ISG-Auto Hold Engine Restart Control via Pedal Dynamics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ISG-Auto Hold systems in vehicles fail to allow instantaneous engine restart when the driver slightly engages and immediately releases the accelerator pedal, leading to driver discomfort and increased accident risk due to unexpected vehicle movement.
Innovation Solution
A method and apparatus that enable the vehicle to enter an ISG state and actuate the Auto Hold, determining conditions for releasing the Auto Hold and ISG, and restarting the engine when the accelerator pedal is slightly engaged and then released, using a controller to sense vehicle speed, gear shift, and pedal operations to manage the restart process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the ISG system forces the engine to turn off when the Auto Hold is turned on or when the accelerator pedal opening rate is 0%, then fuel efficiency is improved, but the driver cannot perform instantaneous control when slightly engaging and releasing the accelerator pedal
Solution Approach 1:
The patent introduces dynamic judgment of accelerator pedal engagement state by detecting both the opening rate and opening duration. The system dynamically adjusts engine restart behavior based on whether the pedal engagement exceeds a threshold duration, allowing the control strategy to adapt between fuel-saving mode (brief engagement) and instantaneous control mode (sustained engagement), thereby resolving the contradiction between energy efficiency and operational responsiveness
Solution Approach 2:
The patent changes the control parameters from a simple binary state (accelerator pedal engaged/not engaged) to a multi-parameter judgment system that considers both the opening rate and opening duration of the accelerator pedal. This parameter transformation enables the system to distinguish between intentional drive requests and transient movements, allowing selective engine restart that improves both fuel efficiency and driver control capability
2Ease of operation
If the ISG maintains the engine turned on when the Auto Hold is turned on, then instantaneous control is enabled, but fuel efficiency deteriorates
Solution Approach 1:
The patent transforms the engine control decision from a static maintenance mode to a dynamic parameter-based judgment system. By monitoring both the accelerator pedal opening rate and its duration, the system determines whether to maintain or shut off the engine, enabling selective application of instantaneous control only when truly needed while preserving fuel efficiency during routine stops
Solution Approach 2:
The system implements dynamic engine management where the engine state (on/off) is continuously adjusted based on real-time detection of driver intent through accelerator pedal behavior analysis. This dynamic approach allows the system to switch between maintaining engine operation for instantaneous control and shutting off for fuel savings, depending on the detected driving scenario
3Loss of energy
If the engine is forced to turn off when the accelerator pedal opening rate is 0%, then fuel efficiency is improved, but the driver's intention to drive may not be responded to instantly
Solution Approach 1:
The patent enhances the detection parameters from merely checking if the accelerator pedal opening rate is greater than zero to a dual-parameter system that also measures the duration of pedal engagement. This refined parameter detection enables the system to reliably distinguish between genuine drive intentions (sustained engagement) and transient movements (brief engagement), improving both the accuracy of driver intent recognition and the reliability of the response
Solution Approach 2:
The system implements feedback through continuous monitoring of accelerator pedal state and using this information to adjust engine control decisions. By feeding back the pedal engagement duration and rate information to the control unit, the system can make informed decisions about whether to restart the engine, ensuring reliable response to genuine driver intentions while avoiding unnecessary engine operations
Data Source
AI summary
A method for controlling restart of a vehicle is provided. The method includes allowing the vehicle to enter into an ISG state and allowing the vehicle to actuate the Auto Hold. Whether the vehicle fulfills a condition for releasing the Auto Hold is then determined and operation of the Auto Hold is released in response to determining that the vehicle fulfills the condition for releasing the Auto Hold. Additionally, the method includes determining whether the vehicle fulfills a condition for releasing the ISG and releasing the ISG and restarting an engine in response to determining that the vehicle fulfills the condition for releasing the ISG.