Oil pressure control apparatus

摘要

Oil pressure is produced by an electrical pump during an engine operation is temporarily stopped according to an idling-stop function and respectively supplied to multiple electromagnetic valves. A command value for a drive current is supplied to each of a driver circuit in order to adjust the oil pressure to be outputted from the corresponding electromagnetic valve. Such adjusted oil pressure is applied to a corresponding gear-change element and an oil-pressure a detecting device detects the oil pressure applied to the gear-change element to obtain detection value for the oil pressure. A current-command characteristic for each of the electromagnetic valves is updated based on the command value of the drive current and the detection value of the oil pressure.

主权项

1. An oil pressure control apparatus, which controls oil pressure of working oil to be supplied to gear-change elements of an automatic transmission apparatus for a vehicle, comprising;
a mechanical pump driven by an engine of the vehicle and producing the oil pressure; multiple electromagnetic valves respectively connected to each of the gear-change elements so as to adjust the oil pressure produced by the mechanical pump and to output such adjusted oil pressure to the corresponding gear-change elements; an oil-pressure command portion for obtaining a command value of the oil pressure to be applied to each of the gear-change elements; a drive-current command portion for outputting a command value of a drive current to a driver circuit for each of the electromagnetic valves, wherein the drive-current command portion has a current-command characteristic for each of the electromagnetic valves and calculating the command value of the drive current by applying the command value of the oil pressure to the current-command characteristic, and wherein the current-command characteristic corresponds to a correlation between the command value of the drive current and the command value of the oil pressure; a second oil-pressure source for producing the oil pressure without depending on an operation of the engine in order to supply the oil pressure of the second oil-pressure source to the electromagnetic valves; an oil-pressure detecting device for detecting oil pressure of the working oil applied to the gear-change elements; and a control unit which includes the oil-pressure command portion and the drive-current command portion, wherein the control unit operates the second oil-pressure source in order to produce the oil pressure during the engine is stopped and to supply the oil pressure to the electromagnetic valves, wherein the control unit supplies the command value of the drive current from the drive-current command portion to the driver circuit in order that the electromagnetic valves adjust the oil pressure to be applied to the gear-change elements, wherein the control unit obtains a detection value of the oil pressure applied to the gear-change elements, based on detection by the oil-pressure detecting device, and wherein the control unit updates the current-command characteristic based on the command value of the drive current and the detection value of the oil pressure, during the engine is stopped.