Hybrid Vehicle Engine Speed Control for Sport Mode Response
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Solution Overview
Problem
In hybrid vehicles performing series driving, the sport mode often results in an excessively high driver requesting output upon sudden accelerator opening, leading to difficulties in matching engine output and reducing acceleration response, especially when the engine rotational speed is initially set low to suppress noise and vibration.
Innovation Solution
The hybrid vehicle incorporates a controller that sets a higher first minimum rotational speed of the engine in sport mode compared to normal mode during series driving, allowing for quicker engine rotational speed increase when the accelerator is applied, thereby enhancing acceleration response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the engine minimum rotational speed is set low to suppress noise and vibration in normal mode, then quietness performance is improved, but acceleration response deteriorates when sudden accelerator input is required
Solution Approach 1:
The patent applies dynamics by making the engine minimum rotational speed variable based on driving mode. In normal mode, the minimum rotational speed is set low to suppress noise and vibration. In sport mode, the minimum rotational speed is set high to improve acceleration response. This dynamic adjustment of operational parameters allows the system to optimize for different performance requirements.
Solution Approach 2:
The patent changes the operational parameter of engine minimum rotational speed according to the selected driving mode. By switching between different minimum rotational speed values (low for normal mode, high for sport mode), the system can simultaneously achieve quiet operation during cruising and rapid acceleration response when needed.
2Speed
If the driver requesting output is set high in sport mode to enhance acceleration response, then acceleration performance is improved, but it becomes difficult to match actual engine output to driver requesting output
Solution Approach 1:
The patent applies preliminary action by pre-setting the engine minimum rotational speed to a higher value in sport mode before accelerator input is given. This prepares the engine to respond more quickly and accurately to driver requests, reducing the time lag and improving the matching between driver requesting output and actual engine output.
Data Source
AI summary
The disclosed hybrid vehicle (1) is a hybrid vehicle (1) including an engine (2), a motor (3), a generator (4), and a controller (10) that controls an operating state of at least the engine (2), and performs series driving in which driving force from the motor (3) drives the vehicle while driving force from the engine (2) causes the generator (4) to generate electric power. The hybrid vehicle (1) has a normal mode in which a driver requesting output is set according to an accelerator opening degree and a sport mode in which the driver requesting output is set to be equal to or higher than the driver requesting output set in the normal mode according to the accelerator opening degree. The controller (10) sets a first minimum rotational speed (ω1) of the engine (2) in the sport mode higher than a second minimum rotational speed (ω2) of the engine (2) in the normal mode during series driving.