JPS6321713Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for improving startability when starting an engine at high temperatures.

Under high-temperature conditions such as summer, if the engine is stopped and left after driving, the fuel in the carburetor will evaporate abnormally and fill the intake system passage, and when the engine is restarted at high temperature, the evaporated fuel along with the air-fuel mixture will rush into the engine at once. Since it is sucked into the combustion chamber, there is a problem in that the air-fuel mixture becomes too rich, leading to problems such as ignition errors.

For this reason, conventionally, an air introduction passage that opens downstream of the throttle valve in the intake passage is provided, and this passage is opened and closed in conjunction with the starter circuit with a thermoswitch interposed, to supply a certain amount of new air at the time of high-temperature startup. A hot start enhancement device has been proposed. (Publication of Utility Model Publication No. 55-10597, page 1, right column, line 8 to
line 12).

However, this prior art requires the provision of an expensive thermoswitch such as a thermostatic operated valve, leading to a problem of increased costs.

The present invention provides a high-temperature starting improvement device for an engine that can take measures against evaporated fuel in substantially the same way as the prior art without using an expensive thermoswitch, thereby reducing the cost of manufacturing the device. The purpose is to

In order to achieve this objective, the present invention places an electromagnetic on-off valve at a suitable location in the air introduction passage that opens into the intake passage downstream of the throttle valve, and it is linked to the heater control lever and closes only when this lever is on the cool side. A lever interlocking contact is provided, and a starter circuit or an ignition circuit with a timer circuit is connected to the electromagnetic on-off valve via the lever interlocking contact, so that the starter circuit or the ignition circuit with a timer circuit is ON and the lever interlocking contact is closed. It is characterized in that the electromagnetic on-off valve is configured to be opened when the vehicle is in use.

The present invention will be explained in detail below based on embodiments shown in the drawings.

In the embodiment shown in FIG. 1, an air introduction passage 3 is constituted by an EGR (exhaust gas recirculation) passage that communicates an exhaust manifold 1 and an intake manifold 2. Therefore, when the electromagnetic on-off valve 4 described later is open, new air is taken into the intake manifold 2 through the exhaust pipe system 5, the exhaust manifold 1, and the EGR passage (air introduction passage) 3 when the engine is started.

An electromagnetic on-off valve 4 is installed at a suitable location in the air introduction passage 3.
are arranged. In this embodiment, the electromagnetic on-off valve 4
It consists of an EGR valve 6 and an electromagnetic drive device 7 attached thereto. The EGR valve 6 guides negative pressure from the EGR port etc. to the negative pressure chamber 6a,
It is configured to perform its original function of controlling EGR gas, and for this reason, the operating rod 6b of the EGR valve 6 and the operating rod 9 of the electromagnetic drive device 7 are connected with some play. The electromagnetic drive device 7 moves its operating rod 9 to the right in FIG. 1 only when energized, and moves the operating rod 6b of the EGR valve 6 to the right.
It is configured to move the valve body 8 of the EGR valve 6 to the open position.

The electromagnetic drive device 7 and, by extension, the electromagnetic on-off valve 4 are electrically connected to a starter circuit 10. Further, a lever interlocking contact 12 interlocking with the heater control lever 11 is provided in the middle of this connection part. This lever interlocking contact 12 includes a movable contact part 12a fixed to the lever 11 and a fixed contact part 12 of a predetermined width arranged on the cool side of the guide part of the lever 11.
b, and is configured to close only when the lever 11 is moved to the cool side.

