Methods and systems for starter actuation

Patent metadata

Field	Value
Publication number	US-11168658-B2
Application number	US-201917257385-A
Country	US
Kind code	B2
Filing date	Jun 26, 2019
Priority date	Jul 5, 2018
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A method actuates a starter of an internal combustion engine by way of a starter relay. The starter relay is configured to supply the starter optionally with current via an on-board electrical system. The method has the following steps: determining an error status of the internal combustion engine; commencing repeated actuations of the starter relay; determining a current status of the internal combustion engine, wherein the current status of the internal combustion engine displays at least one error status or at least one operating status; and, if the current status displays at least one operating status, ending the repeated actuation of the starter relay, otherwise once again determining the current status. A system for actuating a starter of an internal combustion engine includes a control device, a power source, a starter relay, connected to the control device and configured to supply the starter of the internal combustion engine optionally with current from the power source via an on-board electrical system, wherein the control device is configured to carry out the method.

First claim

What is claimed is:

1. A method for actuating a starter of an internal combustion engine by way of a starter relay, wherein the starter relay is configured so as to supply the starter selectively with electric current by way of a vehicle electrical system, the method comprising the acts of:
determining an error state of the internal combustion engine;
starting repeated actuations of the starter relay;
determining a prevailing state of the internal combustion engine, wherein the prevailing state of the internal combustion engine indicates at least one error state or at least one operating state; and
when the prevailing state indicates at least one operating state, terminating the repeated actuation of the starter relay, otherwise repeating the procedure of determining the prevailing state.

2. The method according to claim 1 , wherein the act of actuating the starter relay comprises:
closing the starter relay for a first predetermined period of time and subsequently opening the starter relay for a second predetermined period of time.

3. The method according to claim 2 , further comprising:
actuating the starter relay for a first time, wherein the first predetermined time period in the case of the starter relay being actuated for the first time lies in the range of up to 3000 ms.

4. The method according to claim 2 , wherein
in an event of the repeated actuation of the starter relay, the first predetermined period of time lies in the range of 130 ms to 230 ms.

5. The method according to claim 4 , wherein
in an event of the repeated actuation of the starter relay, the second predetermined period of time lies in the range of 130 ms to 230 ms.

6. The method according to claim 2 , wherein
in an event of the repeated actuation of the starter relay, the second predetermined period of time lies in the range of 130 ms to 230 ms.

7. The method according to claim 1 , wherein the act of determining the error state or the prevailing state of the internal combustion engine is performed based on one or more of the following acts:
determining an electric current consumption of the starter;
determining that the vehicle electrical system is not experiencing a voltage drop;
determining a rotational speed of the internal combustion engine; and
determining an open-load error.

8. The method according to claim 1 , wherein the act of determining an error state of the internal combustion engine is performed based on one or more of the following acts:
determining the error state based on an electric current consumption of the starter of essentially zero;
determining a voltage of the vehicle electrical system and establishing a lack of an anticipated voltage drop;
determining a voltage drop in the voltage of the vehicle electrical system that is less than an anticipated voltage drop;
determining the error state based on an established open-load error;
determining the error state based on a rotational speed of the internal combustion engine of essentially zero and an electric current consumption of the starter of essentially not equal to zero; and
determining the error state based on electric current consumption of the starter that is essentially greater than a normal electric current consumption of the starter in the case of regular start-up procedures of the internal combustion engine.

9. The method according to claim 1 , wherein the prevailing state of the internal combustion engine also indicates at least one termination state, wherein the termination state is determined based on one or more of the following acts;
exceeding a predetermined time limit since the start of the repeated actuation of the starter, wherein the predetermined time limit amounts up to 15 seconds;
exceeding a maximal number of actuations of the starter within a predetermined time period, wherein the maximal number is less than 50, and/or the predetermined time period is less than 15 seconds;
rescinding a request to start-up the internal combustion engine by a user or an engine controller; and
starting up the internal combustion engine;
the method further comprising the act of:
when the prevailing state indicates at least one termination state, terminating the repeated actuation of the starter relay.

10. The method according to claim 2 , further comprising:
actuating the starter relay for a first time, wherein the first predetermined time period in the case of the starter relay being actuated for the first time lies in the range of up to 500 ms.

11. The method according to claim 2 , wherein
in an event of the repeated actuation of the starter relay, the first predetermined period of time lies in a region of approximately 180 ms.

12. The method according to claim 11 , wherein
in an event of the repeated actuation of the starter relay, the second predetermined period of time lies in a region of approximately 180 ms.

13. A system for actuating a starter of an internal combustion engine, comprising:
a control unit;
an electric current source;
a starter relay, connected to the control unit and configured so as to supply the starter of the internal combustion engine selectively with electric current from the electric current source, wherein
the control unit is configured so as to perform the acts of:
determining an error state of the internal combustion engine;
starting repeated actuations of the starter relay;
determining a prevailing state of the internal combustion engine, wherein the prevailing state of the internal combustion engine indicates at least one error state or at least one operating state; and
when the prevailing state indicates at least one operating state, terminating the repeated actuation of the starter relay, otherwise repeating the procedure of determining the prevailing state.

14. A vehicle comprising the system according to claim 13 .

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Cansever Uemit
• Holt Peter

Classifications

• F02N15/067

  the starter comprising an electro-magnetically actuated lever · CPC title

• F02N11/0829 Primary

  related to special engine control, e.g. giving priority to engine warming-up or learning · CPC title

• F02N2200/044

  Starter current · CPC title

• F02N2200/022

  Engine speed · CPC title

• F02N2200/063

  Battery voltage · CPC title