Gear selector system

• US 8,897,974 B2
• Filed: 06/07/2010
• Issued: 11/25/2014
• Est. Priority Date: 06/07/2010
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Wu, Peter E., Robinette, Richard E., Vernacchia, Mark A., Koski, Jack P.
• Primary Examiner(s): Cheung, Calvin
• Assistant Examiner(s): Ramesh, Krishnan
• Application Number:
  US12/795,428
• Publication Number:
  US 20110296942A1
• Time in Patent Office: 1,632 Days
• Field of Search: None
• US Class Current: 701/51
• CPC Class Codes: F16H 2059/047 with essentially straight linear movement for gear selection, e.g. straight selection movement using detent mechanism for improving feeling up-down shift by repeated movements F16H2059/0239
• CPC Class Codes: F16H 2061/243 Cams or detent arrays for guiding and providing feel
• CPC Class Codes: F16H 59/105 consisting of electrical switches or sensors
• CPC Class Codes: Y10T 74/20018 Transmission control
• CPC Class Codes: Y10T 74/2003 Electrical actuator
• CPC Class Codes: Y10T 74/2011 with detent, recess, notch, or groove

Abstract

A gear selector assembly for selecting a gear position of a transmission includes an internal mode switch having detent lever, a plurality of magnetic field sensors, a control module, a first power supply and a second power supply. The detent lever has a plurality of detents and a magnetized track, where the magnetized track includes a plurality of magnetized elements that are indicative a particular gear selector position. The magnetic field sensors are associated with each of the magnetized elements for sensing changes in a magnetic field of the magnetized track. The control module is in communication with each of the field sensors. Each of the field sensors sends an output current to the control module and the value of the output current is variable. The value of the output current is indicative of at least one of the following: the direction of the magnetic field from the corresponding magnetic track, a short circuit, and an open circuit.

Claims

1. A gear selector assembly for selecting a gear position of a transmission, comprising:

an internal mode switch including a detent lever having a plurality of detents and a magnetized track, wherein the magnetized track includes a plurality of magnetized elements that are indicative a particular gear selector position based on the direction of a magnetic field, and wherein each detent corresponds to one of the gear selector positions and the detent lever is rotatable to select one of the desired gear selector positions;

a plurality of magnetic field sensors that are associated with each of the magnetized elements for sensing changes in the magnetic field of the magnetized track, where each field sensor corresponds to one of the magnetized elements of the magnetized track, the plurality of magnetic field sensors including at least a first field sensor and a second field sensor;

a control module in communication with each of the field sensors, wherein each of the field sensors sends an output current to the control module and the value of the output current is variable,

wherein the first field sensor is configured to produce a first sensor first output current value in a first sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a first sensor second output current value in a first sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a first sensor third output current value in a first sensor short current range indicative of a short circuit, and a first sensor fourth output current value in a first sensor open current range indicative of an open circuit, each of the first sensor first current range, the first sensor second current range, the first sensor short current range, and the first sensor open current range not overlapping with each other,

wherein the second field sensor is configured to produce a second sensor first output current value in a second sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a second sensor second output current value in a second sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a second sensor third output current value in a second sensor short current range indicative of a short circuit, and a second sensor fourth output current value in a second sensor open current range indicative of an open circuit, each of the second sensor first current range, the second sensor second current range, the second sensor short current range, and the second sensor open current range not overlapping with each other,

wherein the control module includes a first control logic for generating a first failure signal indicating an open circuit if the control module receives at least one of the first sensor fourth output current value from the first field sensor and the second sensor fourth output current value from the second field sensor, the control module further including a second control logic for generating a second failure signal indicating a short circuit if the control module receives at least one of the first sensor third output current value from the first field sensor and the second sensor third output current value from the second field sensor; and

a first power supply and a second power supply that provide power to the field sensors, wherein a portion of the field sensors are powered by the first power supply and the remaining field sensors are powered by the second power supply.

2. The gear selector assembly of claim 1 wherein the control module includes a third control logic for converting the output current values to output voltage values, including:

a first sensor first output voltage value in a first sensor first voltage range corresponding to the first sensor first output current value, a first sensor second output voltage value in a first sensor second voltage range corresponding to the first sensor second output current value, a first sensor third output voltage value in a first sensor short voltage range corresponding to the first sensor third output current value, and a first sensor fourth output voltage value in a first sensor open voltage range corresponding to the first sensor fourth output current value, each the first sensor first voltage range, the first sensor second voltage range, the first sensor short voltage range, and the first sensor open voltage range not overlapping with each other; and

a second sensor first output voltage value in a second sensor first voltage range corresponding to the second sensor first output current value, a second sensor second output voltage value in a second sensor second voltage range corresponding to the second sensor second output current value, a second sensor third output voltage value in a second sensor short voltage range corresponding to the second sensor third output current value, and a second sensor fourth output voltage value in a second sensor open voltage range corresponding to the second sensor fourth output current value, each the second sensor first voltage range, the second sensor second voltage range, the second sensor short voltage range, and the second sensor open voltage range not overlapping with each other.

