JPH041467A - Fuel controller - Google Patents

Abstract

PURPOSE:To relieve the effect of engine backfire as well as to prevent a carbon particle and an oil mist from penetrating in, and sticking to an intake control mechanismic part by setting up plural pieces of discontinuous throttles in and around an air outlet of a bypass passage. CONSTITUTION:An air flow sensor 3, measuring an intake air quantity, and an injector 4 spraying fuel both are installed in an intake passage body 1 on one side, and a throttle valve 5 controlling an air quantity is installed in an intake passage body 2 on the other. A part of intake air is taken out of an upper passage 6 of the throttle valve 6, and it is inducted to the downstream of the throttle valve 5 by way of an intake control mechanismic part 7 via a passage 8. In this case, each throttle 9 is discontinuously set up in this passage 8. When gas is spat back from the side of an engine due to a backfire or the like, a flow velocity of the spitting gas is largely varied by the throttles, and thereby such a possibility that a carbon particle, an oil mist or suchlike might be reached to the intake control mechanismic part 7 is prevented from occurring.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a fuel injection device that communicates the upper and lower parts of a throttle valve and has a mechanism for controlling an intake flow path in the middle of the communicating passage. This invention relates to a fuel injection control device suitable for preventing characteristic deterioration and inoperability of a control mechanism.

[Conventional technology]

Conventional devices do not take into consideration the intrusion of blow-by gas, etc., as described in Japanese Patent Laid-Open No. 63-100268.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the fact that carbon from the engine blowback, oil mist from blow-by gas, etc. enters and adheres to the air intake control mechanism section provided between the bypass passages, and the characteristics of the intake control mechanism are not considered. Deterioration 9 There was a problem that led to decreased operation.

An object of the present invention is to prevent the above-mentioned problems by providing a plurality of throttles near the air outlet of the bypass passage to make it difficult for carbon particles and oil mist to enter.

[Means to solve the problem]

The above purpose is to arrange a plurality of discontinuous throttles near the air outlet of the bypass passage to soften the effect of engine blowback and to prevent carbon particles and oil mist from entering and adhering to the intake control mechanism. This is achieved by

[Effect]

When the blowback from the engine reaches the outlet of the bypass passage, its flow velocity changes each time it passes through multiple discontinuous throttles, so carbon particles and oil in the blowback gas gradually accumulate on the throttle. .

Therefore, carbon particles and the like do not reach the intake control mechanism.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an electronically controlled fuel injection system. This device is
Intake passage body (A)1. (B) 2 is the main body, and the intake passage body (A) 1 is an air flow sensor 3 that measures the amount of intake air.
, has an injector 4 for injecting fuel, and has an intake passage body (B) 2
has a throttle valve 5 for controlling the amount of air. A portion of the intake air is taken in from the upper passage (A) 6 of the throttle valve 5, passes through the intake control mechanism section 7 provided midway through the passage, passes through the passage (B) 8, and is introduced downstream of the throttle valve 5. The intake control mechanism section 7 operates when the engine is idling and when it is necessary to increase the engine speed due to electrical load, air conditioner load, etc., and controls the upper and lower passages (A) and (B) 6.8 of the throttle valve 5. Open to supply the required amount of air to the engine.

In the passage (B) 8, throttles 9 are arranged discontinuously. 6. The operation of the present invention having the above configuration will be explained.6 The bypass passage system is mainly used to control idle operation, but for example, in the case of an air conditioner load, the bypass passage system is constantly used from idle operation to high-speed operation. 6 and 8 are in an open circuit state. Therefore, when gas from the engine side is blown back due to backfire or the like, it directly hits the outlet 10 of the air passage 8 adjacent to the intake manifold. At this time, the flow velocity of the gas that is injected changes greatly due to the throttle 9 provided in the air passage 8, and further changes the flow direction as it advances to the discontinuously arranged throttles 9', so the flow velocity of the gas changes further and becomes slower. .

Due to this change in gas flow velocity and flow direction, carbon particles, oil mist, etc. present in the gas are deposited before and after the aperture 9a'. If the aperture 9 is made narrower, the ventilation resistance increases, so if the aperture 9 is installed in multiple places, the diameter of the aperture 9 can be set larger, and the ventilation resistance will be reduced, rather than installing it in one place. Therefore, if the apertures 9 are provided at multiple locations, carbon particles will be removed.

It is difficult for oil mistakes etc. to reach the intake control mechanism section 7.

Therefore, there is less adhesion of carbon particles and oil mist to the valve seat 11 and valve 12 of the intake control mechanism section 7, and there is no deterioration of characteristics. Furthermore, since the sliding portion 13 of the valve 12 is similarly free of adhesion of carbon particles and oil mist, problems such as the valve 12 not being able to operate do not occur.

Next, another embodiment will be explained with reference to FIG.

No. 111 (Similar to the 71st method, after reaching the bypass air outlet 10, the gas blown back from the engine is blocked by a throttle 15 installed next to the guide vibe 14 so that it cannot directly enter the passage 8. , changes the direction of the gas flow and reduces the flow velocity due to the throttling effect.This reduces the carbon particles in the gas.

It can drop oil mist, etc. Therefore, the amount of carbon particles, oil mist, etc. reaching the intake control mechanism section 7 is extremely small, and there is no fear of problems such as deterioration of characteristics.

〔Effect of the invention〕

According to the present invention, since there is little intrusion of carbon particles, oil mist, etc. into the intake control mechanism section provided in the bypass intake system, problems such as deterioration of its characteristics and inoperability can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an electronically controlled fuel injection system showing an embodiment of the present invention, and FIG. 2 is a diagram showing another embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. An intake passage that supplies air to the engine, a throttle valve provided in the intake passage, an injector located upstream of the throttle valve that supplies fuel into the intake passage, and air in the intake passage. In a fuel control device that has an air flow sensor that measures the flow rate, a mechanism that communicates the upper and lower parts of the throttle valve, bypasses a portion of the intake air, and controls the amount of intake air, and whose intake outlet is affected by blowback from the engine. , a fuel control device characterized in that a plurality of throttles are provided in an outlet passage for bypass air. 2. The fuel control device according to claim 1, wherein the plurality of throttles provided in the air outlet passage are arranged discontinuously.