Therefore, according to this embodiment, when the heater control lever 11 is set to the cool side (COOL) under high temperature conditions such as in summer (when operating the cooler in a cooler vehicle, it is not always set to the cool side). ), when the starter switch 10a of the starter circuit 10 is turned on, the lever interlocking contact 12 is also closed, so the electromagnetic drive device 7
becomes energized and the EGR valve 6 opens. As a result, new air (there is almost no exhaust gas since the engine is started) is introduced into the intake manifold 2 via the EGR passage 3, dilutes the evaporated fuel filling the intake system passage, and is drawn into the combustion chamber 13. This prevents the air-fuel mixture from becoming too rich, and improves startability when restarting at high temperatures. When the engine cranking is finished and the starter switch 10a is turned off, the electromagnetic drive device 7 is de-energized.
The EGR valve 6 is closed and the introduction of air into the intake manifold 2 is stopped. This avoids the introduction of excess new air during normal operating conditions,
The engine can be rotated smoothly.

In cold weather such as winter, or after a long period of driving, the amount of evaporated fuel evaporated from the carburetor is small and the temperature of the air-fuel mixture is low, so if new air is introduced into the intake manifold 2, As a result, starting performance deteriorates. According to this embodiment, in cold weather such as winter, the heater control lever 11
As a result, the electromagnetic drive device 7 is always de-energized, and the EGR valve 6 is also closed at this time, so the EGR passage 3 is closed when the engine is started. It is possible to prevent new air from being introduced into the intake manifold 2 through the intake manifold 2, thereby preventing deterioration of startability in cold weather.

In the above embodiment, as the electromagnetic on-off valve 4,
An EGR valve 6 and an electromagnetic drive device 7 are used, and as shown in Fig. 2, new air is directly introduced from the atmosphere into the air introduction passage (consisting of an intake pipe) 3 using an electromagnetic switching valve. It can be configured to: Also, instead of connecting the starter circuit 10 and the electromagnetic on-off valve 4, an ignition circuit 15 with a timer circuit 14 and the electromagnetic on-off valve 4 are connected,
It is also possible to arrange the lever interlocking contact 12 in the middle (FIG. 2). In this case, the ignition switch 15 of the ignition circuit 15
After a is turned ON, the electromagnetic on-off valve 4 opens for a predetermined period of time (several seconds to tens of seconds) (lever interlocking contact 1
It is assumed that 2 is closed. ), it is necessary to configure the timer circuit 14 so that fresh air is introduced into the intake manifold 2 only when the engine is started. Further, in the above embodiment, the air introduction passage 3 is opened in the intake manifold 2, but the invention is not limited to this, and it may be opened at an appropriate position in the intake passage 17 downstream of the throttle valve 16. Furthermore, the electromagnetic on-off valve 4
The intake passage 17 is equipped with an air amount adjustment function, and the intake passage 17 is adjusted according to the set position of the control lever 11.
It is preferable to configure the system so that the amount of new air introduced into the air can be adjusted (the further the control lever 11 is to the left in FIGS. 1 and 2, the more the amount of new air introduced is increased).

Since the present invention has the above-mentioned configuration, it is possible to improve startability when starting the engine at a high temperature, and it also uses an existing control lever to control the introduction of new air to dilute the air-fuel mixture during a high-temperature start. This can be done by simply adding a lever interlocking contact to the
Compared to the prior art which requires a thermoswitch, the manufacturing cost of the device can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overall view showing an embodiment of the present invention, and FIG. 2 is an overall view showing another embodiment of the invention. 3... Air introduction passage, 4... Solenoid on/off valve, 10
...Starter circuit, 14 ...Timer circuit, 15
...Ignition circuit, 16...Throttle valve, 17...Intake passage.

Claims (1)

[Scope of utility model registration request] An electromagnetic on-off valve is placed at a suitable location in the air introduction passage that opens into the intake passage downstream of the throttle valve, while a lever interlocking contact is provided that is linked to the heater control lever and closes only when this lever is on the cool side, and is connected to the starter circuit or timer. An ignition circuit with a circuit and the electromagnetic on-off valve are connected via the lever interlocking contact, and when the starter circuit or the ignition circuit with a timer circuit is ON and the lever interlocking contact is closed, the electromagnetic on-off valve is opened. 1. A high-temperature start improvement device for an engine, characterized in that the device is configured to improve the temperature.