3. The gear selector assembly of claim 2 wherein the control module includes a fourth control logic for translating the output voltage values of each field sensor to a binary bit value, and wherein a bit pattern indicating the gear selector position is created.

4. The gear selector assembly of claim 1 wherein in the event either the first power supply or the second power supply fails, the bit patterns will not create an incorrect gear selection indication.

5. A gear selector assembly for selecting a gear position of a transmission, comprising:

an internal mode switch including a detent lever having a plurality of detents and a magnetized track, wherein the magnetized track includes a plurality of magnetized elements that are indicative a particular gear selector position based on the direction of a magnetic field, and wherein each detent corresponds to one of the gear selector positions and the detent lever is rotatable to select one of the desired gear selector positions;

a plurality of magnetic field sensors that are associated with each of the magnetized elements for sensing changes in the magnetic field of the magnetized track, where each field sensor corresponds to one of the magnetized elements of the magnetized track, the plurality of magnetic field sensors including at least a first field sensor and a second field sensor;

a control module in communication with each of the field sensors, wherein each of the field sensors sends an output current to the control module and the value of the output current is variable,

wherein the first field sensor is configured to produce a first sensor first output current value in a first sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a first sensor second output current value in a first sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a first sensor third output current value in a first sensor short current range indicative of a short circuit, and a first sensor fourth output current value in a first sensor open current range indicative of an open circuit, each of the first sensor first current range, the first sensor second current range, the first sensor short current range, and the first sensor open current range not overlapping with each other,

wherein the second field sensor is configured to produce a second sensor first output current value in a second sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a second sensor second output current value in a second sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a second sensor third output current value in a second sensor short current range indicative of a short circuit, and a second sensor fourth output current value in a second sensor open current range indicative of an open circuit, each of the second sensor first current range, the second sensor second current range, the second sensor short current range, and the second sensor open current range not overlapping with each other,

wherein the control module includes a first control logic for generating a first failure signal indicating an open circuit if the control module receives at least one of the first sensor fourth output current value from the first field sensor and the second sensor fourth output current value from the second field sensor, the control module further including a second control logic for generating a second failure signal indicating a short circuit if the control module receives at least one of the first sensor third output current value from the first field sensor and the second sensor third output current value from the second field sensor; and

a first power supply and a second power supply that provide power to the field sensors, wherein a portion of the field sensors are powered by the first power supply and the remaining field sensors are powered by the second power supply wherein the control module includes a third control logic for converting the output current values to output voltage values, including;

a first sensor first output voltage value in a first sensor first voltage range corresponding to the first sensor first output current value, a first sensor second output voltage value in a first sensor second voltage range corresponding to the first sensor second output current value, a first sensor third output voltage value in a first sensor short voltage range corresponding to the first sensor third output current value, and a first sensor fourth output voltage value in a first sensor open voltage range corresponding to the first sensor fourth output current value, each the first sensor first voltage range, the first sensor second voltage range, the first sensor short voltage range, and the first sensor open voltage range not overlapping with each other; and

a second sensor first output voltage value in a second sensor first voltage range corresponding to the second sensor first output current value, a second sensor second output voltage value in a second sensor second voltage range corresponding to the second sensor second output current value, a second sensor third output voltage value in a second sensor short voltage range corresponding to the second sensor third output current value, and a second sensor fourth output voltage value in a second sensor open voltage range corresponding to the second sensor fourth output current value, each the second sensor first voltage range, the second sensor second voltage range, the second sensor short voltage range, and the second sensor open voltage range not overlapping with each other wherein the control module includes a fourth control logic for translating the output voltage values of each field sensor to a binary bit value, and wherein a bit pattern indicating the gear selector position is created wherein the bit pattern includes five bits that each have a binary value of either 0 or 1, and wherein the five bits are S, R1, R2, D1 and D2

wherein in the event either the first power supply or the second power supply fads the bit patterns will not create an incorrect gear selection indication.

