Hybrid Vehicle Control Device Quiet Engine Start Mode
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Solution Overview
Problem
Conventional hybrid vehicles generate uncomfortable noise and vibration during engine start in quiet cabin environments, particularly when stopped in drive range with the brake depressed, due to the selection of starter motor-based engine start modes.
Innovation Solution
A hybrid vehicle control device that includes an engine start control system with two modes: a normal start mode prioritizing drive force response and a sound and vibration prioritizing startup mode, which is selected when the drive range is selected and the required driving force is small, using the motor as an engine starter to engage the clutch and crank the engine, thereby reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an engine start mode using the starter motor is selected, then drive force response performance is improved, but noise and vibration increase in quiet cabin environments
Solution Approach 1:
The patent applies dynamics by making the engine start mode selectable and adaptable based on real-time driving conditions. The control device dynamically switches between starter motor-based normal start mode and power motor-based quiet start mode according to the selected range position and brake operation state, optimizing the balance between drive force response and noise/vibration reduction for different operational scenarios
Solution Approach 2:
The patent changes the operational parameters of the engine start system by introducing multiple start modes with different characteristics. By adjusting the selection criteria based on range position (P, N, D, R) and brake operation state, the system varies the start mode parameters to achieve either rapid response or quiet operation depending on the required driving force and environmental conditions
2Object-affected harmful factors
If a sound and vibration prioritizing startup mode is selected, then noise and vibration are reduced, but drive force response performance decreases
Solution Approach 1:
The system dynamically adjusts the engine start characteristics by switching between quiet start mode and normal start mode based on real-time conditions. When the drive range is selected and brake is depressed (indicating low required driving force), the quiet start mode is activated to reduce noise and vibration. When other conditions prevail, the system reverts to normal start mode to ensure adequate drive force response
3Object-affected harmful factors
If the drive range is selected with brake depressed, then the vehicle is in a low required driving force state, but conventional systems still use noisy starter motor start mode
Solution Approach 1:
The control device uses feedback from the range position selection and brake operation state to determine the appropriate engine start mode. The system continuously monitors these inputs and adjusts the start mode selection accordingly, creating a closed-loop control system that adapts to the driver's intent and vehicle state to optimize both noise reduction and drive force requirements
Solution Approach 2:
The patent changes the selection parameters for engine start mode from conventional单一 criteria to a multi-parameter decision system. By incorporating both range position (P, N, D, R) and brake operation state into the selection logic, the system expands its adaptability to recognize low required driving force conditions and appropriately select quiet start mode
Data Source
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AI summary
The present invention achieves quiet engine startup wherein the generation of noise and vibration is suppressed when a drive range is selected and when demand for drive force is low. An FF hybrid vehicle provided with a hybrid control module (81) that begins engagement of a first clutch (3), and cranks a transverse engine (2) using a motor/generator (4) as a drive source, when a request is made to start an engine in an EV mode. The hybrid control module (81) has, as engine startup modes, a "normal start mode" that prioritizes drive force response performance and a "sound and vibration prioritizing startup mode" that prioritizes sound and vibration reduction performance. If a drive range is selected and demand for drive force is low when an engine startup request is made, the "sound and vibration prioritizing startup mode" is selected, and the transverse engine (2) is started.