Coasting Drive Control for Hybrid Vehicles
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Solution Overview
Problem
Hybrid vehicles face challenges in precisely controlling coasting drives on downhill roads, leading to inefficient energy recovery and reduced fuel efficiency due to manual computation complexities in existing control systems.
Innovation Solution
A method for controlling coasting drives in environmentally friendly vehicles, which calculates coasting velocity and control torque based on target distances and gradients using a control unit, combining feed forward and feedback torque adjustments to optimize regenerative energy recovery and improve inertia drive precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual computation methods are used for coasting drive control, then device complexity is reduced, but manufacturing precision and control accuracy deteriorate
Solution Approach 1:
The patent replaces manual computation methods with an automated control unit that performs precise calculations of coasting velocity, control target velocity, and control torque. This substitution of mechanical/manual operations with automated computational systems resolves the contradiction by achieving high control precision through electronic control while maintaining relatively simple system architecture.
2Loss of energy
If regenerative braking is not utilized on downhill roads, then device complexity is reduced, but loss of energy increases
Solution Approach 1:
The patent implements a feedback control mechanism where the control unit continuously monitors vehicle velocity, compares it with target velocity, and adjusts control torque accordingly. This feedback system enables automatic regenerative energy recovery on downhill roads by determining when coasting conditions are met and when regenerative braking should be applied, resolving the contradiction between energy recovery and system complexity.
3Measurement precision
If coasting velocity is not calculated based on target coasting distance and gradient, then computation time is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent performs preliminary calculations of coasting velocity based on target coasting distance and gradient information before the vehicle actually enters the coasting phase. By pre-calculating these parameters using the control unit, the system avoids complex real-time computations during active coasting, thus achieving both high measurement precision and reduced computation time.
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 method enhances the precision of inertia drive control and maximizes regenerative energy recovery on downhill roads, contributing to improved fuel efficiency and reduced manual computation complexities.
Implementation Method 1
calculating, by a control unit, a coasting velocity of the environmentally friendly vehicle at a deceleration event point based on a target coasting distance up to the deceleration event point and a gradient at the deceleration event point
Implementation Method 2
a regenerative braking mode collecting braking and inertia energy while driving by braking or inertia of the vehicle
Data Source
AI summary
A method for controlling a coasting drive of an environmentally friendly vehicle includes: calculating a coasting velocity of the environmentally friendly vehicle at a deceleration event point based on a target coasting distance up to the deceleration event point and a gradient at the deceleration event point; calculating a control target velocity of the environmentally friendly vehicle based on a target velocity of the environmentally friendly vehicle at the deceleration event point and the calculated coasting velocity; and determining control torque to adjust a velocity of the environmentally friendly vehicle to the target velocity to be output to a powertrain of the environmentally friendly vehicle based on the calculated control target velocity.