Hybrid Engine Control Timing for Shift Shock Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid vehicles face challenges in coordinating engine control and transmission shifting control, leading to delayed engine start, reduced drivability, and increased risk of shifting and engine starting shocks due to concurrent implementation of these controls.
Innovation Solution
An engine control apparatus that adjusts the timing and method of engine control based on the operator's intention, allowing for concurrent implementation of engine and transmission controls while prioritizing the operator's requirements for drive force changes, thereby simplifying control and reducing shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the shifting control and engine control are implemented concurrently to improve acceleration performance, then the acceleration performance is improved, but the control complexity increases and the risk of shifting shock and engine starting shock increases
Solution Approach 1:
The control apparatus dynamically adjusts the implementation timing of engine control based on the transmission's shifting state. When the transmission is in a partially shifted or neutral state, the engine control is delayed until the shifting is substantially complete. When the transmission is in a fully shifted state, the engine control can be implemented concurrently with shifting control, thus adapting the control strategy to the real-time state of the system.
Solution Approach 2:
The control apparatus monitors the shifting state of the transmission (whether it is in a partially shifted state, neutral state, or fully shifted state) and uses this feedback information to determine the appropriate timing for implementing engine control. This feedback mechanism allows the system to make real-time decisions about whether to delay or proceed with engine control, thereby managing complexity and preventing shocks.
2Object-affected harmful factors
If the engine control is delayed until after the shifting control is completed to prevent shifting shock, then the shifting shock is reduced, but the engine output is delayed and the drivability deteriorates
Solution Approach 1:
The control apparatus dynamically determines the engine control timing based on the transmission's shifting state. Instead of always delaying engine control until shifting is complete, the system checks whether the transmission is in a partially shifted/neutral state or a fully shifted state. This dynamic decision-making allows the system to proceed with engine control earlier when safe, thereby reducing time loss while still preventing shocks when necessary.
Solution Approach 2:
The control apparatus changes the parameter of engine control timing based on the shifting state parameter. When the transmission is in a partially shifted or neutral state, the engine control timing is set to after shifting completion. When the transmission is in a fully shifted state, the engine control timing is advanced to allow concurrent implementation, thus changing the timing parameter adaptively to balance shock prevention and response time.
3Speed
If the engine control is implemented in a partially shifted or neutral state to improve response, then the response to operator intention is improved, but the torque balance of transmission rotary elements cannot be established and shocks increase
Solution Approach 1:
The control apparatus dynamically evaluates the transmission's shifting state before implementing engine control. It detects whether the transmission is in a partially shifted state, neutral state, or fully shifted state, and only permits engine control when the transmission is in a fully shifted state where torque balance can be established. This dynamic state-dependent control prevents shocks while maintaining appropriate response speed.
Solution Approach 2:
The control apparatus performs a preliminary check of the transmission's shifting state before initiating engine control. By determining in advance whether the transmission is in a suitable state (fully shifted) for engine control, the system avoids implementing engine control during unsuitable states (partially shifted or neutral), thereby preventing shocks while still enabling timely control when conditions are favorable.
Data Source
AI summary
An engine control apparatus for a vehicle provided with a drive system including an engine and a transmission portion which constitutes a part of a power transmitting path, the engine control including an engine control portion configured to change a timing of initiation or a method of a control of the engine according to contents of a requirement for implementing the control of the engine, when the control of the engine and a shifting control of said transmission portion are concurrently required to be implemented.