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Method for operating an oil supply and controller

a controller and oil supply technology, applied in the direction of mechanical equipment, machines/engines, instruments, etc., can solve the problems of high fuel consumption and co2/sub>-emissions of combustion engines, and achieve the effects of reducing fuel consumption and co2-emissions

Inactive Publication Date: 2011-02-24
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a method for operating an oil supply system for a combustion engine and a transmission system of a motor vehicle, particularly in a start / stop-automatic system. The method involves monitoring various parameters such as deceleration of the vehicle, oil pressure, and engine speed, and using those parameters to estimate the future oil pressure and activate the oil pump in advance. This allows for a sufficient oil pressure for starting the engine, without causing delays in the start of the automatic stop. The method can be used in both conventional and hybrid vehicles, and can help reduce fuel consumption and CO2 emissions.

Problems solved by technology

It is a disadvantage of such kind of a method that the fuel consumption and the CO2-emissions of the combustion engine are high.

Method used

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  • Method for operating an oil supply and controller

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Embodiment Construction

The following detailed description is merely exemplary in nature and is not intended to limit application and uses. Furthermore, there is no intention to be bound by any theory presented in the preceding background or summary or the following detailed description.

As illustrated in FIG. 1 a motor vehicle may comprise a vehicle speed v1 and can be decelerated at a time t1. Under the assumption of a constant deceleration the vehicle speed decreases until at a time t3 a vehicle speed of v0=0 km / h is reached. Usually it takes a period of time at zero vehicle speed v0 until a start / stop-automatic of the motor vehicle initiates an automatic stop of a combustion engine of the motor vehicle at a time t4.

From time t1 on the method monitors whether a minimum oil pressure for an oil supply system will be provided at the time t4. When for example the actual time is t2 it is calculated based on the actual vehicle speed v2 and the actual amount of the deceleration a={dot over (ν)}2 a stop-time tst...

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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 CO2-emissions of the combustion engine without dealing with a too low oil pressure at the start of the combustion engine.

Description

CROSS-REFERENCE TO RELATED APPLICATIONThis application claims priority to British Patent Application No. 0914479.1, filed Aug. 19, 2009, which is incorporated herein by reference in its entirety.TECHNICAL FIELDThe technical field relates to a method for operating an oil supply for a combustion engine and / or a transmission system of a motor vehicle as well as a corresponding controller, by means of which the oil pressure of the oil supply system can be controlled.BACKGROUNDFrom DE 100 41 789 A1 it is known to override the command for an automatic stop of a combustion engine with start / stop-automatic at low oil pressure, so that an oil pump can fill an accumulator tank first before the combustion engine is stopped due to the present automatic stop command. Due to the override a sufficient oil pressure can be provided, when the combustion engine starts.It is a disadvantage of such kind of a method that the fuel consumption and the CO2-emissions of the combustion engine are high.It is a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01M1/16B60W30/18
CPCB60W10/30B60W30/18127B60W2510/1075B60W2520/10F16H2312/14F01M5/02F01M7/00F16H61/0021F16H2061/0034B60W2520/105B60W50/0097B60W10/06B60W30/18018F16H61/12
Inventor HANSSON, MATTIASFREUDENTHALER, PAR
Owner GM GLOBAL TECH OPERATIONS LLC
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