Scalable hydraulic charging in a vehicle having engine autostop/start functionality

摘要

A method for hydraulically charging a fluid circuit in a vehicle includes calculating a fluid volume of the fluid circuit via a controller, and comparing a speed of the vehicle to a calibrated speed threshold. The method also includes calculating a vehicle deceleration rate when the speed of the vehicle is less than the calibrated speed threshold and the fluid volume is less than a calibrated volume threshold. The fluid circuit is then hydraulically charged to a target volume, using a fluid pump, at a hydraulic charging rate that corresponds to the calculated vehicle deceleration rate. A vehicle includes an engine, transmission having a fluid circuit with a fluid pump, and a controller. The controller executes instructions to charge the fluid circuit according to the method noted above. A system includes the transmission and controller.

主权项

1. A method for hydraulically charging a fluid circuit in a vehicle having an engine with autostop/start functionality, the method comprising:
calculating, via a controller of the vehicle, an actual fluid volume of the fluid circuit; comparing a speed of the vehicle to a calibrated speed threshold; calculating a vehicle deceleration rate, via the controller, when the speed of the vehicle is less than the calibrated speed threshold and the actual fluid volume is less than a calibrated volume threshold; and using a fluid pump to hydraulically charge the fluid circuit to a target fluid volume, prior to shutting off the engine during an engine autostop event, at a scalable hydraulic charging rate, wherein the scalable hydraulic charging rate corresponds to the calculated vehicle deceleration rate.