JPH02227556A - Bypassing air control device for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable bypassing air to be properly controlled at all times by providing a sensor detecting environmental temperature in addition to a cooling water sensor, and thereby opening/closing a control valve based on detected signals from the respective sensors. CONSTITUTION:A control valve 24 is provided for a bypass passage 22 going around an air intake throttle valve 8 in the air intake passage 6 of an engine 10, and is controlled by a control section 20 based on detected signals from a cooling water sensor 16. With this arrangement, an outside temperature sensor 18 detecting the environmental temperature of the engine 10, for example, outside temperature, is provided. Then, the control section 20 thereby controls the control valve 24 based on not only the detected signal from the cooling water sensor 16 but also the detected signal from the outside temperature sensor 18. By this constitution, the quantity of bypassing air is properly controlled at all times, and proper engine revolutions can thereby be secured at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a bypass air control device for an internal combustion engine, and in particular to a control valve provided in a bypass passage that bypasses an intake throttle valve in an intake passage of an engine. The present invention relates to a bypass air control device for an internal combustion engine that opens and closes in response to a detection signal from a bypass passage to control the amount of bypass air passing through a bypass passage.

[Prior Art] As a bypass air control device for an internal combustion engine, a control valve provided in a bypass passage that bypasses an intake throttle valve is electrically controlled to open and close based on a detection signal from a cooling water sensor. There are devices that control the amount of air taken into the engine by adjusting the amount of air.

As the bypass air control device for the internal combustion engine, there is one disclosed in Japanese Patent Application Laid-Open No. 60-201041. The idle rotation speed control device disclosed in this publication uses control from a second control amount generation means that operates only in accordance with the cooling water temperature after startup instead of the first control amount generation means during a predetermined operating state. The engine speed is used to adjust the idle intake air flow rate to prevent the engine speed from dropping or fluctuating during startup and from stalling the engine, as well as preventing the idle speed from increasing abnormally at room temperature.

[Problems to be Solved by the Invention] By the way, in the conventional bypass air control device for an internal combustion engine, in order to maintain good warm-up performance at low temperature startup, the bypass air control device operates according to the coolant temperature T ("C)", which is the cooling water temperature. Controls the amount of air.

In other words, as is clear from Fig. 3(a), the engine speed Ne (rpm) is increased at low temperatures, and as is clear from Fig. 3(b), the bypass air ff1 is increased at low temperatures.
Q(, g/m1n) is set to be large.

However, the bypass air ff1Q(, ///m1n)
is set to meet the conditions in extremely cold regions where the amount of water required is generally large.

For this reason, when the outside temperature is relatively low, for example, when starting or warming up at a low temperature that is not extremely cold, the engine speed tends to be higher than necessary, resulting in increased vibration and noise. Additionally, when the engine starts running immediately after starting, the idle speed decreases slowly, resulting in poor drivability, which is disadvantageous in practical terms.

[Object of the Invention] Therefore, an object of the present invention is to provide a bypass air control device for an internal combustion engine with an ambient temperature sensor for detecting the ambient temperature of the internal combustion engine, and to provide an ambient temperature sensor and a cooling water sensor in order to eliminate the above-mentioned disadvantages. By installing a control unit that inputs the detection signal from the engine and opens and closes the control valve to control the amount of bypass air, it is possible to supply the amount of bypass air according to the ambient temperature and cooling water temperature, and maintain the appropriate engine speed. The object of the present invention is to realize a bypass air control device for an internal combustion engine that can improve drivability compared to the conventional one.

[Means for solving the problem] In order to achieve this object, the present invention opens and closes a control valve provided in a bypass passage that bypasses an intake throttle valve in an intake passage of an engine in response to a detection signal from a cooling water sensor. A bypass air control device for an internal combustion engine that controls the amount of bypass air passing through the bypass passage includes an ambient temperature sensor that detects an ambient temperature of the internal combustion engine, and a detection signal from the ambient temperature sensor and the cooling water sensor. The present invention is characterized in that a control section is provided which controls the bypass air m by inputting input and opening and closing the control valve.

[Operations] With the configuration described above, when the internal combustion engine is started at a low temperature by the bypass air control device, the detection signals from the ambient temperature sensor and the cooling water sensor are input to the control section, and the control valve is opened and closed to control the amount of bypass air. The system controls the amount of bypass air according to the ambient temperature and cooling water temperature, maintains an appropriate engine speed, and improves drivability compared to conventional systems.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 1.2 shows an embodiment of the invention. 1st
In the figure, 2 is an air cleaner, 4 is an intake manifold,
6 is an intake passage, 8 is a throttle valve, 10 is an internal combustion engine, 12 is an exhaust manifold, and 14 is an exhaust passage.

A cooling water sensor 16 is provided to detect the temperature of the cooling water of the engine 10, and an outside air temperature sensor 18 is provided to detect the atmosphere of the engine 10, for example, outside air temperature. These cooling water sensor 16 and outside temperature sensor 18 are connected to a control section (CP
U) Contacting 20.

