Inertia Drive Torque Sharing for Eco-Friendly Vehicle Deceleration
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Solution Overview
Problem
Conventional inertia drive control in eco-friendly vehicles is limited by relying solely on motor control, lacking hydraulic braking, which reduces reliability and usability, especially in autonomous vehicle applications, and restricts fuel efficiency improvements.
Innovation Solution
Implementing inertia drive cooperative control that shares torque between motor and hydraulic braking, allowing for deceleration through both motor torque and hydraulic braking torque, enhancing control accuracy and reliability, and extending the deceleration control area suitable for autonomous vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If motor-only control is used for inertia drive, then device complexity is reduced, but reliability and control accuracy deteriorate
Solution Approach 1:
The patent combines motor control and hydraulic braking control into a unified inertia drive control system. The controller integrates both motor torque control and hydraulic braking torque control to perform coordinated deceleration, merging two separate control systems into one comprehensive solution that improves reliability while managing complexity.
2Device complexity
If motor-only control is used for inertia drive, then control system simplicity is maintained, but fuel efficiency improvement is limited
Solution Approach 1:
The patent applies partial action by selectively using motor control for certain deceleration scenarios and hydraulic braking control for others. The system determines whether to use motor-only control or combined control based on driving conditions, battery state, and deceleration requirements, allowing flexible optimization of fuel efficiency without requiring complex control structures in all situations.
3Reliability
If hydraulic braking is added to inertia drive control, then control accuracy and reliability improve, but device complexity increases
Solution Approach 1:
The controller is designed with multi-functionality to handle both motor control and hydraulic braking control within a single control unit. This universal controller can operate in multiple modes: motor-only control mode and combined control mode, reducing the need for separate dedicated control systems and managing complexity while maintaining reliability improvements.
4Use of energy by moving object
If motor utilization is maximized, then energy recovery increases, but deceleration control range is restricted
Solution Approach 1:
The patent implements dynamic control by continuously adjusting the balance between motor torque and hydraulic braking torque based on real-time driving conditions, battery state of charge, and deceleration requirements. This dynamic allocation allows the system to maximize energy recovery when conditions are favorable while expanding control range to various deceleration scenarios by switching between motor-only and combined control modes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves fuel efficiency, increases driver reliability, and expands the deceleration control area, making it suitable for autonomous vehicle infrastructure by effectively utilizing hydraulic pressure for precise control.
Implementation Method 1
controls a motor torque (that is a negative torque) to perform deceleration of the vehicle
Implementation Method 2
hydraulic braking control by a hydraulic braking torque
Data Source
AI summary
A method for inertia drive control with torque sharing of an eco-friendly vehicle includes when an event in which the eco-friendly vehicle being decelerated with the inertia drive control is detected; calculating, by a controller, a distance variable and a speed variable according to the event; calculating, by the controller, a deceleration torque, which is required for an inertia drive of the eco-friendly vehicle, by dividing into a motor torque and a hydraulic braking torque; and performing, by the controller, inertia drive cooperative control in which the deceleration is performed without driver intervention with motor control through the motor torque and hydraulic braking control through hydraulic braking torque.