Hybrid Vehicle Reverse Control with Fast Clutch Mode Switching
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Solution Overview
Problem
Hybrid vehicles with a P2 arrangement face a long switching time when transitioning from a vehicle-stopped electric power generation mode to an engine-powered reverse traveling mode due to the complexity of clutch state changes.
Innovation Solution
A hybrid vehicle control apparatus that includes a controller to switch between vehicle-stopped electric power generation, first reverse traveling, and second reverse traveling modes, optimizing clutch transitions by limiting simultaneous engagements and disengagements to reduce hydraulic pressure demands and enable swift mode changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If switching to the first reverse traveling mode (engine-powered) is performed from the vehicle-stopped electric power generation mode, then reverse traveling is achieved, but the switching time is long due to complex clutch state changes
Solution Approach 1:
The control device performs preliminary action by pre-positioning the clutch to a specific state during the vehicle-stopped electric power generation mode that enables faster transition to reverse traveling. The clutch is maintained in a state where only one clutch needs to be engaged for reverse traveling, rather than requiring multiple clutch engagements, thus reducing the switching time when reverse traveling is requested.
2Reliability
If multiple clutches are engaged simultaneously during mode switching, then the desired power transmission path is established, but the hydraulic pressure demand increases and switching time extends
Solution Approach 1:
The control device segments the clutch engagement process by controlling clutches to be engaged sequentially rather than simultaneously. During switching to reverse traveling mode, the control device engages clutches in a staged manner, ensuring that not all clutches are engaged at the same time. This segmentation reduces the peak hydraulic pressure demand and allows the hydraulic system to respond more quickly, thereby improving switching efficiency while maintaining reliable power transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus allows for rapid switching to electric motor-powered reverse traveling, reducing clutch engagement time and maintaining efficient fuel economy, even when the engine is running, without increasing the size or performance of the clutch switching device.
Implementation Method 1
an electric motor 6. The electric motor generates power to be outputted to the driving wheel
Implementation Method 2
a transmission 8. The transmission is positioned on a power transmission path between the electric motor 6 and the driving wheel 2
Implementation Method 3
a clutch. The clutch is configured to cut off the power transmission path between the engine and the electric motor
Data Source
AI summary
A hybrid vehicle control apparatus includes a controller. The controller is configured to switch an operation mode of a hybrid vehicle between a vehicle-stopped electric power generation mode, a first reverse traveling mode, and a second reverse traveling mode. The vehicle-stopped electric power generation mode is a mode in which electric power generation is performed, while the hybrid vehicle is stopped, by sending power of an engine to an electric motor. The first reverse traveling mode is a mode in which the reverse traveling is performed by the power of the engine. The second reverse traveling mode is a mode in which the reverse traveling is performed by power of the electric motor. The controller is configured to switch the operation mode to the second reverse traveling mode when switching from the vehicle-stopped electric power generation mode to the reverse traveling is requested.