Internal-combustion engines – Engine speed regulator – Responsive to deceleration mode
Patent
1996-03-07
1997-12-23
Solis, Erick R.
Internal-combustion engines
Engine speed regulator
Responsive to deceleration mode
123527, 123 27GE, F02D 906
Patent
active
056997671
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1 Field of the Invention
The present invention relates to a gas engine, and more particularly to a control system for an exhaust retarder of an engine to which a mixer and a throttle valve are connected, after a fuel shut-off valve which is positioned after a compressed natural gas (hereinafter referred to as "CNG" ) cylinder and wherein an intake pipe is connected with a by-pass passage to bypass the mixer and throttle valve. The present invention also relates to an exhaust retarder system of the engine including an exhaust shutter on an exhaust pipe. The present invention further relates to a mixing system of a natural gas engine wherein there are provided a mixer and throttle valve on an intake passage and there is also provided a fuel gas passage extending from a natural gas cylinder to said mixer through a fuel shut-off valve.
2 Description of the Prior Art
A general diesel engine is provided with an exhaust retarder system to improve the performance of decreasing the vehicle speed but, it has not been popular for the CNG engine in the art taught. One of the typical conventional CNG engine is using the fuel feed system in a gas engine, is filed by the same applicant in Japanese Utility-model Application Laid-open No. Sho 60-92742.
It is well known in the art that a big vehicle is generally provided with an exhaust retarder by providing an exhaust shutter on the exhaust pipe to improve the performance of decreasing the vehicle speed.
One of the conventional fuel feed systems of the gas engine is shown in FIG. 9 in which fresh air through the intake passage 01 and gas fed from the gas cylinders 02 through a fuel shut-off valve 07 and a regulator 08, are mixed in a mixer 04 at confluence thereof, and the mixture is fed into the engine OE through an intake manifold 05. When the vehicle shifts its running mode from a normal mode to a deceleration mode, a throttle 6 is closed and the fuel shut-off valve 07 is also closed to interrupt the supply of fuel gas. The aforementioned Japanese Utility-model Application Laid-open No. Sho 60-92742 also teaches similar technology.
However, in Japanese Utility-model Application Laid-open No. Sho 60-92742 of which the content has already been explained, there can not be seen any technology relating to an exhaust retarder system. A premixed engine, which has a mixer and a throttle valve positioned after the CNG cylinders and a fuel shut-off valve, also has a by-pass passage skipping the mixer and the throttle valve to an intake pipe, and is also known in the art to control an air/fuel ratio preferably corresponding to the actual driving conditions, but if an exhaust retarder is additionally provided to close a shutter for the exhaust gas, a back fire problem took place. Particularly, in a CNG engine remodeled from a general diesel engine, a business vehicle carrying much luggage could not obtain sufficient performance to decrease its speed, which might cause a traffic accident.
In the premixed engine which sucks therein a mixture with fuel and fresh air such as a gas engine, an installation of such an exhaust retarder is not common because even if an exhaust shutter is provided, some mixture remains in an intake pipe after the fuel valve is closed, whereby a back fire takes place. In a gas engine remodeled from the diesel engine, the deceleration of the vehicle carrying much luggage is not substantially sufficient to assure driving safety.
As known from FIG. 9, an inside volume of fuel in the fuel gas passage 03 from the fuel shut-off valve 07 to the mixer 04 is large, therefore the fuel gas stored therein may be wasted when released from the exhaust pipe through the engine OE. Besides, when the vehicle returns to the normal mode, it takes some time for the feeding fuel gas from the fuel shut-off valve to the engine, which causes an insufficient response to a change in speed.
SUMMARY OF THE INVENTION
The present invention is conceived after reviewing the above-mentioned inferior conventional technology.
Accordingly, it is an object of the p
REFERENCES:
patent: 4835963 (1989-06-01), Hardy
patent: 5150678 (1992-09-01), Wittmann et al.
patent: 5251602 (1993-10-01), Kurihara
patent: 5282399 (1994-02-01), Sano et al.
patent: 5337722 (1994-08-01), Kurihara
patent: 5370098 (1994-12-01), Iida
patent: 5483927 (1996-01-01), Letang et al.
patent: 5529048 (1996-06-01), Kurihara et al.
patent: 5549097 (1996-08-01), Nimberger
Hamazaki Nobuo
Matsuda Hiroshi
Miyata Tatsuji
Nakamura Akira
Notsu Ikurou
Nissan Diesel Motor Co., Ltd.
Solis Erick R.
LandOfFree
Gas engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1795061