METHOD FOR STARTING AN INTERNAL COMBUSTION ENGINE

• US 20110118963A1
• Filed: 11/02/2010
• Published: 05/19/2011
• Est. Priority Date: 11/13/2009
• Status: Abandoned Application

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: NASSIF, SERGE, BAUR, PETER
• Application Number:
  US12/917,508
• Publication Number:
  US 20110118963A1
• Time in Patent Office: Days
• US Class Current: 701/113
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 30/18018 Start-stop drive, e.g. in a traffic jam
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: B60W 30/18054 at stand still, e.g. engine in idling state hill holding B60W30/18118
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: B60W 50/06 Improving the dynamic response of the control system, e.g. improving the speed of regulation or avoiding hunting or overshoot
• CPC Class Codes: F02N 11/00 Starting of engines by means of electric motors
• CPC Class Codes: F02N 11/0814 comprising means for controlling automatic idle-start-stop
• CPC Class Codes: F02N 19/00 Starting aids for combustion engines, not otherwise provided for
• CPC Class Codes: F02N 2300/304 with other systems inside the vehicle
• CPC Class Codes: F02N 7/00 Starting apparatus having fluid-driven auxiliary engines or apparatus
• CPC Class Codes: F02N 9/04 the pressure fluid being generated otherwise, e.g. by compressing air
• CPC Class Codes: F16H 2061/0046 Details of fluid supply channels, e.g. within shafts, for supplying friction devices or transmission actuators with control fluid
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

In a method for starting an internal combustion engine of a motor vehicle which is connected to a transmission via a starting device and operated in a start/stop operating mode, a hydraulic medium is fed to the starting device via a valve device by a hydraulic pump. Before and during starting of the internal combustion engine by use of a starter, a control unit actuates the valve device in such a way that the valve device enables delivery of the hydraulic medium to the starting device. The control unit actuates the hydraulic pump in such a way that during the starting of the internal combustion engine the hydraulic pump delivers the hydraulic medium directly into the starting device in order to bring about a mechanical operative connection between the internal combustion engine and the transmission by the starting device.

Claims

1. A method for starting an internal combustion engine of a motor vehicle connected to a transmission via a starting device and operated in a start/stop operating mode, which comprises the steps of:

feeding a hydraulic medium to the starting device via a valve device by a hydraulic pump via the further steps of;

before the internal combustion engine is started by a starter, actuating, via a control unit, the valve device such that the valve device enables delivery of the hydraulic medium to the starting device; and

actuating, via the control unit, the hydraulic pump such that during a starting of the internal combustion engine the hydraulic pump delivers the hydraulic medium directly into the starting device to bring about a mechanical operative connection between the internal combustion engine and the transmission by means of the starting device.

2. The method according to claim 1, which further comprises energizing, via the control unit, the valve device by means of a CAN message before and during the starting of the internal combustion engine.

3. The method according to claim 1, which further comprises using oil as the hydraulic medium.

4. The method according to claim 1, which further comprises providing a wet clutch as the starting device.

5. The method according to claim 1, which further comprises using the hydraulic medium to fill the starting device when the starting of the internal combustion engine begins.

6. The method according to claim 1, wherein the hydraulic pump brings about a volume flow of the hydraulic medium necessary to fill the starting device, without using auxiliary devices.

7. The method according to claim 1, which further comprises driving the hydraulic pump by the internal combustion engine, wherein a first revolution of the internal combustion engine after the starting thereof, already drives the hydraulic pump and delivers the hydraulic medium into the starting device.

8. The method according to claim 1, which further comprises regulating a pressure of the hydraulic medium which is generated by the hydraulic pump in such a way that it approaches a target pressure asymptotically from below.