Hybrid Vehicle Parking Assist Engine Control for Power Stability
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Solution Overview
Problem
Hybrid vehicles face accuracy issues during parking assist operations due to variations in driving power caused by engine start and stop cycles, especially when transitioning between EV and HV modes, leading to potential misalignment at the target parking position.
Innovation Solution
A vehicle control apparatus that dynamically manages the engine state based on battery charge thresholds, ensuring the engine remains in a stable state during parking assist operations by starting or stopping it as necessary to maintain consistent driving power, thereby preventing power variations that could affect parking accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is started to charge the battery when SOC is below the threshold, then the battery is charged, but the driving power varies due to engine torque fluctuations
Solution Approach 1:
The control device starts or stops the engine in advance before the parking assist operation begins, based on predicted SOC changes during the operation. This preliminary action ensures the engine remains in a stable state throughout the parking assist operation, preventing torque fluctuations that would otherwise occur if the engine started during movement.
Solution Approach 2:
The system dynamically adjusts engine operation state based on real-time SOC levels and predicted consumption during parking assist. The control device continuously monitors SOC and makes adaptive decisions about engine start/stop timing, transitioning from static threshold-based control to dynamic predictive control that accounts for operation duration and power consumption patterns.
2Use of energy by moving object
If the engine start/stop control is performed without considering parking assist operation timing, then the battery charge management is optimized, but the parking accuracy deteriorates
Solution Approach 1:
The control device merges the battery charge management function with the parking assist control function by integrating SOC monitoring and engine control logic into the parking assist control system. This combination allows simultaneous optimization of both battery management and parking accuracy through coordinated control decisions.
Solution Approach 2:
The system implements feedback control by continuously monitoring actual SOC levels during parking assist operation and comparing them against predicted values. Based on this feedback, the control device adjusts engine operation decisions to maintain both adequate charge levels and stable driving power throughout the parking maneuver.
3Reliability
If the engine is kept in stopping state to maintain stable driving power, then the parking accuracy is improved, but the battery may not have sufficient charge to complete the parking operation
Solution Approach 1:
The control device performs preliminary SOC assessment before initiating parking assist operation to predict whether the battery will have sufficient charge by the time parking is completed. Based on this prediction, it decides in advance whether to start the engine before the operation begins, ensuring both adequate charge levels and stable power delivery throughout the maneuver.
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 solution enables hybrid vehicles to be parked with high accuracy by maintaining consistent driving power through controlled engine management, reducing the likelihood of misalignment and improving overall parking precision.
Implementation Method 1
the rotating electrical machine is capable of being driven by using an output of the engine to charge an electric power storage
Data Source
AI summary
A vehicle control apparatus including an assisting device for performing a parking assist operation and a controlling device for performing a first control operation that controls charging an electric power storage by using an output of an engine if an amount of the stored electric power is smaller than a first threshold value. The controlling device performs a second control operation for putting the engine into a stopping state before a moving start time at which the vehicle starts to move after an assist start time and forbidding the engine from being started after the moving start time if the amount of the stored electric power at a timing before the moving start time is larger than a second threshold value.