Combustion engine and method of controlling same

Details Combustion engine and method of controlling same Combustion engine and method of controlling same

1999-09-13

2001-05-15

Kwon, John (Department: 3747)

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

C060S605200

Reexamination Certificate

active

06230682

ABSTRACT:

The present invention relates to a combustion engine and a method of controlling same.
BACKGROUND AND STATE OF THE ART
In order to hasten the warming up of a combustion engine from a cold start, a known practice in the case of diesel engines in heavy vehicles is to increase the pressure in the exhaust system by blocking the exhaust line by means of an exhaust brake damper usually incorporated in the exhaust line of such vehicles.
The resulting increase in the load on the engine makes it reach its normal working temperature more quickly, thereby also reducing the discharge of emissions and of so-called white smoke.
Another known practice is to incorporate a line which connects the inlet and outlet systems of a combustion engine to one another in order to transfer exhaust gases from the outlet system to the inlet system. This line is usually valve-controlled in order to be able to modify according to the operating state of the engine the quantity of exhaust gases fed back to the inlet side of the engine. Exhaust gas feedback, also known as EGR (exhaust gas recirculation), is desirable during certain operating states in order to be able to hold down the engine's combustion temperature and thereby reduce the quantity of emissions from the engine.
Known technology has hitherto been unable, however, to indicate an effective method and device for appreciably reducing exhaust emissions during cold starting of combustion engines, particularly in the case of diesel-type combustion engines.
OBJECT OF THE INVENTION
The object of the invention is to provide a method and a device which appreciably reduce exhaust emissions during cold starting of combustion engines, particularly in the case of diesel-type combustion engines.
The solution has to be simple, economic and operationally reliable.
SUMMARY OF THE INVENTION
The object of the invention is achieved by holding the EGR valve open and the exhaust brake in a throttling position to throttle the exhaust gas flow so long as the engine, during a starting period, has not reached a steady operating state. Controlling an exhaust brake valve and an EGR valve in the manner therein indicated makes it possible to shorten appreciably the time the engine takes to reach a steady operating state from a cold start. A corresponding decrease in the discharge of emissions follows therefrom.
A simple solution according to the invention is also achieved by using the sensor signals already available in the case of an electronically controlled engine which represent parameters referring to fuel input quantity, engine speed and the likewise monitored parameter which represents the vehicle's speed. Further reduction of emissions can be achieved by controlling opening and closing of valves in dependence of the number of turns during starting of the engine.
Other features and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings.


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