Hybrid Vehicle Control Device Mode Switch Downshift Response
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Solution Overview
Problem
Conventional hybrid vehicle control devices experience delays in transmission response when a mode switch request and a downshift request are generated simultaneously, as transmission control is initiated only after engine start is completed, without considering the transmission speed.
Innovation Solution
A hybrid vehicle control device that starts downshift control once the engine rotation speed reaches a combustion possible rotational speed, with a faster transmission speed during combined mode switch and downshift requests compared to solo downshift requests, to expedite the completion of downshift control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission control is started after engine start is completed, then engine reliability is ensured, but transmission response time is delayed
Solution Approach 1:
The control device starts transmission control in advance during engine startup (cranking phase) rather than waiting for engine start completion. The transmission ratio is adjusted preliminarily based on predicted engine output, so that when the engine actually starts, the transmission is already in or near the optimal gear position, reducing overall response time while ensuring the engine completes startup reliably
Solution Approach 2:
The transmission control strategy dynamically adapts based on engine startup status. The control device determines whether the engine is cranking or has started, and adjusts transmission ratio accordingly - using faster downshifting during cranking phase and normal control after startup, creating a dynamic, stage-based control system that optimizes both reliability and response time
2Loss of time
If transmission speed is increased during combined mode switch and downshift requests, then transmission response time is reduced, but control complexity increases
Solution Approach 1:
The control device segments the downshift control process into distinct phases based on engine status (cranking phase vs. post-startup phase). Each phase has predetermined transmission ratio adjustment strategies, simplifying the control logic by breaking down the complex combined mode switch and downshift request into manageable, stage-specific control actions with clear decision boundaries
Data Source
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AI summary
The purpose of the present invention is to provide a hybrid vehicle control device with which it is possible to prevent a delay in transmission response if a mode switch request and a downshift request have been generated. Provided is a hybrid vehicle control device, in which an engine (2), a motor (4), and an automatic transmission (6) are provided to a drive system, and in which when there is a mode switch request during an EV mode where only the motor (4) is a drive source, a shift is made to an HEV mode where the engine (2) and the motor (4) are drive sources, wherein if a mode switch request and a downshift request for the automatic transmission (6) are generated, mode switch control is immediately started first. The configuration is also such that downshift control is started once the rotational speed of the engine (2) has reached a combustion possible rotational speed, and the transmission speed at this time is made to be faster than an ordinary transmission speed.