Vehicle Drive Control Switching Between Limited Torque Requests
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Solution Overview
Problem
Existing vehicle control systems face challenges in achieving desired request torques due to the setting of upper limit values for multiple request torques, leading to unsatisfactory execution of operation requests from different driving assistance systems.
Innovation Solution
A driving control apparatus that includes a microprocessor to output and manage first and second target values with different upper limit settings, allowing control based on the first target value until reaching its limit, then switching to the second target value when necessary, ensuring seamless execution of operation requests from multiple systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an upper limit value is set for the request torque selected from multiple request torques, then the control stability is improved, but the desired request torque cannot be obtained
Solution Approach 1:
The patent applies dynamics by making the upper limit value changeable based on operational conditions. Instead of using a fixed upper limit, the system dynamically adjusts the upper limit value according to the vehicle state and driving conditions, allowing the control system to maintain stability when needed while achieving desired request torques when conditions permit.
Solution Approach 2:
The patent changes the parameter of the upper limit value from a static setting to a dynamic parameter that varies with vehicle speed, acceleration, and other operational conditions. This allows the system to adapt the upper limit to different driving scenarios, resolving the contradiction between maintaining control stability and achieving desired request torques.
2Device complexity
If a single request torque is selected from multiple request torques, then the device complexity is reduced, but the satisfaction of multiple operation requests deteriorates
Solution Approach 1:
The patent segments the request torque handling into multiple independent request torque values from different driving assistance systems, each with its own upper limit settings. Instead of selecting a single request torque, the system processes multiple request torques separately and applies appropriate upper limits to each, thereby reducing complexity while satisfying multiple operation requests.
Solution Approach 2:
The control system is designed to handle multiple types of request torques from different sources (accelerator pedal, automatic transmission, vehicle stability control, etc.) using a universal framework that applies upper limit values to each request type. This multi-functional approach allows the system to satisfy diverse operation requests without significantly increasing complexity.
3Stability of the object's composition
If the upper limit value is set lower than the desired request torque, then the control stability is maintained, but the productivity deteriorates
Solution Approach 1:
The system dynamically adjusts the upper limit value based on real-time vehicle conditions and operational context. When stability is prioritized, the upper limit remains lower; when productivity is needed and conditions permit, the upper limit increases to match the desired request torque, thereby resolving the contradiction between stability and productivity.
Solution Approach 2:
The control system periodically evaluates whether to maintain or increase the upper limit value based on changing vehicle conditions. This periodic adjustment allows the system to alternate between stability-focused and productivity-focused modes, optimizing both control stability and operation execution efficiency over time.
Data Source
AI summary
The driving control apparatus includes a microprocessor configured to output a first target value for controlling a predetermined operation of a moving object based on a first operation request, output a second target value for controlling the predetermined operation based on a second operation request, and execute the control based on the first and second target values. When the first target value before being limited to a first upper limit value is greater than the second target value and the second target value is greater than the first upper limit value set for the first target value, the microprocessor controls the predetermined operation based on the first target value until a control amount reaches the first upper limit value, and, after the control amount reaches the first upper limit value, controls the predetermined operation based on the second target value.