Start-stop device for commencing an automatic switch-off process of a drive machine

Patent metadata

Field	Value
Publication number	US-10836389-B2
Application number	US-201715824469-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	May 29, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A start-stop device for commencing an automatic switch-off process of a drive machine in a motor vehicle includes means for detecting a first trigger condition for initiating an automatic switch-off process, means for detecting a second trigger condition for initiating an automatic switch-off process if the first trigger condition can no longer be met, and means for initiating an automatic switch-off process of the drive machine if the first trigger condition or the second trigger condition is met.

First claim

What is claimed is:

1. A start-stop device for commencing an automatic switch-off process of a drive machine in a motor vehicle comprises:
one or more sensors that detect a first trigger condition for initiating an automatic switch-off process;
one or more sensors that detect a second trigger condition for initiating the automatic switch-off process, wherein the one or more sensors that detect the second trigger condition are activated to detect the second trigger condition in response to a detection that the first trigger condition cannot be met; and
means for initiating an automatic switch-off process of the drive machine in response to a detection that the first trigger condition is met, and for initiating the automatic switch-off process in response to a detection that the second trigger condition is met.

2. The start-stop device as claimed in claim 1 , wherein, as a result of the first or second trigger conditions being met, an effectiveness of switch-off prevention criteria not imperatively necessary for operation of the motor vehicle is suppressed.

3. The start-stop device as claimed in claim 1 , wherein the first trigger condition is met if, when the start-stop device is activated, a braking torque demanded owing to a deceleration demand is higher than a predefined first braking-torque-based switch-off threshold, and a vehicle speed is lower than a predefined speed threshold.

4. The start-stop device as claimed in claim 2 , wherein the first trigger condition is met if, when the start-stop device is activated, a braking torque demanded owing to a deceleration demand is higher than a predefined first braking-torque-based switch-off threshold, and a vehicle speed is lower than a predefined speed threshold.

5. The start-stop device as claimed in claim 1 , wherein the first trigger condition is met before a vehicle standstill state is attained if, when the start-stop device is activated, a braking torque demanded owing to a deceleration demand is higher than a predefined first braking-torque-based switch-off threshold, and a vehicle speed is lower than a predefined positive speed threshold.

6. The start-stop device as claimed in claim 2 , wherein the first trigger condition is met before a vehicle standstill state is attained if, when the start-stop device is activated, a braking torque demanded owing to a deceleration demand is higher than a predefined first braking-torque-based switch-off threshold, and a vehicle speed is lower than a predefined positive speed threshold.

7. The start-stop device as claimed in claim 1 , wherein the first trigger condition is met in a vehicle standstill state if, when the start-stop device is active, a braking torque demanded owing to a deceleration demand is higher, within a predefined first time interval which begins when a vehicle standstill state is attained, than a predefined first braking-torque-based switch-off threshold.

8. The start-stop device as claimed in claim 1 , wherein the second trigger condition is met if, in a vehicle standstill state, a vehicle transmission is shifted into a park position.

9. The start-stop device as claimed in claim 1 , wherein the second trigger condition is met if, in a vehicle standstill state, a brake pedal is actuated with increased intensity.

10. The start-stop device as claimed in claim 1 , wherein the second trigger condition is met if, in a vehicle standstill state, a braking torque demanded owing to actuation of a brake pedal exceeds a predefined second braking-torque-based switch-off threshold which is higher than a predefined first braking-torque-based switch-off threshold to be taken into account in the case of the first trigger condition.

11. The start-stop device as claimed in claim 1 , wherein the second trigger condition is met if, in a vehicle standstill state, a braking torque demanded owing to actuation of a brake pedal exceeds, within a second time interval which begins with intensified actuation of a brake pedal, a predefined second braking-torque-based switch-off threshold which is higher than a predefined first braking-torque-based switch-off threshold to be taken into account in the case of the first trigger condition.

12. The start-stop device as claimed in claim 10 , wherein, if a braking torque demanded on the basis of a deceleration demand before intensified actuation of a brake pedal is higher than the predefined first braking-torque-based switch-off threshold, the predefined second braking-torque-based switch-off threshold is formed from the braking torque demanded on the basis of the deceleration demand before intensified actuation of the brake pedal and from an offset braking torque.

13. The start-stop device as claimed in claim 10 , wherein, if a braking torque demanded on the basis of a deceleration demand before intensified actuation of a brake pedal is not higher than the predefined first braking-torque-based switch-off threshold, the predefined second braking-torque-based switch-off threshold is formed from the predefined first braking-torque-based switch-off threshold and an offset braking torque.

14. The start-stop device as claimed in claim 1 , further comprising:
one or more sensors that detect a third trigger condition for initiating an automatic switch-off process, and
means for initiating an automatic switch-off process of the drive machine if the third trigger condition is met.

15. The start-stop device as claimed in claim 14 , wherein the third trigger condition is met if, after initial manual deactivation of the start-stop device, said start-stop device is manually activated in a vehicle standstill state where no safety-relevant or operationally-critical switch-off prevention criterion is met.

16. A method for commencing an automatic switch-off process of a drive machine in a motor vehicle, the method comprising:
detecting whether a first trigger condition for initiating an automatic switch-off process can be met;
in response to detecting that the first trigger condition can be met:
detecting that the first trigger condition is met, and
initiating the automatic switch-off process in response to detecting that the first trigger condition is met; and

in response to detecting that the first trigger condition cannot be met:
detecting that a second trigger condition for initiating the automatic switch-off process is met, and
initiating the automatic switch-off process in response to detecting that the second trigger condition is met.

17. The method as claimed in claim 16 , further comprising suppressing an effectiveness of switch-off prevention criteria not imperatively necessary for operation of the motor vehicle in response to the first or second trigger conditions being met.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Bodendorf Frank
• Treutler Daniela

Classifications

• F02N11/0822 Primary

  related to action of the driver · CPC title

• B60W2540/12

  Brake pedal position · CPC title

• B60W2520/10

  Longitudinal speed · CPC title

• F02N2200/0808

  Steering state, e.g. state of power assisted steering · CPC title

• F02N2200/102

  Brake pedal position · CPC title