Internal combustion engine starting apparatus and process

• US 5,713,320 A
• Filed: 01/11/1996
• Issued: 02/03/1998
• Est. Priority Date: 01/11/1996
• Status: Expired due to Term

• Current Assignee: Marathon Engine Systems Incorporated
• Original Assignee: Gas Research Institute (GTI Energy)
• Inventors: Wesenberg, Scott Lee, Pfaff, Joseph Lawrence
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US08/584,062
• Time in Patent Office: 754 Days
• Field of Search: 123/179.1, 123/179.3, 123/179.4, 123/179.25, 123/179.26
• US Class Current: 123/179.3
• CPC Class Codes: F02N 11/006 using a plurality of electric motors
• CPC Class Codes: F02N 11/08 Circuits or control means specially adapted for starting of engines
• CPC Class Codes: F02N 19/005 Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation
• CPC Class Codes: F02N 2019/007 using inertial reverse rotation

Abstract

An apparatus and process for starting internal combustion engines having one to three cylinders by first activating a reverse direction motor to drive the power system of the engine in reverse to its normal operating direction until it is positioned at or near the backside of a prior compression stroke and then activating a starter motor, preferably at initial high torque, and continuing operation until the engine is started. The apparatus and process achieves a significant decrease in the size and power requirements for starters.

Claims

1. A process for starting an internal combustion engine comprising:

activating a reverse direction motor to rotate the crankshaft of a one to three cylinder engine in reverse to its normal operating direction, continuing reverse rotation of said crankshaft until the power system of said engine is at or near the backside of a prior compression stroke, and then deactivating said reverse direction motor and activating a starter motor rotating said crankshaft in its normal operating direction driving said power system of said engine from said backside of said prior compression stroke until said engine is started, said reverse direction motor operating at a power significantly less than the power of said starter motor.

2. A process for starting an internal combustion engine according to claim 1 comprising continuing said reverse rotation of said crankshaft for a preset arc of rotation.

3. A process for starting an internal combustion engine according to claim 1 comprising continuing said reverse rotation of said crankshaft until said reverse rotation is slowed by said prior compression stroke.

4. A process for starting an internal combustion engine according to claim 1 comprising continuing said reverse rotation of said crankshaft to a preset position.

5. A process for starting an internal combustion engine according to claim 1 wherein said activating said reverse direction motor comprises activating said starter motor in reverse to its normal operating direction.

6. A process for starting an internal combustion engine according to claim 1 wherein said activating said reverse direction motor comprises activating a reverse direction motor which is a separate motor from said starter motor.

7. A process for starting an internal combustion engine according to claim 1 wherein said rotating said crankshaft by said starter in said normal operating direction is rapidly accelerated upon its initiation.

8. A process for starting an internal combustion engine according to claim 1 wherein said engine is a single cylinder engine.

9. A process for starting an internal combustion engine according to claim 1 having a single cylinder wherein said activating said reverse direction motor comprises activating said starter motor in reverse to its normal operating direction at a power significantly less than the power of said starter in said normal operating direction and said rotating said crankshaft in said normal operating direction is rapidly accelerated upon its initiation.

10. An apparatus for starting an internal combustion engine comprising:

reverse direction motor means capable of rotating the crankshaft of a one to three cylinder engine in reverse to its normal operating direction, reverse direction motor activating means to activate said reverse direction motor means, reverse direction motor deactivating means to deactivate said reverse direction motor means when the power system of said engine is at or near the backside of a prior compression stroke, and starter motor means capable of rotating the crankshaft of said engine in its normal operating direction driving said power system of said engine from said backside of said prior compression stroke until said engine is started, said reverse direction motor means operating at a power significantly less than the power of said starter motor means.

11. An apparatus for starting an internal combustion engine according to claim 10 further comprising control means for continuing said reverse rotation of said crankshaft for a preset arc of rotation.

12. An apparatus for stating an internal combustion engine according to claim 10 further comprising speed sensing means capable of detecting slowing of said reverse rotation and signalling said reverse direction motor deactivating means upon said determining of slowing.

13. An apparatus for starting an internal combustion engine according to claim 10 further comprising position sensing means capable of determining rotation position of said crankshaft and signalling said reverse direction motor deactivating means upon said crankshaft reaching a preset position at or near the backside of a prior compression stroke.

14. An apparatus for starting an internal combustion engine according to claim 10 wherein said reverse direction motor means comprises means for operating said starter motor means in reverse to its normal operating direction.

15. An apparatus for starting an internal combustion engine according to claim 10 wherein said reverse direction motor means comprises a motor separate from said starter motor means.

16. An apparatus for starting an internal combustion engine according to claim 10 wherein rotating said crankshaft by said starter is rapidly accelerated upon its initiation.

17. An apparatus for starting an internal combustion engine according to claim 10 wherein said engine is a single cylinder engine.

18. In an internal combustion engine starter of the type having starter motor means capable of rotating the crankshaft of said engine in its normal operating direction until said engine is started, the improvement comprising:

reverse direction motor means capable of rotating said crankshaft at a speed significantly less than the speed of rotation of said crankshaft, by said starter in reverse to its normal operating direction to place the power system of said engine at or near the backside of a prior compression stroke and said starter, motor comprising means for providing rapid acceleration upon its activation.