Faraday type wireless oxygen sensor

• US 8,078,388 B2
• Filed: 01/07/2009
• Issued: 12/13/2011
• Est. Priority Date: 01/07/2009
• Status: Expired due to Fees

• Current Assignee: Denso International America Incorporated (DENSO Corporation)
• Original Assignee: Denso International America Incorporated (DENSO Corporation)
• Inventors: Powell, Patrick
• Primary Examiner(s): Tran, Khoi
• Assistant Examiner(s): Amin, Bhavesh V
• Application Number:
  US12/349,890
• Publication Number:
  US 20100174455A1
• Time in Patent Office: 1,070 Days
• Field of Search: 73/10.2, 73/10.6, 73 1901- 1912, 73/232, 73 2321- 2335, 733/350.2, 733/350.3, 733/350.4, 733/350.5, 73 3501- 3513, 738/611.1, 738/611.5
• US Class Current: 701/109
• CPC Class Codes: F01N 13/008 Mounting or arrangement of exhaust sensors in or on exhaust apparatus sensor arrangements for engine control F02D41/1439
• CPC Class Codes: F01N 2560/025 for measuring or detecting O2, e.g. lambda sensors
• CPC Class Codes: F02D 41/00 Electrical control of supply of combustible mixture or its constituents F02D43/00 takes precedence ; control of engine starters F02N11/08, electrical control of engine ignition timing F02P5/145
• CPC Class Codes: F02D 41/1454 the characteristics being an oxygen content or concentration or the air-fuel ratio
• CPC Class Codes: F02D 41/28 Interface circuits

Abstract

An oxygen sensor device and method for a motor vehicle having an electrode within an outer shell for measuring oxygen in exhaust gas exiting the vehicle. A communication device, powered by a capacitor, wirelessly transmits the measured amount of oxygen from the electrode to a powertrain control module. Vibration transmitting from the motor vehicle shakes a magnet, wound inside a coil, for generating the electrical current used by the capacitor.

Claims

1. An apparatus utilizing an oxygen sensor for an engine of a motor vehicle, the apparatus comprising:

an outer shell;

an electrode disposed through the outer shell, the electrode for measuring an amount of oxygen in an exhaust gas exiting the motor vehicle and for generating a signal based on the measured amount of oxygen;

a wireless electrode transceiver disposed within the outer shell for wirelessly transmitting the signal from the electrode;

an integrated circuit chip for controlling functions of the oxygen sensor;

a power-storing device within the outer shell to provide power to at least the wireless electrode transceiver and the integrated circuit chip; and

a self-contained power generation device disposed in the outer shell, the power generation device for supplying electrical power to the capacitor.

2. The apparatus of claim 1, further comprising:

a powertrain control module; and

a powertrain control module transceiver, wherein the wireless electrode transceiver wirelessly communicates with the powertrain control module transceiver.

3. The apparatus of claim 1, the self-contained power generation device further comprising:

a movable magnet; and

a coil of wire surrounding the magnet, wherein engine vibration transmitted through the motor vehicle to the self-contained power generation device moves the magnet inside the coil to generate electrical current to energize the power-storing device.

4. The apparatus of claim 3, further comprising:

a heating element inside the oxygen sensor, wherein the heating element supplies conductive level heat to the electrode.

5. The apparatus of claim 4, wherein the power-storing device is a capacitor that supplies electrical current to the heating element.

6. The oxygen sensor of claim 4, wherein the power-storing device is a battery that supplies electrical current to the heating element.

7. The apparatus of claim 6, wherein engine motion generates an electrical current for storage and use by the battery.

8. The apparatus of claim 7, wherein the heating element regulates temperature of the electrode at a conductive level.

9. An oxygen sensor for powering and communicating with a powertrain control module in a motor vehicle, the apparatus comprising:

an outer casing;

an electrode disposed through the outer casing, the electrode for measuring an amount of oxygen in an exhaust gas exiting the motor vehicle and for generating a signal based on the measured amount of oxygen;

a wireless electrode transceiver disposed within the outer casing for wirelessly transmitting the signal from the electrode to the powertrain control module;

a capacitor within the outer casing to provide power to at least the wireless electrode transceiver;

an integrated circuit chip for controlling functions of the oxygen sensor;

a self-contained power generation device disposed in the outer casing, the power generation device for supplying electrical power to the capacitor, the self-contained power generation device further comprising;

a movable magnet; and

a coil of wire surrounding the magnet, wherein engine vibration transmitted through the motor vehicle to the self-contained power generation device moves the magnet inside the coil to generate electrical current to energize the capacitor; and

a powertrain control module transceiver within the powertrain control module, wherein the wireless electrode transceiver wirelessly communicates with the powertrain control module transceiver and the powertrain control module is separate from the oxygen sensor.

10. The apparatus of claim 9, further comprising:

a heating element inside the oxygen sensor.

11. The apparatus of claim 10, further comprising:

an electrical connection to electrically connect the capacitor and the heating element.

12. The oxygen sensor of claim 11, wherein the heating element is proximate to the electrode to supply heat to the electrode.

13. The apparatus of claim 12, wherein the powertrain control module and the (46) communicate wirelessly.

14. An oxygen sensor for powering and communicating with a powertrain control module in a motor vehicle, the apparatus comprising:

an outer casing;

an electrode disposed through the outer casing, the electrode for measuring an amount of oxygen in an exhaust gas exiting the motor vehicle and for generating a signal based on the measured amount of oxygen;

a wireless electrode transceiver disposed within the outer casing for wirelessly transmitting the signal from the electrode to the powertrain control module;

an integrated circuit chip for controlling functions of the oxygen sensor;

a capacitor within the outer casing to provide power to at least the wireless electrode transceiver and the integrated circuit chip;

a Faraday-type power generation device disposed in the outer casing, the power generation device for supplying electrical power to the capacitor; and

a powertrain control module transceiver within the powertrain control module, wherein the wireless electrode transceiver wirelessly communicates with the powertrain control module transceiver and the powertrain control module is separate from the oxygen sensor.

15. The apparatus of claim 14, further comprising:

a vehicle engine exhaust pipe, the power generation device further comprising;

a coil of wire; and

a magnet surrounded by the coil of wire, wherein the coil of wire is mounted to the vehicle engine exhaust pipe such that a longitudinal axis of the coil is perpendicular to the vehicle engine exhaust pipe.

16. The apparatus of claim 15, further comprising:

a heating element inside the oxygen sensor; and

an electrical connection to electrically connect the capacitor and the heating element.

17. The oxygen sensor of claim 16, wherein the heating element is proximate to the electrode to supply heat to the electrode.

18. The apparatus of claim 17, wherein the powertrain control module are wireless communication devices.

19. The apparatus of claim 18, wherein the powertrain control module communicates with the oxygen sensor to recalibrate the oxygen sensor.

20. The apparatus of claim 18, wherein the powertrain control module communicates with the oxygen sensor to conduct diagnostics on the oxygen sensor.