Patent ID: 8812204
Filing Date: 2014-08-19
Classification: F16H,Y10T

Abstract:
1. An oil pump control apparatus of a vehicle comprising: a first oil pump driven by a first driving power source configured to propel the vehicle; a second oil pump driven by a second driving power source; a hydraulically-operated portion that is supplied with working oil from the first and second oil pumps; a look-ahead vehicle speed estimation section configured to estimate, based on both a vehicle speed and a vehicle deceleration rate, a look-ahead vehicle speed that is estimated in the look-ahead vehicle speed estimation section to occur after a given elapsed time; a second-oil-pump control section configured to: a look-ahead revolution speed calculation section configured to arithmetically calculate and estimate, based on the look-ahead vehicle speed, a look-ahead revolution speed of a rotating member having a driving-connection with the first oil pump, wherein: the look-ahead revolution speed is calculated and estimated in the look-ahead revolution speed calculation section to occur after the given elapsed time, the hydraulically-operated portion comprises a friction engagement element, the friction engagement element and the rotating member being provided on a power-transmission path between the first driving power source and drive road wheels such that engagement-disengagement states of the friction engagement element are switched by the working oil from at least one of the first and second oil pumps, the first oil pump comprises a mechanical oil pump laid out to be offset toward the first driving power source on the power-transmission path from the friction engagement element, the mechanical oil pump is driven by the rotating member provided on the power-transmission path and is configured to supply the working oil to the friction engagement element, the second oil pump comprises an electric-motor-driven oil, pump, the second driving power source comprises an electric motor configured to drive the electric-motor-driven oil pump, the second-oil-pump control section comprises an electric-motor-driven oil pump control section configured to control switching between an operative state and an inoperative state of the electric-motor-driven oil pump, the electric-motor-driven oil pump control section is configured to: the friction engagement element comprises a clutch installed in an automatic transmission, the rotating member comprises an input shaft of the automatic transmission, the look-ahead revolution speed calculation section comprises a look-ahead input speed arithmetic-calculation section configured to arithmetically calculate and estimate, based on an actual revolution speed of the input shaft and the vehicle deceleration rate, a look-ahead input speed of the input shaft, the look-ahead input speed is calculated and estimated in the look-ahead input speed arithmetic-calculation section to occur after the given elapsed time, and the electric-motor-driven oil pump control section is configured to switch the electric-motor-driven oil pump to the operative state, when, under the inoperative state of the electric-motor-driven oil pump, the look-ahead input becomes less than or equal to a first set speed that is set as an under-developed pump discharge pressure decision threshold value.