Sensor controller, sensor signal receiver, incremental magnetic speed sensor module, method for a sensor controller, method for a sensor signal receiver and computer program

• US 10,520,337 B2
• Filed: 01/19/2018
• Issued: 12/31/2019
• Est. Priority Date: 01/26/2017
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Hammerschmidt, Dirk
• Primary Examiner(s): Nguyen, Nam V
• Application Number:
  US15/875,223
• Publication Number:
  US 20180209820A1
• Time in Patent Office: 711 Days
• Field of Search: 340 442, 340 343, 340 344, 340 331, 701 1, 701 33
• CPC Class Codes: G01D 21/00 Measuring or testing not otherwise provided for
• CPC Class Codes: G01D 21/02 Measuring two or more variables by means not covered by a single other subclass
• CPC Class Codes: G01D 3/08 with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06
• CPC Class Codes: G01D 5/2454 Encoders incorporating incremental and absolute signals
• CPC Class Codes: G01P 21/02 of speedometers
• CPC Class Codes: G01P 3/481 of pulse signals
• CPC Class Codes: G01P 3/489 Digital circuits therefor
• CPC Class Codes: G01R 33/0035 Calibration of single magnetic sensors, e.g. integrated calibration
• CPC Class Codes: G01R 33/0041 using feed-back or modulation techniques
• CPC Class Codes: G01R 33/09 Magnetoresistive devices
• CPC Class Codes: G05D 1/00 Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots drive control systems specially adapted for autonomous road vehicles B60W60/00

Abstract

A sensor controller for a sensor module includes at least one interface to obtain sensor information from the sensor module and to communicate with a sensor signal receiver. The sensor controller includes a control module to control the at least one interface. The control module is configured to obtain the sensor information from the sensor module; generate a sensor signal based on the sensor information; and transmit the sensor signal. The control module is further configured to detect a fault state of the sensor module; transmit a fault indicator if the fault state indicates a failure of at least a part of the sensor module; and receive a control signal from the sensor signal receiver based on the fault indicator. The control signal includes at least one fault handling instruction. The control module is configured to execute the at least one fault handling instruction.

Claims

1. A sensor controller for a sensor module, comprising

at least one interface to obtain sensor information from the sensor module and to communicate with a sensor signal receiver;

and

a control module to;

control the at least one interface,

obtain the sensor information from the sensor module,

generate a sensor signal based on the sensor information,

transmit the sensor signal,

detect a fault state of the sensor module,

transmit, based on the fault state indicating a failure of the sensor module, a fault indicator by using at least one of;

a current level above or below two or more sensor signal transmission current levels,

a pulse having a pulse width that is a threshold length longer than a pre-defined maximal pulse width, or

a flag or message encoded within a protocol frame,

receive a control signal from the sensor signal receiver based on the fault indicator,

wherein the control signal comprises at least one fault handling instruction, and

execute the at least one fault handling instruction.

2. The sensor controller according to claim 1, wherein the control module is configured to:

determine diagnostic information based on the at least one fault handling instruction, and

transmit the diagnostic information to the sensor signal receiver.

3. The sensor controller according to claim 2, wherein the control module is configured to execute a self-test of at least one of the sensor controller or the sensor module to determine the diagnostic information based on the at least one fault handling instruction.

4. The sensor controller according to claim 2, wherein the control module is configured to obtain at least a part of the diagnostic information from a memory of the sensor module.

5. The sensor controller according to claim 1, wherein the control module is configured to alter one or more parameters of the sensor controller or of the sensor module based on the at least one fault handling instruction.

6. The sensor controller according to claim 1, wherein the control module is configured to restart at least a part of one or more of the sensor module or the sensor controller based on the at least one fault handling instruction.

7. The sensor controller according to claim 1, wherein the control module is configured to accept the at least one fault handling instruction after starting transmission of the fault indicator.

8. The sensor controller according to claim 1, wherein the control module is configured to:

enter a diagnostic mode based on transmitting the fault indicator, and

execute the at least one fault handling instruction while in the diagnostic mode.

9. The sensor controller according to claim 1, wherein the control module, when transmitting the sensor signal, is configured to:

transmit the sensor signal based on at least one of;

the two or more sensor signal transmission current levels,

a signal pulse comprising the pre-defined maximal pulse width, or

the signal pulse being followed by the protocol frame.

