Transmission with electronic range selector and pre-emptive power loss control logic

摘要

A vehicle includes an engine, a transmission with a shift valve, an alternator, an auxiliary battery, a voltage sensor operable to measure an auxiliary voltage, and an electronic transmission range selection (ETRS) system. The ETRS system includes a controller, and also an electronic range selector device that transmits an electronic range request signal to the controller to request the shift of the transmission to a requested operating range. The controller executes a method to predict a loss of auxiliary power aboard the vehicle, and to control an action of the vehicle in response to the predicted loss of auxiliary power. The electronic range request signal is received from the range selector device and auxiliary voltage. The controller calculates a slope of a decrease in the measured auxiliary voltage. A control action is executed with the alternator is in the charging state and the calculated slope exceeds a calibrated slope threshold.

主权项

1. A vehicle comprising:
an engine; a transmission connected to the engine and having a shift valve that is operable to shift the transmission to a requested operating range; an alternator that is driven by the engine; an auxiliary battery that is electrically connected to the alternator; a voltage sensor positioned between the alternator and the auxiliary battery, wherein the voltage sensor is operable to measure an auxiliary voltage; and an electronic transmission range selection (ETRS) system having a controller and an electronic range selector device, wherein the electronic range selector device is operable to transmit an electronic range request signal to the controller to request the shift of the transmission to the requested operating range; wherein the controller is programmed to predict a loss of auxiliary power aboard the vehicle, and to control an action of the vehicle in response to the predicted loss of auxiliary power by:
receiving the electronic range request signal from the electronic range selector device and the measured auxiliary voltage;determining if the alternator is in a charging state and the measured auxiliary voltage is less than a calibrated voltage threshold;calculating a slope of a decrease in the measured auxiliary voltage; andexecuting a control action with respect to the vehicle when the alternator is in the charging state and the calculated slope exceeds a calibrated slope threshold.