Hybrid Vehicle Engine Speed Pre-Control for Smooth Power Demand
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Solution Overview
Problem
In automated driving hybrid vehicles, sudden increases in engine speed during increased driving force requirements lead to discomfort due to engine sound and vibration, affecting riding comfort.
Innovation Solution
A control method that gradually increases engine speed in predetermined steps until the required driving force is needed, and then decreases it in smaller steps when the force is no longer required, ensuring a smooth transition and minimizing occupant discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If engine speed is increased suddenly to increase power generation, then the required driving force is met, but engine sound and vibration increase suddenly causing occupant discomfort
Solution Approach 1:
The control device increases engine speed in advance before the required driving force actually needs to be increased. By predicting future power requirements and preparing the engine beforehand, the system can meet sudden power demands without sudden engine speed increases, thereby avoiding occupant discomfort from sudden noise and vibration changes.
Solution Approach 2:
The control device dynamically adjusts engine speed based on predicted future driving force requirements rather than responding statically to current demands. This dynamic approach allows the engine to operate at optimal speeds in advance, smoothing out transitions and reducing sudden changes in engine sound and vibration while still meeting power requirements when needed.
2Object-affected harmful factors
If engine speed is increased gradually to suppress sound and vibration changes, then riding comfort is improved, but the response time to meet required driving force increases
Solution Approach 1:
The control device performs preliminary action by increasing engine speed in advance based on predicted future requirements. This eliminates the time delay between power demand and engine response while still allowing gradual speed increases that suppress sudden noise and vibration changes, thus resolving both the comfort and response time concerns.
Solution Approach 2:
The system uses dynamic prediction and adjustment to optimize the timing and rate of engine speed changes. By continuously monitoring driving conditions and predicting future power needs, the control device can adjust engine speed at the optimal rate and timing, achieving both smooth transitions for comfort and timely response to power demands.
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 approach effectively suppresses sudden changes in engine sound and vibration, enhancing riding comfort by allowing the engine speed to increase and decrease gradually, thus reducing occupant discomfort during automated driving scenarios like overtaking.
Implementation Method 1
a generator which generates power by rotation of the engine
Data Source
AI summary
A hybrid vehicle, a control method therefor, and a storage medium which are capable of suppressing changes in an engine sound and vibration even when acceleration is performed at the time of increasing a required driving force are provided.In a hybrid vehicle capable of performing automated driving control for automatically controlling at least acceleration and deceleration of a vehicle, a rotational speed of the engine is gradually increased by a predetermined increase step while maintaining or decelerating a vehicle speed of the hybrid vehicle until an increase timing of a required driving force in a case where it is predicted that the required driving force is required to be increased while the automated driving control is performed, and at least the power generated by the generator is supplied to the motor at the increase timing of the required driving force.