Vehicle ignition system using ignition module with reduced heat generation

• US 6,889,675 B2
• Filed: 09/24/2003
• Issued: 05/10/2005
• Est. Priority Date: 10/29/2002
• Status: Expired due to Fees

• Current Assignee: Wetherill Associates Incorporated
• Original Assignee: Wetherill Associates Incorporated
• Inventors: Morrissette, Gary E., Browning, Reginald L.
• Primary Examiner(s): MOHANTY, BIBHU R
• Application Number:
  US10/669,754
• Publication Number:
  US 20040080893A1
• Time in Patent Office: 594 Days
• Field of Search: 123/609, 123/630, 123/623, 123/594, 123/612, 123/395, 123/406.12
• US Class Current: 123/594
• CPC Class Codes: F02P 7/035 without mechanical switching means
• CPC Class Codes: F02P 7/07 Hall-effect pick-up devices

Abstract

An ignition system for a vehicle includes a distributor having with a Hall Effect stator assembly and ignition module formed preferably as a thick film integrated (TFI) module, which receives a spark output (SPOUT) signal from an electronic control assembly (ECA). The ignition module includes a microprocessor for generating a control signal to an ignition coil and switching ON and OFF the primary current therein. A temperature sensing circuit is operative with the microprocessor for reducing the duty cycle or overall current or power as applied to the control signal from the TFI ignition module to the ignition coil and reducing the heat generated by the TFI ignition module when a temperature threshold for the TFI ignition module has been exceeded.

Claims

1. A method of operating an ignition system of a vehicle having an electronic engine control (EEC) comprising the steps of:

monitoring the temperature of an ignition module that receives a spark output (SPOUT) signal from an electronic control assembly (ECA) and generates a control signal to an ignition coil for switching ON and OFF the primary current therein; and

reducing the duty cycle as applied to the control signal from the ignition module to the ignition coil and reducing the heat generated by the ignition module when a temperature threshold for the ignition module has been exceeded.

2. A method according to claim 1 and further comprising the step of generating the control signal from a microprocessor positioned within the ignition module.

3. A method according to claim 1 and further comprising the step of generating a profile ignition pickup (PIP) signal indicative of a crankshaft position and engine RPM to the electronic control assembly (ECA).

4. A method according to claim 1 and further comprising the step of mounting the ignition module on a distributor of the vehicle.

5. A method according to claim 1 and further comprising the step of reducing the duty cycle from about 5% to about 15%.

6. A method according to claim 1 and further comprising the step of transmitting a profile ignition pickup (PIP) signal to the ignition module.

7. A method according to claim 1 and further comprising the step of comparing the spark output (SPOUT) signal with a profile ignition pickup (PIP) signal within the ignition module to determine a timing interval for switching ON and OFF the primary current within the ignition coil.

8. A method according to claim 1 and further comprising the step of sensing temperature within the ignition module for determining when the temperature threshold for the ignition module has been exceeded.

9. A method according to claim 1 and further comprising the step of sensing current within a temperature sensing circuit for determining when the temperature threshold has been exceeded.

10. A method according to claim 9 wherein the temperature sensing circuit comprises a temperature sensing resistor.

11. A method according to claim 10 and further comprising the step of rectifying a signal that passes through the temperature sensing resistor using a reference diode for establishing a temperature control signal to the microprocessor that is linear with temperature change in the ignition module.

12. A method of operating an ignition system of a vehicle having an electronic engine control (EEC) comprising the steps of:

monitoring the temperature of an ignition module that receives a signal from an electronic control assembly (ECA) and generating a control signal to an ignition coil for switching ON and OFF the primary current therein; and

reducing the duty cycle as applied to the control signal from the ignition module to the ignition coil and reducing the heat generated by the ignition module when a temperature threshold for the ignition module has been exceeded.

13. A method according to claim 12 and further comprising the step of generating the control signal from a microprocessor positioned within the ignition module.

14. A method according to claim 12 and further comprising the step of generating a profile ignition pickup (PIP) signal indicative of a crankshaft position and engine RPM to the electronic control assembly (ECA).

15. A method according to claim 12 and further comprising the step of mounting the ignition module on a distributor of the vehicle.

16. A method according to claim 12 and further comprising the step of reducing the duty cycle from about 5% to about 15%.

17. A method according to claim 12 and further comprising the step of transmitting a profile ignition pickup (PIP) signal to the ignition module.

18. A method according to claim 12 and further comprising the step of comparing the spark output (SPOUT) signal with a profile ignition pickup (PIP) signal within the ignition module to determine a timing interval for switching ON and OFF the primary current within the ignition coil.

19. A method according to claim 12 and further comprising the step of sensing temperature within the ignition module for determining when the temperature threshold for the ignition module has been exceeded.

20. A method according to claim 12 and further comprising the step of sensing current within a temperature sensing circuit for determining when the temperature threshold has been exceeded.

21. A method according to claim 20 wherein the temperature sensing circuit comprises a temperature sensing resistor.

22. A method according to claim 21 and further comprising the step of rectifying a signal that passes through the temperature sensing resistor using a reference diode for establishing a temperature control signal to the microprocessor that is linear with temperature change in the ignition module.

23. A method of operating an ignition system of a vehicle having an electronic engine control (EEC) comprising the steps of:

generating a control signal from a microprocessor positioned within an ignition module to an ignition coil for switching ON and OFF the primary current therein; and

reducing the duty cycle as applied to the control signal from the microprocessor to the ignition coil and reducing the heat generated by the ignition module when a temperature threshold for the ignition module has been exceeded.

24. A method according to claim 23 and further comprising the step of mounting the ignition module in a housing.

25. A method according to claim 23 and further comprising the step of generating a profile ignition pickup (PIP) signal indicative of a crankshaft position and engine RPM to the electronic control assembly (ECA).

26. A method according to claim 23 and further comprising the step of mounting the ignition module on a distributor of the vehicle.

27. A method according to claim 23 and further comprising the step of reducing the duty cycle from about 5% to about 15%.

28. A method according to claim 23 and further comprising the step of transmitting a profile ignition pickup (PIP) signal to the ignition module.

29. A method according to claim 23 and further comprising the step of comparing the spark output (SPOUT) signal with a profile ignition pickup (PIP) signal within the ignition module to determine a timing interval for switching ON and OFF the primary current within the ignition coil.

30. A method according to claim 23 and further comprising the step of sensing temperature within the ignition module for determining when the temperature threshold for the ignition module has been exceeded.

31. A method according to claim 23 and further comprising the step of sensing current within a temperature sensing circuit for determining when the temperature threshold has been exceeded.

32. A method according to claim 31 wherein the temperature sensing circuit comprises a temperature sensing resistor.

33. A method according to claim 32 and further comprising the step of rectifying a signal that passes through the temperature sensing resistor using a reference diode for establishing a temperature control signal to the microprocessor that is linear with temperature change in the ignition module.