Control apparatus and control method for internal combustion engine

• US 7,228,221 B2
• Filed: 03/29/2006
• Issued: 06/05/2007
• Est. Priority Date: 11/20/2003
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Niimi, Kuniaki
• Primary Examiner(s): KWON, JOHN
• Application Number:
  US11/391,549
• Publication Number:
  US 20060196472A1
• Time in Patent Office: 433 Days
• Field of Search: 701/101, 701/103, 701/104, 123/304, 123/329, 123/339.11, 123/339.12, 123/339.22, 123/339.24, 123/393, 123/402, 123/406.31, 12340644-40648
• US Class Current: 701/104
• CPC Class Codes: F02D 19/0628 Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
• CPC Class Codes: F02D 19/0649 Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
• CPC Class Codes: F02D 19/0665 Tanks, e.g. multiple tanks
• CPC Class Codes: F02D 19/0692 Arrangement of multiple injectors per combustion chamber
• CPC Class Codes: F02D 19/081 Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
• CPC Class Codes: F02D 2200/0611 Fuel type, fuel composition or fuel quality
• CPC Class Codes: F02D 2200/1015 Engines misfires
• CPC Class Codes: F02D 35/027 using knock sensors
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/0025 Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
• CPC Class Codes: F02D 41/1446 the characteristics being exhaust temperatures
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02P 5/152 dependent on pinking detecting or indicating knocks in internal-combustion engines G01L23/22
• CPC Class Codes: F02P 5/1527 with means allowing burning of two or more fuels, e.g. super or normal, premium or regular
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A control apparatus retards ignition timing of the engine, and increases an amount of a fuel supplied to the engine based on a retard amount of the ignition timing, by calculating a maximum engine intake air amount at which an exhaust system temperature can be maintained at or below a predetermined upper limit temperature by increasing the amount of the fuel supplied to the engine without causing a misfire of the engine, and limiting an engine intake air amount to a value no greater than the maximum engine intake air amount.

Claims

1. A control apparatus for an internal combustion engine, compnsing:

a controller that retards ignition timing of the engine, and increases an amount of a fuel supplied to the engine based on a retard amount of the ignition timing, wherein the controller limits a fuel increase amount calculated based on the retard amount of the ignition timing to a maximum fuel increase limit amount at which an exhaust system temperature is maintained at or below a predetermined upper limit temperature without causing a misfire of the engine.

2. The control apparatus according to claim 1, wherein the controller stops supply of the fuel to the engine when the exhaust system temperature exceeds the predetermined upper limit temperature due to an increase in the amount of the fuel supplied to the engine.

3. The control apparatus according to claim 1, wherein the controller retards the ignition timing of the engine based on an octane value of the fuel.

4. The control apparatus according to claim 1, wherein the control apparatus can supply at least two fuels having different octane values to the internal combustion engine in a given proportion, and can change the proportion while the engine is operated;

and the controller retards the ignition timing of the engine based on the proportion.