JPS6311305Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an intake air flow rate adjusting device that controls the intake air flow rate in stages during initial idling control at the time of starting a vehicle internal combustion engine.

As a conventional intake air flow rate adjusting device, for example, there is one having a configuration of a thermally variable type as shown in FIG. First, the configuration will be explained. When a power source is connected to a heater B for a thermally deformable body, for example, a bimetal A, to generate heat, the bimetal A deforms and displaces the shutter C in the closing direction, thereby controlling the intake air flow rate. Note that arrow D in the figure indicates the direction of air flow.

However, since these conventional thermally deformable intake air flow rate regulators utilize thermal deformation of bimetals, it is necessary to control the ambient temperature and adjust the mounting position during manufacturing, and there is also a considerable amount of work involved. There were problems in that it required many inspection steps and the bimetal itself was vulnerable to vibration.

This idea was created by focusing on these conventional problems, and instead of using a thermally deformable body as described above, the diameter of the air circulation hole is the same, and the spacer that sets the stroke of the piston is used. The above problem is solved by installing multiple solenoid valves in parallel that have open/close valve mechanisms that have different ventilation areas when fully open due to their different lengths, and use these valves depending on the required intake air flow rate. It is intended to.

This invention will be explained below based on the drawings. Fig. 2 is a perspective view of the solenoid valve portion of an embodiment of this invention, Fig. 3 is a longitudinal sectional view showing the structure of the solenoid valve of Fig. 2, and Fig. 4 is a perspective view of an embodiment of the solenoid valve of this invention. A configuration diagram is shown. In each figure, the same or equivalent parts are given the same reference numerals. First, the configuration of the solenoid valve section will be explained. For convenience of explanation, the inner diameter of the air circulation holes is the same;
As a plurality of solenoid valves having different ventilation areas when the air flow on/off valve mechanism is fully opened, which will be described later, 1
Air flow rate per hour is 3m ³ /hr and 6m ³ /hr, respectively.
Three types of solenoid valves 1 for hr and 15m ³ /hr
An air inlet 3 and an air outlet 4 are provided on opposite sides of the casing 2, one for each. The air inlet 3 is divided into three sides in the casing 2 and connected to air inlets 6 respectively provided in the main body 5 made of a non-magnetic material of the solenoid valve 1. Air conduits (not shown) connected to the provided air outlet 7 are brought together in the housing 2 and connected to the air outlet 4. A mounting flange 9 for a cover 8 that accommodates each member described below is integrally provided on the upper part of the main body 5, and an air flow hole is provided in the center of the flange 9 in order to provide an air flow opening/closing valve mechanism. A piston fitting hole 11 having a diameter slightly larger than the diameter of 10 is bored perpendicularly to the air circulation hole 10, and is penetrated through the air circulation hole 10 and counterbored in the inner wall of the hole on the lower side, into which the piston is fitted. The bottom surface 13 of the piston 12 made of ferromagnetic material is slidably fitted into the hole 11.
When the solenoid valve 1 is fully closed, the counterbore surface 1
Make close contact with 4. In addition, when the solenoid valve 1 is operated and the piston 12 is fully opened when the piston 12 is pulled up, the ventilation area consisting of the bottom surface 13 of the piston 12 and the inner wall surface of the air circulation hole 10 as seen from the direction of the arrow D is as follows per hour. A spacer 15 having a length corresponding to one of the air flow specifications is fixed to the upper end surface of the piston 12. Reference numeral 16 indicates a compression spring inserted between the upper end surface of the piston 12 and the upper inner surface of the cover 8; 17 indicates an excitation coil installed within the cover 8; It is attached to the mounting flange 9 of the cover by means of the mounting means. By attaching the cover 8 in this manner, the excitation coil 17 is fixed between the upper end of the mounting flange 9 of the cover 8 and the upper inner surface of the cover 8. Note that 19 indicates an outlet for the lead wire 20 of the excitation coil 17 provided in the cover 8. Next, the configuration of this embodiment will be explained with reference to FIG. 21 is a water temperature sensor consisting of a temperature sensing element, for example a thermistor, one end of which is grounded and the other end connected to a terminal of a power supply (not shown) via a low resistor 22, the resistance value of which changes depending on the temperature of the cooling water. The terminal voltage signal of the water temperature sensor 21 is input to an arithmetic processing circuit 23, which will be described later. Also, 24 is an air temperature sensor consisting of a temperature sensing element, for example a thermistor, one end of which is grounded and the other end connected to a terminal of a power supply (not shown) via a resistor 25, the resistance value of which changes depending on the ambient temperature. The air temperature sensor 24
A terminal voltage signal of is input to an arithmetic processing circuit 23, which will be described later. Furthermore, the starter 2 is connected to a terminal of a power supply (not shown) via a starter switch 26.
The terminal voltage of No. 7, that is, the starter switch signal, is input to the arithmetic processing circuit 23 described below. Immediately after inputting the starter switch signal, the arithmetic processing circuit 23 calculates the required air flow rate based on the input signal from the water temperature sensor 21 and the input signal from the air temperature sensor 24 for several minutes (approx. This is a circuit that determines whether it is appropriate to run the internal combustion engine for about 5 minutes. 28 is a decoder which inputs the output signal (analog output signal or digital output signal) of the arithmetic processing circuit 23 and outputs a required signal from the output terminal corresponding to the information of the input signal among the plurality of output terminals provided. 29 indicates an output control circuit that controls which specification of the three types of solenoid valves 1 is to be operated based on the input signal from the decoder 28, and 30 indicates the output control circuit, respectively. The output terminal of the circuit 29 and the corresponding excitation coil 1 of each of the above-mentioned solenoid valves 1
This is a conducting wire that connects the lead wire 20 of No. 7.

