JPS601366A - Output controller for gas engine - Google Patents

Abstract

PURPOSE:To make a rarefied air-fuel ratio in time of low load and a rich air- fuel ratio in time of high load both attainable, by additionally installing an auxiliary gas feed system provided with a gas valve capable of opening regulation in a constant air-fuel ratio mixture feed system carrying a throttle valve, while interlocking the gas valve with the throttle valve. CONSTITUTION:A constant air-fuel ratio mixture feed system 1 carrying a throttle valve 2 is constituted of a gas-air mixture part 3, a main gas passage 4 and a zero governor 5. In the above constitution, an auxiliary gas feed system 7 carrying a gas valve capable of opening regulation is additionally installed in the said system 1. And, the gas valve 6 gets opening when the throttle valve 2 reaches the specified opening theta0, and simultaneously with an increase in the opening of the throttle valve 2, the valve 6 is made to interlock the valve 2 so as to increase its opening. With this constitution, when a device for a heat pump or the like, for example, comes to high load, the throttle valve 2 is opened more than the specified opening theta0, if so, the gas valve 6 is also opened and thereby auxiliary gas is fed so that an air-fuel mixture to be fed to a gas engine 17 comes to a rich air-fuel ratio, thus the output is increasable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine using gas as fuel, that is, an output control device for a gas engine.

For example, a gas engine to which the Otto cycle is applied can achieve high thermal efficiency and low NOx in exhaust gas by operating at a lean air-fuel ratio, but the output of the engine is reduced. Conversely, if the engine is operated at a rich air-fuel ratio, the output will not be insufficient, but NOx will increase and the thermal efficiency will also decrease.

Therefore, when using such an engine to operate a device such as a heat pump that is operated at low load for most of the operating time but at high load for short periods of time, a lean air-fuel ratio is used at low load and a lean air-fuel ratio at high load. It is effective to operate with a rich air-fuel ratio. Conventionally, an output-side f1 device that can perform such an operation detects 02 in the exhaust gas with a sensor and feeds back the air-fuel ratiotttll? There is a device that increases the cost by +41, but such a device has the disadvantage of a relatively complicated structure and a high price.

The present invention has a configuration in which the air-fuel ratio is adjusted in a very rational manner in conjunction with the operation of the throttle valve that adjusts the output of the engine. This is an extremely simple and inexpensive device that achieves operation at a rich air-fuel ratio. The present invention will be described in detail below based on examples.

Reference numeral 1 indicates a constant air-fuel ratio gas-air mixture supply system provided with a throttle valve 2, and reference numerals 3 and 4.5 indicate the gas-air temperature section, main gas passage, and zero, which constitute the air-fuel mixture supply system 1, respectively. is pana. However, the mixture supply system 1 may have any suitable mixing system and its constituent members as long as it can obtain a gas-air mixture at a constant air-fuel ratio. An auxiliary gas supply system 7'lf is attached to the air-fuel mixture supply system 1, and the gas valve 6 is provided with a gas valve 6 whose opening degree is adjustable, and the gas valve 6 has an opening degree θ of which the throttle valve 2 has a constant Qi.

When the throttle valve 20 reaches 0, the throttle valve 20 starts to open.
The throttle valve 2 is configured to be interlocked with the throttle valve 2 so that the opening degree increases as the opening amount increases.

The embodiment shown in FIG. 1 includes a cylindrical portion 8 and a rod-shaped valve body 10 slidably provided in the cylindrical portion 8 and having an opening adjustment groove 9 formed in a part thereof.
The gas valve 6 is constructed from this, and one end of the interlocking link 13 connected to the operating arm 12 protruding from the rotating shaft 11 of the throttle valve 2 is connected to the rod-shaped valve body 10, and the opening adjustment groove 90 i is connected to the rod-shaped valve body 10. By adjusting the gas valve 6, the throttle valve 2 can be adjusted to a predetermined opening degree θ.
.

When the throttle valve 2 reaches the opening angle θ, it starts to open.
The opening is linked to increase as the opening increases. However, the configuration and interlocking method of the Gas Pulzoro are merely one example, and the type of the gas valve 6, its flow rate characteristics, and interlocking method are arbitrary. For example, as another embodiment, the configuration shown in FIG. 6 is such that the operation l1III] 14 of the rotary gas valve 6' is configured coaxially with the rotating shaft 11 of the throttle valve 2 and interlocked therewith.

