to others, allowing the system to maintain functionality through redundant independent control paths.
3Reliability
If vehicle behavior control means operate independently without coordination, then the reliability is maintained during abnormalities, but the efficiency and integrated operation deteriorates
Solution Approach 1:
Multiple independent vehicle behavior control means are merged in their operation by coordinating their control of the same actuators. The system integrates their functions through shared actuator control, allowing them to work together efficiently while maintaining independence in their control logic, thus achieving both integrated operation and reliability during abnormalities.
Solution Approach 2:
The system employs feedback mechanisms where each control unit monitors the operating states of actuators and adjusts its control commands accordingly. This feedback enables coordinated operation among independent control means, improving overall efficiency while maintaining the ability to operate independently when abnormalities occur in other control units.
Data Source
AI summary
An adjustment unit identifies a front-rear driving force distribution control unit and a braking force control unit, and calculates based on the current vehicle state, a target yaw moment required for each of the front-rear driving force distribution control unit and braking force control unit. Then, based on the current operating state of each of the control units, a control correction value for each unit is calculated in consideration of the maximum value, and outputted.