Vehicle Transmission Pump Priming Control Algorithm
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Solution Overview
Problem
Existing vehicle transmission pump control systems in start-stop technology require expensive pressure sensing devices and are not optimized for engine start-stop events, leading to harsh re-starts due to air entrapment and inefficient priming.
Innovation Solution
Control algorithms for start-stop vehicle transmission pumps that assess engine-off duration, vehicle performance conditions like acceleration and inclination to prime the pump on-demand without relying on pressure sensing devices, using a powertrain control circuit with prime assessment and prime-ready logic to ensure efficient priming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensing devices are added to control transmission pump priming, then pump priming accuracy is improved, but system cost and complexity increase
Solution Approach 1:
The transmission pump controller uses existing sensor data (from engine control module) and internal algorithms to automatically determine when priming is needed, without requiring additional pressure sensors. The system serves itself by utilizing available information resources to make priming decisions.
Solution Approach 2:
The invention introduces a control algorithm that acts as an intermediary between existing vehicle sensors and the transmission pump controller. This algorithm processes data about engine off-duration, vehicle performance conditions, and transmission pressure range to determine optimal priming timing, eliminating the need for direct pressure sensing at the pump.
2Speed
If the transmission pump operates without priming after engine restart, then vehicle responsiveness is improved, but transmission component wear increases
Solution Approach 1:
The control algorithm performs preliminary assessment of priming needs based on engine off-duration and vehicle conditions before the pump operates. By predicting when air entrapment is likely to occur and pre-priming the pump, the system ensures readiness without delaying vehicle operation.
Solution Approach 2:
The system continuously monitors transmission fluid pressure and pump operation status, using this feedback to adjust priming timing and duration. The controller modifies priming strategy based on real-time pressure readings and operational conditions to balance responsiveness and component protection.
3Reliability
If pump priming is performed continuously, then transmission performance is maintained, but energy consumption increases
Solution Approach 1:
Instead of continuous operation, the pump is activated periodically only when the control algorithm determines priming is necessary. The system assesses engine off-duration, vehicle performance conditions, and transmission pressure to trigger priming events at optimal intervals, reducing unnecessary energy consumption while maintaining performance.
Solution Approach 2:
The control algorithm dynamically adjusts pump operation parameters (timing, duration, intensity) based on changing vehicle conditions. By modifying these parameters according to actual needs rather than using fixed continuous operation, the system maintains transmission performance while minimizing energy usage.
Data Source
AI summary
A method of controlling a start-stop vehicle transmission pump, includes: assessing how long an engine has been turned off; and when the engine has been turned off for longer than a predetermined threshold and the vehicle is on, priming the transmission pump.