Eco-Vehicle Coasting Control via Road Gradient and Motor Torque
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Solution Overview
Problem
Conventional coasting guidance systems for eco-friendly vehicles lack accuracy and reliability, are complex, and require extensive mapping and testing, limiting their ability to maximize fuel efficiency and driving distance due to inadequate consideration of road gradients and deceleration events.
Innovation Solution
A coasting control method that uses a vehicle controller to determine target vehicle speed based on road gradient information, adjust deceleration using motor torque, and provide coasting guidance to drivers, simplifying control logic and enhancing mapping efficiency while ensuring accurate and reliable control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional coasting guidance systems are implemented, then fuel efficiency can be improved, but the system complexity and mapping requirements increase significantly
Solution Approach 1:
The patent extracts and eliminates unnecessary complex control logic and mapping requirements from conventional coasting guidance systems. By simplifying the control algorithm to focus only on essential parameters (vehicle speed, acceleration pedal position, and basic road gradient), the system maintains fuel efficiency benefits while removing excessive complexity that burdens the control system and mapping processes.
Solution Approach 2:
The patent adopts a simpler, more pragmatic approach to coasting control that does not require extensive, long-term mapping and testing. The simplified system can be deployed with basic initial configurations and adapted through normal operation, eliminating the need for complex, resource-intensive mapping processes that conventional systems require.
2Use of energy by moving object
If conventional coasting guidance systems are implemented, then fuel efficiency can be improved, but extensive mapping and testing are required
Solution Approach 1:
The patent performs necessary preliminary actions minimally by using basic road gradient information that is already available or easily obtainable, rather than requiring extensive pre-mapping and testing. The system is designed to function effectively with minimal initial configuration, reducing the time investment required before deployment.
Solution Approach 2:
The simplified coasting control system can adapt and optimize its performance through normal vehicle operation without requiring extensive external mapping and testing. The system serves itself by learning from actual driving conditions and adjusting accordingly, eliminating the need for prolonged external calibration processes.
3Measurement precision
If road gradient information is considered in coasting control, then control accuracy is improved, but system complexity increases
Solution Approach 1:
The patent leverages road gradient information that can be obtained through multiple existing systems (GPS, inertial sensors, or pre-stored map data), allowing the same information source to serve both navigation and coasting control functions. This universal approach improves control accuracy without adding dedicated complex subsystems.
Solution Approach 2:
The patent uses road gradient as a key parameter to dynamically adjust coasting control strategies. By changing the control parameters based on detected road gradient conditions, the system achieves higher accuracy in predicting optimal coasting behavior without fundamentally increasing system complexity.
4Manufacturing precision
If motor torque is adjusted for deceleration control, then coasting precision is improved, but control complexity increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring actual vehicle deceleration and comparing it with target deceleration values. The motor torque is adjusted based on this feedback to maintain precise deceleration control, achieving high precision through a relatively simple closed-loop control mechanism rather than complex open-loop scheduling.
Solution Approach 2:
The patent replaces complex mechanical deceleration control mechanisms with electronic motor torque control. By using the electric motor to provide precise deceleration force, the system achieves high deceleration precision while simplifying the overall control architecture compared to traditional mechanical approaches.
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
The method improves fuel efficiency and driving distance by accurately controlling coasting deceleration based on road gradients, reducing the need for extensive mapping and testing, and enhancing the reliability of coasting guidance.
Implementation Method 1
a motor that receives kinetic energy of a vehicle operates as a generator to recharge a battery connected to the motor through an inverter
Implementation Method 2
the inverter converts direct current (DC) of the battery into 3-phase alternating current (AC) and applies the converted current to the motor
Data Source
AI summary
A coasting control method of an eco-friendly vehicle includes steps of acquiring deceleration event information and road gradient information in front of a vehicle during driving, by a controller in the vehicle, determining target vehicle speed in a deceleration event in consideration of road gradient based on the deceleration event information and the road gradient information, by the controller, determining expected vehicle speed while the vehicle is decelerated in a coasting state, based on current vehicle speed, by the controller, determining a start location for starting coasting based on target vehicle speed in consideration of current vehicle speed of the vehicle and the road gradient and expected vehicle speed at a target location as a deceleration event location, by the controller, and operating an information provider for coasting guidance and coasting induction to a driver at a start location, by the controller.