Hybrid Car Engine Start Vibration Control
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Solution Overview
Problem
Hybrid cars experience increased vehicle vibration when starting the engine with the shift position in a non-traveling position due to differing vibration transmission characteristics compared to traveling positions, leading to amplified vibrations.
Innovation Solution
A hybrid car configuration featuring an engine, first motor, second motor, planetary gear, and electronic control unit that controls the connection and disconnection of intermediate and driving shafts, and adjusts damping torque phases to manage engine start vibrations, using a disconnecting mechanism and electronic control unit to connect or disconnect shafts based on shift position, and adjusts damping torque to suppress vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the same damping control is performed when the engine is started with the shift position being the non-traveling position as when the shift position is the traveling position, then the vibration can be suppressed in the traveling position case, but the vibration is amplified in the non-traveling position case
Solution Approach 1:
The patent applies dynamics by making the damping control strategy adaptive based on the shift position. The control system dynamically adjusts the damping torque phase according to whether the vehicle is in traveling or non-traveling position, transforming a static control approach into a dynamic one that responds to operational conditions. This resolves the contradiction by enabling the system to adapt its damping characteristics to match the specific vibration transmission path active under each shift position.
Solution Approach 2:
The patent changes the parameter of damping torque phase based on shift position. When the shift position changes between traveling and non-traveling positions, the control system adjusts the phase of the damping torque accordingly. This parameter change allows the damping control to be optimized for each specific operational mode, preventing vibration amplification in non-traveling position while maintaining effectiveness in traveling position.
2Power
If the intermediate shaft and driving shaft are connected when the shift position is traveling position, then power transmission is enabled, but vibration transmission characteristics differ from non-traveling position causing amplified vibrations
Solution Approach 1:
The control system acts as an intermediary that mediates between the mechanical connection state and the damping control strategy. Based on the shift position detection, the control system introduces appropriate damping torque with adjusted phase to counteract the different vibration transmission characteristics. This intermediary control approach allows the system to maintain power transmission functionality while compensating for the adverse vibration effects caused by the connected shafts in traveling position.
3Ease of operation
If the disconnecting mechanism is controlled to connect or disconnect shafts based on shift position, then the transmission path is optimized, but the vibration transmission characteristics vary between traveling and non-traveling positions
Solution Approach 1:
The control system uses feedback from the shift position detection to adjust the damping torque phase. The system continuously monitors the shift position and provides appropriate damping control in response, creating a closed-loop control system. This feedback mechanism allows the system to adapt to the changing vibration transmission characteristics caused by different shaft connection states, optimizing both transmission path performance and vibration suppression.
Data Source
AI summary
A hybrid car includes an engine, a first motor, a second motor, a planetary gear, a disconnecting mechanism, and an electronic control unit. The electronic control unit is configured to control the engine and the first motor such that the first motor gives the engine a damping torque of the same phase as a pulsating component of a torque of the engine and the first motor starts the engine by cranking the engine when the engine is started with the shift position being the position for traveling. The electronic control unit is configured to control the engine and the first motor such that the first motor starts the engine by cranking the engine without the first motor giving the engine the damping torque of the same phase when the engine is started with the shift position being the position for non-traveling.