The control unit 20 includes an intake passage 6 upstream of the throttle valve 8.
A solenoid type bypass air amount control valve 24, which is a control valve, is interposed in the bypass passage 22, which has one end 22a open and the other end 22b open to the intake passage 6 downstream of the throttle valve 8.

Further, the control unit 20 has a configuration that inputs detection signals from the outside temperature sensor 18 and the cooling water sensor 16, and opens and closes the solenoid type bypass air amount control valve 24 to control the amount of bypass air. .

To be more specific, the control unit 20 divides the outside air temperature into, for example, four stages T al '' T a4, and as shown in FIG. The bypass air amount Q()/m1n) is determined, and the bypass air amount control valve 24 is opened and closed to control the bypass passage 22.
This is to control bypass air ff1Q (l/m1n) passing through.

Next, the effect will be explained.

When the engine 10 is started at a low temperature, the cooling water sensor 16
The respective detection signals from the outside temperature sensor 18 are input to the control unit 20, and the control unit 20 determines T a according to the outside air temperature.
- of the setting curve divided into four stages up to l # T ad
Determine.

Then, the bypass air ff1Q()/m1n is determined based on the determined setting curve and the cooling water sensor 16.
), the opening/closing operation of the bypass air amount control valve 24 is controlled by the control section 20, and the controlled amount passing through the bypass passage 22 is set to the above-mentioned bypass air amount Q()/m i
n).

As a result, the cooling water sensor 16 and the outside temperature sensor 18
Bypass air amount Q (/e/
This proper bypass air mQ ()/m1n) can be supplied to the engine 10 to ensure a proper engine speed, improving drivability and fuel efficiency compared to the past. At the same time, it is possible to reduce vibration and noise.

Further, since the bypass air ff1Q (I//min) can be properly controlled by the control unit 20 which inputs the detection signals of the cooling water sensor 16 and the outside temperature sensor 18, the harmful υ1: It is also possible to reduce gas, which is advantageous in practice.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made.

For example, in the embodiment of the present invention, an outside temperature sensor that detects the outside air temperature is used as the ambient temperature sensor that detects the ambient temperature of the engine, but the intake air temperature sensor that detects the intake air temperature supplied to the engine is used as the ambient temperature sensor that detects the ambient temperature of the engine. It can also be used in place of an ambient temperature sensor.

[Effects of the Invention] As described in detail above, according to the present invention, the bypass air control device for an internal combustion engine is provided with an ambient temperature sensor for detecting the ambient temperature of the internal combustion engine, and the detection from the ambient temperature sensor and the cooling water sensor is We installed a control section that inputs signals and opens and closes the control valve to control the amount of bypass air.
The amount of bypass air can be controlled according to the respective detection signals of the cooling water sensor and the outside temperature sensor, and the appropriate amount of bypass air can be supplied to obtain an appropriate engine rotation speed.
It is possible to improve drivability and fuel efficiency compared to the conventional technology, and also to reduce vibration and noise. Furthermore, since the amount of bypass air can be appropriately controlled by the control section, harmful exhaust gases can also be reduced, which is advantageous in practice.

[Brief explanation of the drawing]

Fig. 1.2 shows an embodiment of the present invention, Fig. 1 is a schematic diagram of a bypass air control device for an internal combustion engine, and Fig. 2 shows a setting curve that divides the outside air temperature into four stages from Ta+ to Tan, and a bypass air control device. Quantity Q (, g/m1n) and water i'1lTW ('C
) is a diagram showing the relationship between FIGS. 3(a) and 3(b) show the prior art of this invention;
Figure (a) shows the water temperature Tw ("C) and the engine speed Ne (r
Figure 3 (b) is a diagram showing the relationship between water temperature Tw(”
C) and the bypass air amount Q (7/min). In the figure, 2 is the air cleaner, 4 is the intake → Nifold,
6 is an intake passage, 8 is a throttle valve, 10 is an engine, 12 is an exhaust manifold, 14 is an exhaust passage, 16 is a cooling water sensor,
18 is an outside temperature sensor, 20 is a control section, 22 is a bypass passage, and 24 is a solenoid type bypass air amount control valve. Patent Applicant Suzuki Motor Co., Ltd. Representative Patent Attorney Yoshi Nishigo Figure 1 Figure 2 Low temperature Tw ('C) High temperature Figure 3 Water temperature (0C)

Claims (1)

[Claims] 1. A bypass air control device for an internal combustion engine that controls the amount of bypass air passing through the bypass passage by opening and closing a control valve provided in a bypass passage that bypasses an intake throttle valve in the intake passage of the engine based on a detection signal from a cooling water sensor. An ambient temperature sensor is provided for detecting the ambient temperature of the internal combustion engine, and a control section is provided for inputting detection signals from the ambient temperature sensor and the cooling water sensor to open and close the control valve to control the amount of bypass air. A bypass air control device for an internal combustion engine, characterized by: