Hybrid Vehicle Control Device for Simultaneous Engine Startup and Downshift
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Solution Overview
Problem
Conventional hybrid vehicle control devices experience unsatisfactory shock and lag performance when simultaneously processing engine startup control and downshift control due to insufficient motor torque during cranking, leading to inadequate drive force transmission.
Innovation Solution
The control device determines scenarios based on whether sufficient motor torque is assured for cranking, performing downshift control in parallel with engine startup in scenarios with sufficient torque and prohibiting downshift control during cranking in scenarios with insufficient torque, ensuring satisfactory shock and lag performance by selecting between first and second simultaneous process controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If engine startup control is performed first followed by downshift control after clutch synchronization determination, then shock performance is improved, but lag performance deteriorates due to suspended downshift control during cranking
Solution Approach 1:
The patent dynamically adjusts the control sequence based on real-time determination of motor torque sufficiency. When motor torque is sufficient, downshift control proceeds in parallel with engine startup control without suspension, minimizing lag. When motor torque is insufficient, downshift control is suspended to prevent shock, then resumed after engine startup completion. This dynamic adaptation resolves the contradiction between shock performance and lag performance.
2Loss of time
If downshift control is performed in parallel with engine startup control, then lag performance is improved, but shock performance deteriorates due to insufficient motor torque during cranking
Solution Approach 1:
The control device incorporates a determination mechanism that assesses whether sufficient motor torque is available for cranking before initiating simultaneous downshift and engine startup control. This feedback loop ensures that parallel control is only executed when torque conditions are adequate, preventing shock while maintaining responsive lag performance. The system continuously monitors torque sufficiency and adjusts control strategy accordingly.
3Device complexity
If a single simultaneous processing pattern is fixed, then device complexity is reduced, but adaptability deteriorates as some scenarios achieve satisfactory performance while others do not
Solution Approach 1:
The patent segments the simultaneous processing into two distinct control patterns: Pattern 1 for scenarios where motor torque is sufficient (parallel downshift and startup control), and Pattern 2 for scenarios where motor torque is insufficient (sequential control with downshift suspension during cranking). The control device determines which pattern to apply based on real-time torque assessment, achieving high scenario adaptability while maintaining manageable complexity through clear pattern differentiation.
Data Source
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AI summary
To afford satisfactory shock performance and lag performance in any scenario, during simultaneous processing of engine startup control and downshift control while driving. A FR hybrid vehicle control device is provided with an engine Eng, a motor/generator MG, a first clutch CL1, an automatic transmission AT, a second clutch CL2, and simultaneous process selection control means (Fig. 6). The simultaneous process selection control means (Fig. 6) performs engine startup control and downshift control in parallel in cases where the torque outputtabte by the motor subsequent to downshifting during overlap of an engine startup request and a downshift request is equal to or greater than the engine startup torque, or performs engine startup control first then downshift control in cases where the torque outputtabte by the motor subsequent to downshifting is less than the engine startup torque.