Fuel supplying device for engine

Details Fuel supplying device for engine Fuel supplying device for engine

2000-01-19

2001-04-24

Moulis, Thomas N. (Department: 3747)

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

Reexamination Certificate

active

06220220

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a fuel supplying device for an engine.
2. Description of Earlier Technology
There is known a conventional technique as the fuel supplying device for an engine, which is provided with an electronic governor and a mechanical governor and conducts an electronic control by the electronic governor and a mechanical control by the mechanical governor. The conventional technique is used by switching it over to an electro-solo control mode or to a mecha-solo control mode.
The conventional technique makes a control of speed and a limitation of a maximum fuel injection amount by the electronic control alone in the electro-solo control mode and does them by the mechanical control alone in the mecha-solo control mode.
The above-mentioned conventional technique has the following problems.
The electro-solo control mode has to limit the maximum fuel injection amount of the electronic control by the electronic governor. Therefore, it is necessary to employ an electronic governor having such a limitation function, which results in increasing the cost of the electronic governor. Further, the electronic governor must be adjusted so that it can make such limitation and therefore such an adjustment takes much labor.
SUMMARY OF THE INVENTION
The present invention has an object to provide a fuel supplying device for an engine, which can solve the foregoing problems.
An invention as defined in claim
1
is constructed as follows.
A fuel supplying device for an engine is provided with an electronic governor
1
and a mechanical governor
2
. The mechanical governor
2
is arranged to limit a maximum fuel injection amount of an electronic control by the electronic governor
1
.
An invention of claim
2
is constructed as follows.
A maximum fuel injection position
4
of a fuel metering portion
3
in the electronic control comes to a halfway position of a speed control area
5
of the fuel metering portion
3
. This fuel supplying device automatically switches over the electronic control by the electronic governor
1
to a mechanical control by the mechanical governor
2
and vice versa at the maximum fuel injection position
4
. It performs the electronic control in a fuel decrease side area
5
a
of the speed control area
5
with respect to the maximum fuel injection position
4
and does the mechanical control in a fuel increase side area
5
b
with respect to the maximum fuel injection position
4
.
In the present invention, the electronic control means a speed control conducted based on an electronic speed control line
60
designating an electronic control property. A mechanical control means a speed control conducted based on a mechanical speed control line
51
indicating a mechanical control property. The speed control area
5
means an area of a metering area of the fuel metering portion
3
, in which fuel metering is effected based on at least one of the electronic speed control line
60
and the mechanical speed control line
51
. In the case where the maximum fuel injection position
4
of the fuel metering portion
3
of the electronic control comes to a halfway of the speed control area
5
, the maximum fuel injection position
4
, as a matter of course, is a position where the electronic control switches over to the mechanical control and vice versa.
The invention of claim
1
produces the following function and effect.
The mechanical governor
2
limits the maximum fuel injection amount of the electronic control. This can remove the limitation function from the electronic governor
1
and eventually reduce the cost of the electronic governor
1
. Besides, it is possible to omit or simplify the adjustment of the electronic governor that considers such limitation function and to thereby reduce the labor for its adjustment.
The mechanical governor
2
limits the maximum fuel injection amount of the electronic control. Therefore, in the event that the electronic governor
1
is added to an existing engine with a mechanical governor, which is satisfactory in exhaust gas property, the engine can succeed the satisfactory metering property of the mechanical governor as it is as regards the maximum fuel injection amount of the electronic control. Accordingly, even if the electronic governor
1
is added later to an engine with a mechanical governor, which has cleared the exhaust gas restriction, the engine does not change its exhaust gas property.
Inventions as set forth in claim
2
and subsequent claims produce the following effects and functions in addition to those of the invention as defined in claim
1
.
According to the invention of claim
2
, in a low load area the electronic control decreases an engine rotation speed to reduce the noise of engine and in a high load area the mechanical control can operate the engine with the same feeling as in the case of operating an existing engine with only the mechanical governor.
The invention of claim
3
can select either a composite control mode or an electro-solo control mode whichever is properly adapted to the operation condition and the operation feeling.
The invention of claim
4
can select either the composite control mode or a mecha-solo control mode whichever is properly adapted to the operation condition and the operation feeling. When switching it over to the mecha-solo control mode, it is possible to operate the engine with the same feeling as in the case of operating an existing engine with only the mechanical governor. Further, even if the electronic governor
1
is in disorder, the mechanical governor
2
can operate the engine without causing any problem.
According to the invention of claim
5
, the mechanical governor does not function as a disturbance element in the area
5
a
where the electronic control is performed and the electronic governor
1
does not function as a disturbance element, either in the area
5
b
where the mechanical control is conducted. This produces the following advantage.
It is possible to perform the electronic control and the mechanical control precisely and besides employ low output ones for the electronic governor
1
and the mechanical governor
2
, respectively.
The invention of claim
6
performs the fuel metering by the electronic governor
1
in an engine starting area
7
and therefore can make a delicate control in correspondence to the starting condition.
According to the invention of claim
7
, when the engine starts at a warm time or restarts while it is still warm just after it has stopped, in correspondence to these starting conditions, fuel supply is reduced to result in the possibility of inhibiting the fuel consumption and the discharge of unburnt poisonous gas.
According to the invention of claim
8
, the electronic governor
1
can also serve as an engine stopping device. This dispenses with a circuit and an actuator dedicated for the engine stopping device, which can reduce the cost of engine and make it compact.
According to the invention of claim
9
, when operation failure of the electronic governor
1
has cancelled energizing an actuator
17
, an urging force of a spring
33
forces an electronic output portion
9
to move the fuel metering portion
3
up to a fuel supply stop position
8
and stays it there. Thus restarting the engine is tried in vain, which can confirm the operation failure of the electronic governor
1
.
According to the invention of claim
10
, while the engine is in operation, at loads (L
4
) to (L
1
) below a reference load (L
5
) the electronic governor
1
settles an engine rotation speed lower than the mechanical governor
2
does. This can decrease the noise of engine at partial loads (L
4
) to (L
2
) and no load (L
1
).
Further, the invention of claim
10
can set a steady state rotation speed (NX) of the electronic control at loads (L
4
) to (L
1
) below the reference load (L
5
) to a value identical or close to that of a steady state rotation speed (NX) of the electronic control at the reference load (L
5
). Accordingly, it is possible to keep the wo

Affiliated with

Also associated with

Rating

Fuel supplying device for 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 Fuel supplying device for engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel supplying device for engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2458724