Wide open throttle guard for a vehicle for high elevation changes

摘要

A system for improving performance of a hybrid vehicle at higher elevations. The system includes a plurality of wheels, an engine, an altitude sensor, a transmission, a memory for storing target engine speeds, and a processor. The engine provides a torque to the plurality of wheels through the transmission, based on gear ratios limited by a wide open throttle (WOT) guard. The altitude sensor determines an elevation of the vehicle. Above a certain threshold elevation, the processor changes the WOT guard to improve performance at lower gears, such as standing start performance.

主权项

1. A system for adjusting a gear ratio limit of a vehicle comprising:
a transmission configured to shift gear ratios; an engine coupled to the transmission and having an engine speed and an engine power; an altitude sensor configured to detect an altitude of the vehicle; a memory configured to store the gear ratio limit based on the engine speed and the engine power, and to store a predetermined altitude corresponding to an altitude above which an engine performance of the engine is reduced; and a processor coupled to the altitude sensor, the memory and the transmission, and that lowers the gear ratio limit based on the altitude when the altitude of the vehicle exceeds the predetermined altitude such that the transmission can stay in a lower gear for a longer period of time than if the gear ratio limit was not lowered.