JPH04116218A - Internal combustion engine - Google Patents

Abstract

PURPOSE:To eliminate pollutive substances from an stage through a purifying catalyst by supplying fuel only to a burner by means of a fuel adjustor, supplying air only to an engine, and igniting the burner by means of a burner igniter for combustion. CONSTITUTION:A controller 17 controls an engine 7 so as to generate a specified power. A temperature of a purifying catalyst 11 is detected by means of a temperature sensor 13. When the temperature of the purifying catalyst 11 is a specified value or less, fuel is supplied only to a burner 15 by means of a fuel adjuster 14 which adjusts fuel branched from a fuel supplier 4. To an engine 7 air alone is supplied, and then the burner 15 is ignited by a burner igniter 16 for combustion. Control is so carried out as to start the engine 7 after the temperature of the purifying catalyst 11 is increased to a predetermined value. In this way, the temperature of the purifying catalyst 11 has been increased from the starting time of the engine 7, so that increase of HC or the like is suppressed. In addition, pollutive substances such as NOx, CO are eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an internal combustion engine that obtains power by burning fuel such as petroleum, and relates to control that achieves lower pollution.

Conventional technology Figure 3 shows a conventional internal combustion engine, where l is an air cleaner and 2 is an air cleaner.
is a carburetor, 3 is a fuel tank, 4 is a fuel supply device, 5 is an intake passage, 6 is an intake valve, 7 is an engine, 8 is a piston, 9 is an engine igniter, 10 is an exhaust valve, 11 is a purification catalyst, 12
is the exhaust passage.

Fuel supplied from the fuel tank 3 by the fuel supply device 4 is vaporized by the carburetor 2, and then mixed with air from which dust has been removed by the air cleaner 1. The air-fuel mixture is guided to the intake passage 5, and explodes and burns in the engine 7, which includes an intake valve 6 that controls intake air, an exhaust valve 10 that controls exhaust air, an engine igniter 9 that ignites the air-fuel mixture, and a piston 8 that transmits power. . The exhaust gas is guided to the exhaust passage 12, and is purified by the purification catalyst 11 installed in the exhaust passage 12, which purifies the exhaust gas.
o, CH, etc. were removed.

Problems to be Solved by the Invention However, in such a conventional internal combustion engine, as shown in FIG.
In the situation where purification catalyst 1 is generated, as shown by the solid line,
There was a problem in that a large amount of HC was generated at an early stage when the temperature of No. 1 had not yet risen. The object of the present invention is to remove pollutants from the time the engine is started.

Means for Solving the Problems In order to solve the above problems, the present invention provides an air cleaner that removes dust from the air, a fuel supply device that supplies fuel from a fuel tank, and a vaporizer that vaporizes fuel and mixes it with air. An engine consisting of an intake passage that guides the air-fuel mixture, an intake valve that controls the intake air, an exhaust valve that controls the exhaust air, an engine igniter that ignites the air-fuel mixture, and a piston that transmits power, an exhaust passage that guides the exhaust gas, and an exhaust valve that controls the air-fuel mixture. A purification catalyst installed in the passage to purify exhaust gas, a temperature detector to detect the temperature of the purification catalyst,
a fuel regulator that adjusts the fuel branched from the fuel supply device;
A burner that burns the fuel guided by the fuel regulator, a burner igniter that ignites the burner, and the engine is controlled to generate a predetermined power, and the fuel regulator supplies fuel only to the burner before starting the engine. The supply engine is equipped with a controller that controls the supply of only air and starts the engine after raising the purification catalyst to a predetermined temperature.

After the fuel supplied from the working fuel tank by the fuel supply device is vaporized by the vaporizer, it is mixed with air from which dust has been removed by the air cleaner. The air-fuel mixture is introduced into an intake passage, and explodes and burns in an engine that includes an intake valve that controls intake air, an exhaust valve that controls exhaust air, an engine igniter that ignites the air-fuel mixture, and a piston that transmits power. Exhaust gas is guided into the exhaust passage,
It passes through a purification catalyst installed in the exhaust passage. The controller is
In addition to controlling the engine to generate a predetermined amount of power, a temperature sensor detects the temperature of the purification catalyst, and when the temperature of the purification catalyst is below a predetermined value, fuel adjustment adjusts the fuel branched from the fuel supply device. By supplying fuel only to the burner by the device, and supplying only air to the engine, and igniting the burner with the burner igniter to cause combustion, the purification catalyst is raised to a predetermined temperature in a very short time, and then the engine is started. Control to start. At this time, the purification catalyst is
It becomes possible to remove pollutants such as OX SCo and CH.