Incidentally, although the reference numeral 15 in the figure indicates a gas distribution section and the reference numeral 16 indicates a sub-gas supply section, the positions of the gas distribution section 15 and the sub-gas supply section 16 are not limited to the configuration shown in FIG. For example, it may be configured at the position shown by the imaginary line in FIG. That is, in FIG. 4, the auxiliary gas supply section may be located at either 16, 16' or 16" relative to the position of the gas distribution section 15 (and may also be located at 16" or 16" relative to the position of the auxiliary gas supply section 16. hand,
The gas distribution section may be located at the 15' position.

In the above configuration, the present invention adjusts the opening degree of the throttle valve 2 of the mixture supply system 1 to increase or decrease the amount of gas-air mixture supplied to the gas engine 17.
The output of the gas engine 17 can be set to the open side 1 in response to a still lower load on a device 18 such as a heat pump operated by the gas engine 17. Therefore, the opening degree θ of the throttle valve 2 is 0≦θ≦θ. When the gas valve 6 is in the closed state, the gas engine 17 is closed.
The air-fuel ratio of the mixture supplied to the
The gas engine 1 is held constant as shown in Figure (a).
The output of 7 can be controlled 14j as shown in FIG. 2(b). The air-fuel ratio in such a state is set to 8-purple fuel ratio, and thus the gas engine 17 has high thermal efficiency and low NO.
It is possible to drive in the state x.

However, when the device 18 such as a -C heat pump is under heavy load, the opening degree of the throttle valve 2 is changed to θ.

When the gas valve 6 is opened further, the auxiliary gas is supplied, so the air-fuel mixture supplied to the gas engine 17 has a rich air-fuel ratio, and therefore the output of the gas engine 17 is increased in response to the increase in load. can be done. Except for this, the opening θ of the throttle valve 2 of the Gaspar Zorro 6 is
θ. If it is in the M1□ range of <θ≦900, the opening is increased as the opening of the throttle valve 2 increases, so the air-fuel ratio is shown as an actual result in Fig. 8142 (a) K. As shown in FIG. 2, unlike the state shown by the broken line in which the auxiliary gas supply system 7 is not provided, as the opening degree of the throttle valve 2 is increased, the air-fuel ratio gradually becomes richer, and the output of the gas engine 17 also becomes as shown in FIG. As shown in red in b), it is possible to significantly increase the amount of gas compared to the state shown by the broken line where the auxiliary gas supply system 7 is not provided. Although NOx increases when operating at such a rich air-fuel ratio, there is almost no problem if such operation is infrequent, and NOx can be removed by an appropriate method such as using a three-way catalyst. You can also do it.

As described above, the present invention includes a constant air-fuel ratio gas-air mixture supply system equipped with a throttle valve, and an auxiliary gas supply system equipped with a gas valve whose opening degree can be adjusted, and which operates in conjunction with the throttle valve. By doing so, it is possible to operate the gas engine at a lean air-fuel ratio during low loads to achieve low NOx and high thermal efficiency, and at high loads it is possible to operate at a lean air-fuel ratio to provide sufficient air-fuel ratio to cope with increased loads. It is ideal for operating devices such as heat pumps, which are operated at low dI for most of the time, but are subject to high loads for short periods of time. In particular, since the present invention performs such operation in conjunction with the gas valve and throttle valve as described above, it has a feature that the structure is extremely simple and can be constructed at low cost.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2(a)
, (b) are detailed explanatory diagrams of the present invention, FIG. 6 is an explanatory diagram of the other side of the interlocking mechanism, and FIG. 4 is an explanatory diagram showing another example of construction. Code 1...Mixture supply system, 2...Throttle pallet, 3...Gas-air mixing section, 4...Main gas passage, 5...Zero cabana, 6, 6'... Gas valve, 7.
... Sub-gas supply system, 8... Cylindrical part, 9... Opening adjustment groove, 10... Rod-shaped valve body, 11... Rotation shaft, 12...
...Operating arm, 13...Interlocking link, 14...Operation shaft, 15, 15'...Gas distribution section, 16, 16'
, 16... Sub-gas supply section, 11... Gas engine, 18... Device. Applicant Representative of Small Gas Cooling Technology Research Association Akira Yo Se 1-”41 ・ ・1.j Figure 1 Figure 2 (a) Figure 2 (b) Figure 3

Claims (1)

[Claims] An auxiliary gas supply system equipped with a gas valve whose opening degree can be adjusted is attached to a constant air-fuel ratio gas-air mixture supply system equipped with a throttle valve, and when the throttle valve reaches a predetermined opening degree, An output control device for a gas engine, characterized in that the output control device is configured to operate in conjunction with the throttle valve so that the throttle valve starts to open and increases its opening as the opening of the throttle valve increases.