Next, the effect will be explained. The arithmetic processing circuit 23 is
Immediately after inputting the starter switch signal, the input signal from the water temperature sensor 21 and the air temperature sensor 2
4 is used to determine how many minutes the required air flow rate should be allowed to flow through the internal combustion engine, and its output signal is input to the decoder 28. The decoder 28 outputs the required signal to the output control circuit 29 from an output terminal corresponding to the information of the input signal. The output control circuit 29 operates, based on the input signal from the decoder 28, to operate none of the three types of solenoid valves 1, to operate any one, or to operate any two (two) of the three types of solenoid valves. The above-mentioned air flow opening/closing valve of the required solenoid valve 1 is controlled via the conducting wire 30 by operating the three types (types) in parallel or by operating three types (three types) in parallel. Activate the mechanism. The action of the airflow opening/closing valve mechanism is
More details are as follows. That is, as shown in FIG. 3, when the excitation coil 17 of the solenoid valve 1 is energized through the conducting wire 30 and the lead wire 20, the piston which had closed the air circulation hole 10 due to the elastic force of the compression spring 16 12
However, due to the attractive force of the excitation coil 17, the upper end of the spacer 15 is pulled up until it comes into contact with the upper inner surface of the cover 8. If the air flow rate at this time is set to the three types mentioned above, by using these solenoid valves properly, the air flow rate can be adjusted from 0m ³ /hr to 24m ³ /hr.
Between hr, 0, 3, 6, 9, 15, 18, 21, 24m ³ /
It can be automatically adjusted to 8 levels of hr.

In addition, in the above explanation, for convenience, 3,
Although we have described an example using one solenoid valve with each of three types of air flow specifications of 6 and 15 m ³ /hr, there is no such restriction at all, and the air flow rate per hour can be adjusted to different values as needed. It goes without saying that the intake air flow rate can be controlled in stages by selecting a specific value or by increasing or decreasing the number of units used.

As explained above, according to this idea,
For example, an open/close valve that does not use a thermally deformable body such as a bimetal, but has the same diameter of the air circulation hole, but has a different ventilation area when fully opened by varying the length of the spacer that sets the stroke of the piston. By arranging multiple solenoid valves with mechanisms in parallel and configuring them to be used depending on the required intake air flow rate, there is no need for ambient temperature control or adjustment of the mounting position during the manufacturing process, and inspection man-hours can be shortened. , it is possible to obtain the effect that problems related to vibration can also be eliminated.

Furthermore, there are the following effects. That is, while conventional bimetal heaters required continuous energization, this invention only requires energization during initial idling, resulting in a slight improvement in fuel efficiency. Also, as is commonly thought, it is possible to use several types of solenoid valves with air flow holes of different inner diameters and turn them on and off.
The cost is low because it is not an OFF method, and all you have to do is change the length of the spacer of the solenoid valve with the same structure.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional example, and FIG. 2 is a perspective view of a solenoid valve portion of an embodiment of this invention.
FIG. 3 is a longitudinal sectional view showing the structure of the solenoid valve shown in FIG. 2, and FIG. 4 is a block diagram showing an embodiment of the invention. Explanation of symbols: A... Bimetal, B... Heater, C... Shutter, D... Direction of air flow, 1...
... Solenoid valve, 2 ... Housing, 3, 6 ... Air inlet, 4, 7 ... Air outlet, 5 ... Solenoid valve body, 8 ... Cover, 9 ... Cover mounting flange, 10 ...Air circulation hole, 11...
Piston fitting hole, 12... Piston, 13... Bottom surface of piston, 14... Counterbore surface, 15... Spacer, 17... Excitation coil, 18... Machine screw, 1
9... Lead wire outlet, 20... Lead wire, 2
1...Water temperature sensor, 22, 25...Resistance, 23...
... Arithmetic processing circuit, 24 ... Air temperature sensor, 26
...Starter switch, 27...Starter, 28
... Decoder, 29 ... Output control circuit, 30 ...
Conductor.

Claims (1)

[Scope of utility model registration request] A plurality of air passages having the same passage area are connected in parallel to an intake system of an internal combustion engine, and each air passage is provided with a solenoid valve having a piston, an excitation coil, and a spacer for setting the stroke of the piston, By selecting the length of the spacer, the ventilation area of each air passage when the solenoid valve is in the open state is set, and a means for detecting engine temperature and a means for detecting when the engine is started are provided. The control duration time and air flow rate from the time of startup are calculated according to the detection results of both of the above means,
A stepwise control type intake air flow rate adjusting device comprising a control means for opening and closing each of the solenoid valves according to the calculation results, and adjusting the intake air flow rate after startup in steps.