Embodiment An embodiment of an internal combustion engine according to the present invention will be explained with reference to FIG. 1 and FIG. 2. In FIG. 1, 13 is a temperature sensor, 14 is a fuel regulator, 15 is a burner, 16 is a burner igniter, 17
is the controller. Further, FIG. 2 shows the HC generation situation, where the solid line shows the HC generation situation with respect to the conventional internal combustion engine, and the dotted line shows the HC generation situation with respect to the internal combustion engine of the present invention.

After fuel supplied from a fuel tank 3 by a fuel supply device 4 is vaporized by a vaporizer 2, it is mixed with air from which dust has been removed by an air cleaner 1. The air-fuel mixture is guided to the intake passage 5, and explodes and burns in the engine 7, which includes an intake valve 6 that controls intake air, an exhaust valve lO that controls exhaust air, an engine igniter 9 that ignites the air-fuel mixture, and a piston 8 that transmits power. . The exhaust gas is guided to the exhaust passage 12 and passes through a purification catalyst 11 installed in the exhaust passage 12. The controller 17 controls the engine 7 to generate a predetermined power, and also detects the temperature of the purification catalyst 11 with the temperature detector 13.
1 is below a predetermined value, the fuel regulator 14 that adjusts the fuel branched from the fuel supply device 4 supplies fuel only to the burner 15, the engine 7 supplies only air, and the burner igniter 16 By igniting and burning the burner 15, the purification catalyst 11 is raised to a predetermined temperature, and then the engine 7 is controlled to be started. At this time, since the temperature of the purification catalyst 11 has increased since the start of the engine 7, the increase in HC etc. is suppressed as shown by the broken line in FIG. At the same time, pollutants such as NOX and CO are removed, making a major contribution to global environmental conservation.

Depending on the type of purification catalyst 11, the set value for temperature rise and the combustion amount of burner 15 need to be set appropriately.
Since the burner 15 can have a larger capacity than the electric heater, it is easy to set the engine 7 to start in 20 seconds or less for convenience.

Furthermore, if a starting timer is incorporated into the controller 17 and the purification catalyst 11 is controlled to be maintained at a predetermined temperature at a desired time, the engine 7 can be started immediately.

Effect of the invention With the above-described configuration, the present invention has the following effects.

(1) Since the engine is started after the purification catalyst is raised to a predetermined temperature, pollutants can be removed from the beginning.

(2) Since a high-capacity burner is used to raise the temperature of the purification catalyst, the engine can be started in a short time.

(3) A start timer allows the engine to be started immediately at a desired time.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing the HC generation situation of the present invention and a conventional example.
FIG. 3 is a block diagram of a conventional internal combustion engine. 7...Engine, 11...Purification catalyst,
12... Exhaust passage, 13... Temperature detector, 14... Fuel regulator, 15... Burner, 16... Burner ignition Instrument, 17. Old...Controller. Agent's name Patent attorney Akira Odakaji Haga 2 people Ku Engine fl-Okika Kanpai/2--Exhaust combination/3-'rLK record 4 14-Fuuchi G4 temporary device No. 2 Figure 17 - %'1 Kenkatsu Midorizaki P, Li (Kyuyi)

Claims (2)

[Claims] (1) An air cleaner that removes dust from the air, a fuel supply device that supplies fuel from the fuel tank, a carburetor that vaporizes the fuel and mixes it with air, an intake passage that guides the air-fuel mixture, and an intake valve that controls the intake air. An engine consisting of an exhaust valve that controls exhaust, an engine igniter that ignites the air-fuel mixture, and a piston that transmits power, an exhaust passage that guides exhaust gas, and a purification catalyst that purifies the exhaust gas that is installed in this exhaust passage. A temperature detector that detects the temperature of this purification catalyst, a fuel regulator that adjusts the fuel branched from the fuel supply device, a burner that combusts the fuel guided from this fuel regulator, and a burner ignition that ignites this burner. In addition to controlling the engine to generate a predetermined power, the fuel regulator controls the supply of fuel to the burner and air to the engine before starting the engine, and brings the purification catalyst to a predetermined temperature. and a controller for controlling the engine to start after the engine is raised. (2) The internal combustion engine according to claim 1, wherein a start timer is incorporated into the controller and the purification catalyst is controlled to be maintained at a predetermined temperature at a desired time.