Engine control device

• US 20030139872A1
• Filed: 06/11/2002
• Published: 07/24/2003
• Est. Priority Date: 06/15/2001
• Status: Active Grant

• Current Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Original Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Inventors: Miki, Akira
• Granted Patent: US 6,704,640 B2
• Time in Patent Office: Days
• US Class Current: 701/104
• CPC Class Codes: F02D 19/024 by controlling fuel injectors
• CPC Class Codes: F02D 19/061 by controlling fuel injectors
• CPC Class Codes: F02D 19/0647 the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
• CPC Class Codes: F02D 2400/11 After-sales modification devices designed to be used to modify an engine afterwards
• CPC Class Codes: F02D 41/0027 the fuel being gaseous non-electrical control F02D19/02
• CPC Class Codes: F02D 41/266 the computer being backed-up or assisted by another circuit, e.g. analogue
• CPC Class Codes: F02D 41/34 with means for controlling injection timing or duration
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

To simplify a constitution of an engine control device operated using-another fuel different from a predetermined fuel. The engine control device includes: a main computer 1 to output a signal on the supposition that the predetermined fuel is used; and a sub computer 2 to calculate and output only an injection signal on the supposition that another fuel is used. The sub computer conducts injection control on another fuel according to the injection signal or ignition signal outputted from the main computer and further according to the output of a sensor. Control, except for injection control, is conducted according to a signal outputted from the main computer.

Claims

1. An engine control device comprising:

a main computer for controlling an engine which outputs an ignition signal and injection signal according to an output signal of a sensor on the supposition that predetermined fuel is used for the engine; and

a sub computer for outputting an injection signal according to a signal outputted from the main computer on the supposition that another fuel different from the predetermined fuel is used for the engine.

2. An engine control device according to claim 1, wherein the sub computer generates the injection signal by calculating the injection timing and injection amount according to the injection signal outputted from the main computer.

3. An engine control device according to claim 2, wherein the sub computer calculates the injection timing and injection amount according to a falling edge of the injection signal.

4. An engine control device according to claim 2, wherein the sub computer calculates the injection timing and injection amount according to a rising edge of the injection signal.

5. An engine control device according to claim 1, wherein the sub computer generates the injection signal by calculating the injection timing and injection amount according to the ignition signal outputted from the main computer.

6. An engine control device according to claim 1, wherein the sub computer generates the injection signal by calculating the injection timing and injection amount according to the signal outputted from the crank angle sensor and the injection signal for one cylinder outputted from the main computer.

7. An engine control device according to claim 1, wherein the sub computer generates the injection signal by calculating the injection timing and injection amount according to the signal outputted from the crank angle sensor and also according to the ignition signal for one cylinder outputted from the main computer.

8. An engine control device according to claim 1, wherein the sub computer generates the injection signal by calculating the injection timing and injection amount according to the injection signal for one cylinder outputted from the main computer and also according-to the ignition coil signal.