Method for operating an oil supply and controller

Abstract

A method is provided for operating an oil supply for a combustion engine and/or a transmission system of a motor vehicle particularly with start/stop-automatic, comprises the steps, that a deceleration of the motor vehicle is detected, at least one status parameter, which correlates with the manner of the deceleration, is monitored, a future oil pressure of the oil supply is estimated based on the status parameter and the actual oil supply control strategy, and if the estimated future oil pressure is below a predetermined threshold of the oil pressure, an oil pump for filling an accumulator tank of the oil supply is activated. Since the accumulator tank is filled in advance of a possible automatic stop a sufficient high oil pressure, when the combustion engine is started again, is safeguarded, wherein the period of time for accomplishing the automatic stop is not lengthened. This leads to a reduction of the fuel consumption and the CO 2 -emissions of the combustion engine without dealing with a too low oil pressure at the start of the combustion engine.

1 . A method for operating an oil supply of a motor vehicle, comprising the steps of:
 detecting a deceleration of the motor vehicle;   monitoring at least one status parameter that correlates with a manner of the deceleration;   estimating a future oil pressure of the oil supply based on a status parameter and an actual oil supply control strategy; and   activating an oil pump for filling an accumulator tank of the oil supply if an estimated future oil pressure is below a predetermined threshold of an oil pressure.   
     
     
         2 . The method according to  claim 1 , wherein the status parameter is an amount of the deceleration. 
     
     
         3 . The method according to  claim 1 , wherein the status parameter is a speed of the motor vehicle. 
     
     
         4 . The method according to  claim 1 , wherein the status parameter is a brake status. 
     
     
         5 . The method according to  claim 1 , wherein based on at least one status parameter, a stop-time (t stop ) is calculated, until which a speed of the motor vehicle will be zero due to a start/stop-automatic will occur, and the future oil pressure is calculated for an end of the stop-time (t stop ). 
     
     
         6 . The method according to  claim 1 , wherein based on at least one status parameter, a stop-time (t stop ) is calculated, until which an automatic stop of a combustion engine due to a start/stop-automatic will occur, and the future oil pressure is calculated for an end of the stop-time (t stop ). 
     
     
         7 . The method according to  claim 1 ,
 wherein the oil pump is activated, if an automatic stop of a start/stop-automatic is unblocked,   wherein the automatic stop is particularly blocked when a charge of an automotive battery is below a predetermined value.   
     
     
         8 . The method according to  claim 1 ,
 wherein the oil pump is activated, if an automatic stop of a start/stop-automatic is unblocked,   wherein a value of a vehicle component is out of a predetermined range.   
     
     
         9 . The method according to  claim 1 , wherein the oil pump is activated, if an automatic stop of a start/stop-automatic is unblocked,
 wherein a combustion engine control is on override mode from a subsystem particularly from a control.   
     
     
         10 . The method according to  claim 1 , wherein the predetermined threshold is determined on a basis of a ratio of a fill volume V of the accumulator tank to a maximum fill volume V max  of the accumulator tank, wherein 0.75≦V/V max ≦0.99. 
     
     
         11 . The method according to  claim 1 , wherein the predetermined threshold is determined on a basis of a ratio of a fill volume V of the accumulator tank to a maximum fill volume V max  of the accumulator tank, wherein 0.85≦V/V max ≦0.95. 
     
     
         12 . The method according to  claim 1 , wherein the predetermined threshold is determined on a basis of a ratio of a fill volume V of the accumulator tank to a maximum fill volume V max  of the accumulator tank, wherein V/V max =0.90±0.02 is given. 
     
     
         13 . The method according to  claim 1  wherein the oil pump is electrically operable and adapted to be fed by electrical energy from a generator for providing a braking force to the motor vehicle. 
     
     
         14 . A apparatus adapted to operate an oil supply of a motor vehicle, comprising:
 a sensor adapted to detect a status parameter that correlates with a manner of a deceleration;   a data input adapted to connect to an oil supply controller;   a calculation unit adapted to estimate a future oil pressure of the oil supply based on the status parameter and an actual oil supply control strategy; and   an activator output connected to an oil pump for filling an accumulator tank of the oil supply, if an estimated future oil pressure is below a predetermined threshold of an oil pressure.   
     
     
         15 . The apparatus according to  claim 14 , wherein the status parameter is an amount of the deceleration. 
     
     
         16 . The apparatus according to  claim 14 , wherein the status parameter is a speed of the motor vehicle. 
     
     
         17 . The apparatus according to  claim 14 , wherein the status parameter is a brake status. 
     
     
         18 . The apparatus according to  claim 14 , wherein based on at least one status parameter, a stop-time (t stop ) is calculated, until which a speed of the motor vehicle will be zero due to a start/stop-automatic will occur, and the future oil pressure is calculated for an end of the stop-time (t stop ). 
     
     
         19 . The apparatus according to  claim 14 , wherein based on at least one status parameter, a stop-time (t stop ) is calculated, until which an automatic stop of a combustion engine due to a start/stop-automatic will occur, and the future oil pressure is calculated for an end of the stop-time (t stop ). 
     
     
         20 . The apparatus according to  claim 14 ,
 wherein the oil pump is activated, if an automatic stop of a start/stop-automatic is unblocked,   wherein the automatic stop is particularly blocked when a charge of an automotive battery is below a predetermined value.