Hybrid Vehicle Start Clutch Engagement Control
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Solution Overview
Problem
Conventional devices for electrically driven vehicles experience starting shock and delay due to the need to re-engage the dog clutch when switching from neutral to starting gear, as the electric motor and hydraulic pressure pump are stopped, leading to an inefficient starting process.
Innovation Solution
A starting control system that maintains the engagement of the start clutch when the vehicle is stopped, using a multistage gear transmission with engagement clutches, allowing for immediate response to starting requests without the need for re-engagement, thus reducing starting shock and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electric motor and hydraulic pressure pump are stopped when the vehicle is stopped, then energy consumption is reduced, but the starting response time increases and starting shock cannot be avoided
Solution Approach 1:
The start clutch is engaged in advance when the vehicle stops, maintaining the transmission in a starting gear shift stage. This preliminary engagement eliminates the need for re-engagement during subsequent starting operations, reducing starting response time while allowing the motor and pump to remain stopped for energy savings.
Solution Approach 2:
The system dynamically maintains the start clutch engagement state during vehicle stops, transitioning between engaged and disengaged states based on vehicle operation conditions. This dynamic control allows the clutch to remain engaged during temporary stops (reducing start delay) while allowing disengagement during extended stops (reducing energy consumption).
2Use of energy by moving object
If the dog clutch is disengaged when the vehicle is stopped, then energy consumption is reduced, but starting shock occurs during the next starting operation
Solution Approach 1:
The start clutch is engaged in advance before the vehicle needs to start, preparing the transmission system for immediate power delivery. This preliminary engagement prevents the harmful effect of starting shock by ensuring the clutch is already in the engaged position when the driver requests starting.
3Loss of time
If the start clutch is engaged in advance, then starting response time is reduced, but the complexity of the control system increases
Solution Approach 1:
The control system automatically manages the start clutch engagement state based on vehicle operation conditions without requiring manual intervention. The system monitors vehicle stop conditions and autonomously maintains or releases clutch engagement, simplifying the control logic while achieving rapid starting response.
Data Source
AI summary
A drive system is provided with a first motor generator as a power source, and a multistage gear transmission for changing the speed of output from the first motor generator and transmitting the output to drive wheels. The multistage gear transmission has a plurality of engagement clutches as shifting elements that are meshingly engaged upon movement from a disengaged position. This hybrid vehicle is provided with a start control device where, when a start clutch has been engaged while the vehicle is stopped, the start control device maintains the engagement of the start clutch for a duration that includes when the vehicle is stopped and until the next vehicle start.