Method and apparatus for controlling a diesel engine

• US 5,601,068 A
• Filed: 03/12/1996
• Issued: 02/11/1997
• Est. Priority Date: 07/05/1995
• Status: Expired due to Fees

• Current Assignee: Nozzle Eng. S.R.L.
• Original Assignee: Nozzle Eng. S.R.L.
• Inventors: Nozaki, Ryoichi
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US08/614,265
• Time in Patent Office: 336 Days
• Field of Search: 123/378, 123/676, 123/568, 123/569, 123/571, 364/431.06
• US Class Current: 123/676
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02D 2041/0017 by simultaneous control of throttle and exhaust gas recirculation
• CPC Class Codes: F02D 2041/0022 for diesel engines by throttle control
• CPC Class Codes: F02D 41/005 according to engine operating conditions
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method and apparatus for controlling a diesel engine to decrease the detrimental compositions of exhaust gas by supplying an appropriate amount of oxygen into the combustion chamber for the burning of the fuel. This is accomplished by a controlling apparatus comprising an exhaust gas recirculating pipe, for recirculating exhaust to an intake pipe, having a recirculated gas temperature sensor and a recirculated exhaust gas throttle valve; an outside air temperature sensor in the intake pipe; a fuel sensor; an engine state sensor; an air calculating section for calculating a required amount of air on the basis of the amount of fuel detected by the fuel sensor and the outside air temperature detected by the outside air temperature sensor; a recirculated gas calculating section for receiving information from the air calculating section and calculating the required amount of recirculated gas on the basis of the output signal from the recirculated gas temperature sensor and the engine state sensor; and a recirculating gas control section for operating the recirculated gas throttle valve in response to the calculated amount of recirculated gas.

Claims

1. A controlling apparatus of a diesel engine for decreasing the detrimental compositions of exhaust gas by supplying an appropriate amount of oxygen for fuel burning comprising:

a recirculating pipe, having a recirculated gas temperature sensor and a recirculated gas throttle valve, for recirculating exhaust gas between exhaust system and intake system;

an intake pipe having an outside air temperature sensor and an outside air throttle valve;

a fuel sensor;

an engine state sensor;

an air calculating section for calculating a required amount of air on the basis of an amount of fuel detected by said fuel sensor and the outside air temperature detected by said outside air temperature sensor,

an outside air introduction control section for operating said outside air throttle valve responding to the calculated required amount of air;

a recirculated gas calculating section for receiving information of the calculated required amount of air and for calculating a required recirculated gas flow rate on the basis of information from said recirculated gas temperature sensor and said engine state sensor; and

a recirculating gas control section for operating said recirculated gas throttle valve responding to the calculated amount of recirculated gas.

10. A controlling apparatus of a diesel engine as claimed in claim 1 or 2, said recirculating pipe is equipped with a cooling means or a radiator for preventing the temperature of said recirculated gas from rising.

11. A controlling apparatus of a diesel engine as claimed in claim 1 or 2, said recirculating pipe is equipped with a particle removing means for removing various particles included in recirculated gas.

2. A controlling apparatus of a diesel engine for decreasing the detrimental compositions of exhaust gas by supplying an appropriate amount of oxygen for fuel burning comprising:

a recirculating pipe, for recirculating exhaust gas between exhaust system and intake side, having a recirculated gas temperature sensor and a recirculated gas throttle valve;

an intake manifold having an outside air temperature sensor;

a fuel sensor;

an engine state sensor;

an air calculating section for calculating a required amount of air on the basis of an amount of the fuel detected by said fuel sensor and the outside air temperature detected by said outside air temperature sensor;

a recirculated gas calculating section for receiving information of the calculated required amount of air and calculating a required amount of recirculated gas on the basis of information from said recirculated gas temperature sensor and said engine state sensor; and

a recirculating gas control section for operating said recirculated gas throttle valve responding to the calculated amount of recirculated gas.

3. A method of controlling a diesel engine, having a recirculating pipe for recirculating exhaust gas between exhaust system and intake side, to supply appropriate amount of oxygen for fuel burning, comprising the steps of:

detecting always recirculated gas temperature in said recirculating pipe, outside air temperature, an engine state and a fuel flow rate;

calculating a required amount of air on the basis of said fuel flow rate and calculating a required recirculated gas flow rate with receiving said required amount of air; and

supplying outside air responded to said required amount of air and required amount of recirculated gas.

4. A method of controlling a diesel engine having a recirculating pipe for recirculating exhaust gas between exhaust system and intake system so as to decrease the detrimental compositions of exhaust gas by supplying appropriate amount of oxygen for fuel burning, comprising the steps of:

detecting always recirculated gas temperature in said recirculating pipe, outside air temperature, an engine state and a fuel flow rate;

calculating a required amount of air on the basis of said fuel flow rate and said outside air temperature, and calculating a required recirculated gas flow rate responding to said recirculated gas temperature and engine state with receiving said required amount of air; and

controlling an outside air flow rate responding to said calculated required amount of air and a recirculated gas flow rate responding to calculated amount of recirculated gas.

5. A method of controlling a diesel engine, having a recirculating pipe for recirculating exhaust gas between exhaust system and intake system, to supply appropriate amount of oxygen for fuel burning, comprising the steps of:

detecting always recirculated gas temperature in said recirculating pipe, outside air temperature, an engine state and a fuel flow rate;

detecting an intake of outside air and calculating the fuel flow rate responded to said intake of outside air, and calculating a required recirculated gas flow rate with receiving said intake of outside air; and

supplying outside air responded to said required amount of air and required amount of recirculated gas.

6. A controlling apparatus of a diesel engine comprising a control table for storing state data of exhaust gas being in a good condition from various sensors, said control table is connected to an outside air introducing control section and/or a recirculating gas control section, and their or its output is connected to an outside air throttle valve and/or recirculated gas throttle valve.

8. A controlling apparatus of a diesel engine as claimed in claim 6, further comprising a table making section for learning and educating exhaust gas conditions by changing various conditions indicated by respective sensors, said control table stores good conditions of exhaust gas learned or educated by the table making section.

7. A method of controlling a diesel engine for supplying appropriate amount of oxygen for fuel burning, comprising the steps of:

storing state data of exhaust gas being in a good condition in a control table; and

operating an outside air throttle valve and recirculated gas throttle valve or only the recirculated gas throttle valve responding the state data in a control table corresponding to various conditions.

9. A method of controlling a diesel engine as claimed in claim 7, further comprising the steps of:

learning and educating exhaust gas conditions by changing various conditions indicated by respective sensors; and

storing consequences of learning and education.