method and device for determining a starter speed of a starter of a starter system

• US 20120209501A1
• Filed: 07/07/2010
• Published: 08/16/2012
• Est. Priority Date: 09/04/2009
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Tumback, Stefan, Sengebush, Falco
• Application Number:
  US13/390,566
• Publication Number:
  US 20120209501A1
• Time in Patent Office: Days
• US Class Current: 701/113
• CPC Class Codes: F02N 11/0814 comprising means for controlling automatic idle-start-stop
• CPC Class Codes: F02N 11/0844 with means for restarting the engine directly after an engine stop request, e.g. caused by change of driver mind
• CPC Class Codes: F02N 11/0855 during engine shutdown or after engine stop before start command, e.g. pre-engagement of pinion
• CPC Class Codes: F02N 2200/041 Starter speed
• CPC Class Codes: F02N 2200/043 Starter voltage
• CPC Class Codes: F02N 2200/044 Starter current
• CPC Class Codes: F02N 2200/046 Energy or power necessary for starting
• CPC Class Codes: F02N 2200/063 Battery voltage
• CPC Class Codes: F02N 2300/102 Control of the starter motor speed; Control of the engine speed during cranking
• CPC Class Codes: F02N 2300/2008 using a model
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method and device for determining a starter speed of a starter of a start-stop system. At least one electrical variable of the starter is ascertained during a run-up of the starter, and the current starter speed of the starter is determined as a function of it.

Claims

1-14. -14. (canceled)

15. A method for determining a starter speed of a starter of a start-stop system, comprising:

measuring at least one electrical variable of the starter during a run-up of the starter; and

determining a current starter speed as a function of the at least one measured electrical variable.

16. The method as recited in claim 15, wherein to measure the at least one electrical variable, one of a starter current or a starter voltage is measured during the run-up of the starter.

17. The method as recited in claim 15, wherein the current starter speed is determined as a function of an integration value provided by integrating the at least one electrical variable, the at least one electrical variable including a measured starter current, over a time of the starter run-up.

18. The method as recited in claim 15, wherein the current starter speed is determined as a function of an integration value, wherein a measured starter current is corrected using an offset and the integration value is provided by integrating a corrected starter current.

19. The method as recited in claim 17, wherein the current starter speed is determined as a function of the provided integration value, a reference speed and a reference integration value.

20. The method as recited in claim 19, wherein the current starter speed is calculated from a quotient of a product of the integration value and the reference speed, and the reference integration value.

21. The method as recited in claim 19, wherein the reference speed and the reference integration value for a plurality of instants during the time of the starter run-up are stored in a look-up table.

22. The method as recited in claim 15, wherein to measure the at least one electrical variable, a starter current during the starter run-up and a starter voltage dropping at the starter during the starter run-up are measured, and the electrical energy taken up by the starter is calculated as a function of the measured starter current and the measured starter voltage.

23. The method as recited in claim 22, wherein to determine the current starter speed, the current starter speed is calculated as a function of a reference speed, the calculated electrical energy, and a reference energy.

24. The method as recited in claim 23, wherein the current starter speed is calculated as a product of the reference speed and a square root of a quotient of the calculated electrical energy and the reference energy.

25. The method as recited in claim 15, wherein the current starter speed is calculated based on the following formula:

26. The method as recited in claim 15, wherein the current starter speed is calculated based on the following formula:

27. A method for setting a starting duration of a pinion-type starter, of a start-stop system, comprising:

measuring at least one electrical variable of the starter during a run-up of the starter; and

determining a current starter speed as a function of the at least one measured electrical variable; and

setting the starting duration of the starter as a function of the determined, current starter speed in such a manner that the starter speed becomes synchronous with a speed of a combustion engine that is running down.

28. A device for determining a starter speed of a starter of a start-stop system, comprising:

a measuring arrangement to measure at least one electrical variable of the starter during a run-up of the starter; and

a determining arrangement to determine a current starter speed as a function of the at least one measured electrical variable.

29. A start-stop system, comprising:

a starter; and

a device for determining a starter speed of the starter wherein the device includes a measuring arrangement to measure at least one electrical variable of the starter during a run-up of the starter, and a determining arrangement to determine a current starter speed as a function of the at least one measured electrical variable.