Dynamic Creep Torque Control for Hybrid Vehicles
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Solution Overview
Problem
Conventional creep torque control in hybrid electric vehicles is not adaptable to driver tendencies, leading to inefficient fuel usage due to unwanted extra creep torque generation, especially during downhill driving, uphill driving, and in congested road conditions, where frequent brake operation occurs.
Innovation Solution
A method and apparatus that dynamically adjust the creep torque map by calculating a derating factor based on brake pedal position and vehicle speed conditions, allowing for real-time correction of creep torque output to match driver preferences, thereby preventing frequent brake pedal operation and improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed predetermined creep torque map is used for creep driving, then the vehicle can maintain basic creep driving function, but the creep torque does not adapt to driver tendencies causing frequent brake operation and fuel inefficiency
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed predetermined creep torque map to a dynamically adjustable creep torque map. The controller modifies the creep torque map in real-time based on brake operation detection, allowing the system to adapt to driver tendencies and reduce energy loss through unnecessary braking.
Solution Approach 2:
The patent implements feedback by detecting brake operation status and using this information to adjust the creep torque map. The controller continuously monitors brake pedal position and creep driving state, then modifies torque output accordingly, creating a closed-loop system that responds to driver behavior and improves fuel efficiency.
2Force
If high creep torque is generated to ensure sufficient driving force, then the vehicle can overcome loads effectively, but unwanted extra creep torque is produced causing frequent brake operation and heat energy loss
Solution Approach 1:
The patent applies parameter changes by modifying the creep torque map parameters based on detected brake operation. When brake operation is detected during creep driving, the controller adjusts the torque parameters to reduce unwanted extra creep torque, thereby eliminating the harmful effect of excessive force generation.
Solution Approach 2:
The patent implements preliminary anti-action by detecting brake operation in advance and proactively adjusting the creep torque map to prevent unwanted extra torque generation. This anticipatory adjustment stops the harmful effect before it occurs, rather than reacting after the problem arises.
3Adaptability or versatility
If the creep torque map is adjusted frequently to match driver tendencies, then the system becomes highly adaptive, but the control system complexity increases
Solution Approach 1:
The patent applies local quality by making adjustments only to the creep torque map parameters relevant to detected brake operation conditions, rather than overhauling the entire control system. This localized modification approach maintains adaptability while minimizing the increase in system complexity.
Data Source
AI summary
A method of controlling a creep torque of a vehicle includes: determining whether the vehicle is in a creep driving state based on an accelerator pedal position value; determining whether a vehicle speed is greater than a set vehicle speed; determining at a first time whether a deceleration condition is satisfied when the vehicle speed is greater than the set vehicle speed; when the deceleration condition is satisfied at the first time, storing a first time at which the deceleration condition is satisfied and determining whether a deceleration release condition is satisfied; when it is determined that the deceleration release condition is satisfied, determining at a second time whether the deceleration condition is satisfied; and when it is determined that the deceleration condition is satisfied at the second time, storing the second time at which the deceleration condition is satisfied.