Hybrid Vehicle Drive Control System for Smooth Mode Transition
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Solution Overview
Problem
Existing hybrid vehicle drive control systems face challenges in smoothly shifting to an electric vehicle mode and reducing clutch engagement shocks, requiring complex control and potential delays in mode selection based on driving force, vehicle speed, and battery state of charge.
Innovation Solution
A drive control system with a controller that manages clutches to stop the engine and select the appropriate clutch engagement for smooth mode transitions, allowing the vehicle to operate in electric vehicle modes by engaging or disengaging specific clutches to transition from hybrid modes to electric vehicle modes, thereby reducing clutch engagement shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clutches are manipulated to switch operating modes in existing hybrid vehicles, then mode switching capability is achieved, but control complexity increases and engagement shocks occur
Solution Approach 1:
The control device determines the target operating mode in advance based on driving conditions (vehicle speed, accelerator opening, battery charge level) before executing clutch manipulation. This preliminary determination allows the system to plan the optimal clutch engagement sequence, reducing control complexity while maintaining versatile mode switching capability.
Solution Approach 2:
The clutch engagement process is segmented into distinct phases: determining target mode, selecting engagement sequence, controlling engagement timing, and managing power transmission routes. This segmentation of the control process reduces overall complexity by breaking down the complex multi-clutch coordination into manageable sequential steps.
2Adaptability or versatility
If multiple clutches are manipulated to switch operating modes in existing hybrid vehicles, then mode switching capability is achieved, but engagement shocks occur
Solution Approach 1:
The control device determines the optimal engagement sequence in advance, preparing the system for smooth transitions. By planning which clutch engages first and when, the system prevents sudden torque transfers that would cause engagement shocks, while still achieving the desired mode switching.
Solution Approach 2:
The control device manages power transmission routes before clutch engagement to cushion against potential shocks. By pre-positioning power flow paths and controlling engine torque delivery, the system mitigates the impact of clutch engagement on the drivetrain, eliminating harmful engagement shocks.
3Measurement precision
If complex control is used to select operating modes based on driving conditions, then mode selection accuracy is improved, but response time is delayed
Solution Approach 1:
The control device continuously monitors driving conditions (vehicle speed, accelerator opening, battery charge level) and determines the target operating mode in advance, before the driver actually requests a mode change. This preliminary determination ensures accurate mode selection based on current conditions while reducing the actual response time when switching is requested.
Solution Approach 2:
The control device autonomously determines the optimal operating mode based on pre-programmed criteria and real-time sensor data, without requiring complex real-time calculations or external input. This self-service approach maintains high selection accuracy while minimizing processing delays.
Data Source
AI summary
A drive control system for a hybrid vehicle is provided to shift an operating mode smoothly to an electric vehicle mode in which an engine is stopped. A controller is configured to select the electric vehicle mode to be established from the first electric vehicle mode and the second electric vehicle mode upon satisfaction of the determination to shift the operating mode to the electric vehicle mode, to select the clutch to be engaged from the first clutch and the second clutch to establish the selected electric vehicle mode, and to stop the engine while engaging the selected clutch.