Method and Apparatus for Checking a Speed System of a Motor-Driven Apparatus

• US 20130271053A1
• Filed: 04/09/2013
• Published: 10/17/2013
• Est. Priority Date: 04/12/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Wiszniewski, Jacek, Pogorzelski, Kamil, Rombach, Daniel
• Granted Patent: US 9,093,883 B2
• Time in Patent Office: Days
• US Class Current: 318/490
• CPC Class Codes: G01P 21/02 of speedometers
• CPC Class Codes: G05B 9/02 electric
• CPC Class Codes: H02K 11/20 for measuring, monitoring, testing, protecting or switching rectifiers H02K11/04; power electronics H02K11/33
• CPC Class Codes: H02K 11/21 Devices for sensing speed or position, or actuated thereby specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14

Abstract

A method for checking a speed system of a motor-driven apparatus is proposed. In the absence of a speed signal, a first aspect provides for a control device to send a test signal via the speed system, the test signal being expected at an input of the control device. If the test signal is not detected, a fault in the speed system is identified.

Claims

1. A method for checking a speed system of a motor-driven apparatus, comprising:

checking whether a speed signal is applied to a first input of a control device;

outputting a test signal at an output of the control device to the speed system if the speed signal is not applied to the first input of the control device; and

identifying a fault in the speed system if the test signal is not sensed at the first input of the control device.

2. The method according to claim 1 further comprising:

switching on the apparatus;

detecting a motor current signal from the apparatus; and

detecting the speed signal at a second input of the control device;

wherein the identifying the fault in the speed system further includes identifying the fault in the speed system if (i) the speed signal is not detected at the second input and (ii) the motor current signal undershoots a defined level.

3. The method according to claim 2 further comprising:

recording a speed value of the apparatus; and

identifying a fault in the apparatus if a defined speed value has not been reached after a defined time.

4. The method according to claim 3, wherein the identifying a fault in the apparatus occurs if a defined speed is not recorded after a defined operating time of the apparatus.

5. The method according to claim 1 further comprising:

switching on the apparatus;

recording a speed value of the apparatus; and

identifying a fault in the apparatus if a defined speed value has not been reached after a defined time.

6. The method according to claim 1 further comprising:

recording a speed of the apparatus; and

identifying a fault in the apparatus if a defined speed is not recorded after a defined operating time of the apparatus.

7. The method according to claim 1, further comprising:

determining at least one of (i) a location of the fault, and (ii) a type of the fault in the speed system.

8. The method according to claim 7, further comprising:

determining whether the fault is in at least one of (i) a speed transmitter, (ii) a speed recording device, and (iii) a speed sensor.

9. The method according to claim 1, wherein a computer program product includes a program code configured to carry out the method when the program code is (i) run on an electronic control device or (ii) is stored on a computer-readable data storage medium.

10. The method according to claim 1, wherein:

an apparatus configured to check the speed system of the motor-driven apparatus includes (i) the control device having the first input and the output,

the output is configured to be used to send the test signal to the speed system if the speed signal is not detected at the first input, and

the control device is configured to identify the fault in the speed system if the output test signal is not sensed at the first input.

11. A method for checking a speed system of a motor-driven apparatus, comprising:

switching on the apparatus;

detecting a motor current signal from the apparatus;

detecting a speed signal at a first input of the control device; and

identifying a fault in the speed system if (i) the speed signal is not detected and (ii) the motor current signal undershoots a defined level.

12. The method according to claim 11 further comprising:

recording a speed value of the apparatus; and

identifying a fault in the apparatus if a defined speed value has not been reached after a defined time.

13. The method according to claim 11 further comprising:

recording a speed of the apparatus; and

identifying a fault in the apparatus if a defined speed is not recorded after a defined operating time of the apparatus

14. A method for checking a speed system of a motor-driven apparatus, comprising:

recording a speed value of the apparatus; and

identifying a fault in the apparatus.

15. The method according to claim 14 further comprising:

switching on the apparatus,

wherein the identifying a fault in the apparatus occurs if a defined speed value has not been reached after a defined time.

16. The method according to claim 14 wherein the identifying a fault in the apparatus occurs if a defined speed is not recorded after a defined operating time of the apparatus.