6. The gear selector assembly of claim 5 wherein a complementary bit is substituted if one of the bits corresponds to a field sensor that has a known electrical fault.

7. The gear selector assembly of claim 5 wherein the control module includes an error correction logic and a plurality of predefined bit patterns, and wherein the error correction logic corrects the bit pattern if one and only one of the bits of the bit pattern is different from one of the predefined bit patterns.

8. The gear selector assembly of claim 5 wherein if the value of the output current indicates one of a short circuit and an open circuit for one of the five bits, the control module includes a fifth control logic for substituting the complement of the binary value for the corresponding bit.

9. The gear selector assembly of claim 5 wherein the binary values for the bits R1, D1, R2, and D2 are 0011 respectively for a Park gear selector position.

10. The gear selector assembly of claim 5 wherein the binary values for the bits R1, D1, R2, and D2 are 1001 respectively for a Reverse gear selector position.

11. The gear selector assembly of claim 5 wherein the binary values for the bits R1, D1, R2, and D2 are 1100 respectively for a Neutral gear selector position.

12. The gear selector assembly of claim 5 wherein the binary values for the bits R1, D1, R2, and D2 are 0110 respectively for a Drive gear selector position.

13. A gear selector assembly for selecting a gear position of a transmission, comprising:

an internal mode switch including a detent lever having a plurality of detents and a magnetized track, wherein the magnetized track includes a plurality of magnetized elements that are indicative a particular gear selector position based on the direction of a magnetic field, and wherein each detent corresponds to one of the gear selector positions and the detent lever is rotatable to select one of the desired gear selector positions;

a plurality of magnetic field sensors that are associated with each of the magnetized elements for sensing changes in the magnetic field of the magnetized track, the plurality of magnetic field sensors comprising at least a first field sensor, a second field sensor, a third field sensor, a fourth field sensor, and a fifth field sensor, where each field sensor corresponds to one of the magnetized elements of the magnetized track;

a control module in communication with each of the field sensors, wherein each of the field sensors sends an output current to the control module and the value of the output current is variable,

wherein the first field sensor is configured to produce a first sensor first output current value in a first sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a first sensor second output current value in a first sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a first sensor third output current value in a first sensor short current range indicative of a short circuit, and a first sensor fourth output current value in a first sensor open current range indicative of an open circuit, each the first sensor first current range, the first sensor second current range, the first sensor short current range, and the first sensor open current range not overlapping with each other,

wherein the second field sensor is configured to produce a second sensor first output current value in a second sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a second sensor second output current value in a second sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a second sensor third output current value in a second sensor short current range indicative of a short circuit, and a second sensor fourth output current value in a second sensor open current range indicative of an open circuit, each of the second sensor first current range, the second sensor second current range, the second sensor short current range, and the second sensor open current range not overlapping with each other,

wherein the third field sensor is configured to produce a third sensor first output current value in a third sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a third sensor second output current value in a third sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a third sensor third output current value in a third sensor short current range indicative of a short circuit, and a third sensor fourth output current value in a third sensor open current range indicative of an open circuit, each of the third sensor first current range, the third sensor second current range, the third sensor short current range, and the third sensor open current range not overlapping with each other,

wherein the fourth field sensor is configured to produce a fourth sensor first output current value in a fourth sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a fourth sensor second output current value in a fourth sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a fourth sensor third output current value in a fourth sensor short current range indicative of a short circuit, and a fourth sensor fourth output current value in a fourth sensor open current range indicative of an open circuit, each of the fourth sensor first current range, the fourth sensor second current range, the fourth sensor short current range, and the fourth sensor open current range not overlapping with each other,

wherein the fifth field sensor is configured to produce a fifth sensor first output current value in a fifth sensor first current range indicative of a first direction of the magnetic field from the corresponding magnetic track, a fifth sensor second output current value in a fifth sensor second current range indicative of a second direction of the magnetic field from the corresponding magnetic track, a fifth sensor third output current value in a fifth sensor short current range indicative of a short circuit, and a fifth sensor fourth output current value in a fifth sensor open current range indicative of an open circuit, each of the fifth sensor first current range, the fifth sensor second current range, the fifth sensor short current range, and the fifth sensor open current range not overlapping with each other; and

a first power supply and a second power supply that provide power to the field sensors, wherein a portion of the field sensors are powered by the first power supply and the remaining field sensors are powered by the second power supply,