10. The sensor controller according to claim 1, wherein the at least one interface is configured to:

communicate with the sensor signal receiver using a two wire connection, and

transmit at least one of the sensor signal or diagnostic information based on a current modulation.

11. The sensor controller according to claim 1, wherein the control signal is based on a voltage modulation of a supply voltage or of an open drain voltage.

12. The sensor controller according to claim 1, wherein the at least one interface is configured to wirelessly communicate with the sensor signal receiver.

13. The sensor controller according to claim 12, wherein the control module is configured to activate a wireless receiver portion of the at least one interface if the fault state indicates the failure of the sensor module.

14. A sensor signal receiver comprising:

at least one interface to communicate with a sensor controller; and

a control module to;

control the at least one interface,

receive a fault indicator from the sensor controller via the at least one interface,

the fault indicator indicating a failure of a sensor module associated with the sensor controller, and

the fault indicator being at least one of;

a current level above or below two or more sensor signal transmission current levels,

a pulse having a pulse width that is a threshold length longer than a pre-defined maximal pulse width, or

a flag or message encoded within a protocol frame, and

provide a control signal to the sensor controller via the at least one interface based on the fault indicator,

wherein the control signal comprises at least one fault handling instruction.

15. The sensor signal receiver according to claim 14, wherein the control module is further configured to receive diagnostics information from the sensor controller via the at least one interface based on the control signal.

16. The sensor signal receiver according to claim 14, wherein the at least one interface is configured to:

transmit the control signal by modulating the control signal onto a supply voltage, and

receive the fault indicator based on a modulated open drain voltage or a modulated current consumption of a sensor.

17. An incremental magnetic speed sensor module for automotive use comprising a sensor controller, the sensor controller comprising:

a control module to;

generate a sensor signal based on sensor information obtained from the incremental magnetic speed sensor module,

transmit the sensor signal,

detect a fault state of the incremental magnetic speed sensor module,

transmit, based the fault state indicating a failure of the incremental magnetic speed sensor module, a fault indicator by using at least one of;

a current level above or below two or more sensor signal transmission current levels,

a pulse having a pulse width that is a threshold length longer than a pre-defined maximal pulse width, or

a flag or message encoded within a protocol frame,

receive a control signal from a sensor signal receiver based on the fault indicator,

wherein the control signal comprises at least one fault handling instruction, and

execute the at least one fault handling instruction.

18. A method, comprising:

obtaining, by a sensor controller, sensor information from a sensor module;

generating, by the sensor controller, a sensor signal based on the sensor information;

transmitting, by the sensor controller, the sensor signal to a sensor signal receiver;

detecting, by the sensor controller, a fault state of the sensor module;

transmitting, by the sensor controller and based on the fault state indicating a failure of the sensor module, a fault indicator by using at least one of;

a current level above or below two or more sensor signal transmission current levels,

a pulse having a pulse width that is a threshold length longer than a pre-defined maximal pulse width, or

a flag or message encoded within a protocol frame;

receiving, by the sensor controller, a control signal from the sensor signal receiver based on the fault indicator,

wherein the control signal comprises at least one fault handling instruction; and

executing, by the sensor controller, the at least one fault handling instruction.

19. A method, comprising:

receiving, by a sensor signal receiver, a fault indicator from a sensor controller,

the fault indicator indicating a failure of a sensor module associated with the sensor controller, and

the fault indicator being at least one of;

a current level above or below two or more sensor signal transmission current levels,

a pulse having a pulse width that is a threshold length longer than a pre-defined maximal pulse width, or

a flag or message encoded within a protocol frame; and

providing, by the sensor signal receiver, a control signal to the sensor controller based on the fault indicator,

wherein the control signal comprises at least one fault handling instruction.

20. A non-transitory computer-readable medium storing instructions, the instructions comprising:

one or more instructions that, when executed by one or more processors of a sensor controller for a sensor module, cause the one or more processors to;

obtain sensor information from the sensor module;

generate a sensor signal based on the sensor information;

transmit the sensor signal to a sensor signal receiver;

detect a fault state of the sensor module;

transmit, based on the fault state indicating a failure of the sensor module, a fault indicator by using at least one of;

a current level above or below two or more sensor signal transmission current levels,

a pulse having a pulse width that is a threshold length longer than a pre-defined maximal pulse width, or

a flag or message encoded within a protocol frame;

receive a control signal from the sensor signal receiver based on the fault indicator,

wherein the control signal comprises at least one fault handling instruction; and

execute the at least one fault handling instruction.