wherein the control module includes a first control logic for converting the output current to an output voltage, including a first sensor first output voltage value in a first sensor first voltage range corresponding to the first sensor first output current value, a first sensor second output voltage value in a first sensor second voltage range corresponding to the first sensor second output current value, a first sensor third output voltage value in a first sensor short voltage range corresponding to the first sensor third output current value, and a first sensor fourth output voltage value in a first sensor open voltage range corresponding to the first sensor fourth output current value, each the first sensor first voltage range, the first sensor second voltage range, the first sensor short voltage range, and the first sensor open voltage range not overlapping with each other;

a second sensor first output voltage value in a second sensor first voltage range corresponding to the second sensor first output current value, a second sensor second output voltage value in a second sensor second voltage range corresponding to the second sensor second output current value, a second sensor third output voltage value in a second sensor short voltage range corresponding to the second sensor third output current value, and a second sensor fourth output voltage value in a second sensor open voltage range corresponding to the second sensor fourth output current value, each the second sensor first voltage range, the second sensor second voltage range, the second sensor short voltage range, and the second sensor open voltage range not overlapping with each other;

a third sensor first output voltage value in a third sensor first voltage range corresponding to the third sensor first output current value, a third sensor second output voltage value in a third sensor second voltage range corresponding to the third sensor second output current value, a third sensor third output voltage value in a third sensor short voltage range corresponding to the third sensor third output current value, and a third sensor fourth output voltage value in a third sensor open voltage range corresponding to the third sensor fourth output current value, each the third sensor first voltage range, the third sensor second voltage range, the third sensor short voltage range, and the third sensor open voltage range not overlapping with each other;

a fourth sensor first output voltage value in a fourth sensor first voltage range corresponding to the fourth sensor first output current value, a fourth sensor second output voltage value in a fourth sensor second voltage range corresponding to the fourth sensor second output current value, a fourth sensor third output voltage value in a fourth sensor short voltage range corresponding to the fourth sensor third output current value, and a fourth sensor fourth output voltage value in a fourth sensor open voltage range corresponding to the fourth sensor fourth output current value, each the fourth sensor first voltage range, the fourth sensor second voltage range, the fourth sensor short voltage range, and the fourth sensor open voltage range not overlapping with each other; and

a fifth sensor first output voltage value in a fifth sensor first voltage range corresponding to the fifth sensor first output current value, a fifth sensor second output voltage value in a fifth sensor second voltage range corresponding to the fifth sensor second output current value, a fifth sensor third output voltage value in a fifth sensor short voltage range corresponding to the fifth sensor third output current value, and a fifth sensor fourth output voltage value in a fifth sensor open voltage range corresponding to the fifth sensor fourth output current value, each the fifth sensor first voltage range, the fifth sensor second voltage range, the fifth sensor short voltage range, and the fifth sensor open voltage range not overlapping with each other, and

wherein the control module includes a second control logic for translating the output voltage to a binary bit pattern that indicates if a particular gear selector position is selected, and the bit pattern includes five bits that each have a binary value of either 0 or 1, and the five bits are S, R1, R2, D1 and D2, the control module further including a third control logic for generating a first failure signal indicating an open circuit if the control module receives the fourth output current value from at least one of the first, second, third, fourth, and fifth field sensors, the control module further including a fourth control logic for generating a second failure signal indicating a short circuit if the control module receives the third output current value from at least one of the first, second, third, fourth, and fifth field sensors.

14. The gear selector assembly of claim 13 wherein if the value of the output current indicates one of a short circuit and an open circuit for one of the five bits, the control module includes a fifth control logic for substituting the complement of the binary value for the corresponding bit.

15. The gear selector assembly of claim 13 wherein in the event either the first power supply or the second power supply fans, the bit patterns will not create an incorrect gear selection indication.

16. The gear selector assembly of claim 15 wherein the field sensors corresponding to the bits R1 and D1 are powered by the first power supply and the field sensors corresponding to the bits S, R2 and D2 are powered by the second power supply.

17. The gear selector assembly of claim 15 wherein the binary values for the bits R1 and D1 are complementary to the binary values for the bits R2 and D2.

18. The gear selector assembly of claim 17 wherein the binary values for the bits R1, D1, R2, and D2 are 0011 respectively for a Park gear selector position.

19. The gear selector assembly of claim 17 wherein the binary values for the bits R1, D1, R2, and D2 are 1001 respectively for a Reverse gear selector position.

20. The gear selector assembly of claim 17 wherein the binary values for the bits R1, D1, R2, and D2 are 1100 respectively for a Neutral gear selector position.