JPH01121512A - Supercharger of engine - Google Patents

Abstract

PURPOSE:To suppress power consumption and eliminate turbo lag by putting a motor driven supercharge pump in operation in such conditions as under acceleration, in middle gear position or above, and with low supercharge pressure. CONSTITUTION:In such conditions as under acceleration, in middle gear position or above of transmission 33, and with low supercharge pressure of turbo charger 2, a motor driven pump 5A is put in operation to cause greater effect of a supercharging of engine, which 3 thus rotates with quick rising. When the engine 3 revolutions become high, the supercharge pump 5A will stop, and turbo supercharge by the turbo charger 2 start. Even though the supercharge pump 5A stops, there is no risk for the turbo supercharge pressure by the turbo charger 2 to leak to the supercharge pump side owing to No.1 check valve 6B. While supercharge is made by the motor driven supercharge pump 5A, there is no risk of leak of supercharge pressure to the turbo charger side owing to No.2 check valve 6A.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an engine supercharging device for driving an electric supercharging pump by an electric motor in a vehicle using a turbocharged engine.

"Prior Art and its Problems" Previously, Japanese Patent Application Laid-Open No. 57-108412 discloses that in order to eliminate turbo lag in a turbocharged engine, a turbo pump is operated by an electric motor linked to an accelerator switch when the engine accelerates. A supercharging device that rapidly obtains intake pressure is disclosed, but this supercharging device has an electric motor and a generator, or a motor generator installed on a shaft that connects an exhaust turbine and a turbo pump in a turbocharger. The turbo pump is operated by the electric motor only during sudden acceleration exceeding the level of , and then the exhaust turbine operates the generator linked to the exhaust turbine. Since the engine rotates the generator, the engine cannot be sufficiently supercharged.Also, the rotation speed of the electric motor must be at a level of around rpm, and the electric motor that can achieve this is also expensive. . Furthermore, in conventional supercharging devices, the turbocharger is operated by an electric motor that is energized when the accelerator switch is turned on whenever the accelerator pedal is rapidly depressed, regardless of the gear position of the transmission in the engine. Therefore, when the gear position of the manual transmission is 1 or 2 far, the engine output is relatively larger than the force required to accelerate the car, so even when the effect of supercharging is small, a large amount of power is supplied to the electric motor. , battery power consumption is high,
This had the disadvantage of causing the battery to run out.

"Problems to be Solved by the Invention" The present invention has been made in view of the above problems.
To provide an engine supercharging device that consumes little power, can eliminate turbo lag, can supercharge even when a vehicle is running at high speed, and does not adversely affect a battery.

Means for Solving rtjAM" The configuration of the present invention in accordance with the above object includes a turbocharger consisting of a plurality of electric supercharging pumps, an exhaust turbine and a turbo pump, and a pipe line from the electric supercharging pump to the engine. a first check valve provided in the engine, a second check valve provided in a conduit leading from the turbo pump to the engine, a means for detecting a throttle relation in the engine, and a means for detecting a gear position of a transmission in the engine. means for detecting, means for detecting supercharging pressure by a turbocharger, mode selection means for selecting one from a plurality of modes; selectively operating each of the plurality of electric supercharging pumps according to the mode selected by the mode selection means when the position is at a middle speed gear position or higher and the supercharging pressure by the turbocharger is low; The invention is characterized by comprising an actuating means for causing.

"Function" According to the configuration of the present invention, the turbocharger is activated when the manual transmission vehicle is at a middle speed gear position such as 3rd or 4th gear or higher, and when the automatic transmission vehicle is at a middle speed gear position equivalent to 3rd gear or higher. Since the electric supercharging pump is activated when the boost pressure is low and the accelerator pedal is pressed heavily, the effect of engine supercharging becomes greater, and the electric supercharging pump is not activated too frequently. This reduces battery power consumption. Then, when supercharging starts, the engine starts to rotate quickly even if the engine speed is low because the supercharging pressure is high. When the engine reaches high rpm, the electric supercharging pump stops and turbocharging starts using the turbocharger. Even if the T4 dynamic supercharging pump stops, the first check valve prevents turbocharging pressure from the turbo pump from leaking to the electric supercharging pump.
In addition, when supercharging is performed using the electric supercharging pump, the second check valve prevents supercharging pressure from leaking to the turbo pump side.In this way, even if the accelerator pedal is depressed, the turbocharger Since the electric supercharging pump operates only when it is not operating sufficiently and when the acceleration effect is high, power consumption is kept to the minimum necessary and the battery is prevented from dying.

Furthermore, each of the plurality of electric supercharging pumps is selectively driven according to the mode selected by the mode selection means. Therefore, for example, two types of modes, power mode and economy mode, can be set in advance, and in power mode all electric supercharging pumps are driven, while in economy mode only some electric supercharging pumps are driven. By doing so, it becomes possible to exhibit high acceleration performance as required or to save fuel consumption. In addition, by using a plurality of electric supercharging pumps, each electric supercharging pump can be made smaller and the inertia force can be reduced, so that responsiveness can be improved.

"Embodiment" Next, the configuration of an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the air that has passed through the air cleaner 1 passes through the turbo pump 21 in the turbocharger 2 and is sucked into the intake pipe 4 fixed to the intake manifold 31 of the engine 3. On the other hand, when the electric supercharging pumps 5A, 5B are operating, the air that has passed through the air cleaner 1 is transferred to the electric supercharging pumps 5A, 5B.
The intake manifold 31 of the engine 3 is supercharged via the intake pipe 4. An intake pipe 4 from the turbo pump 21 to the intake manifold 31, and an electric supercharging pump 5A,
The intake pipe 4 extending from the intake manifold 31 from the intake manifold 5B is provided with check valves 6A, 6)3, respectively. In the intake pipe 4, an intercooler 8 for cooling intake air is provided in front of the throttle valve 7. Turbo pump 21 in turbocharger 2
is connected to the exhaust turbine 22 by a rotating shaft 23. The exhaust turbine 22 is provided in the middle of the exhaust pipe 9 that extends from the exhaust manifold 32 of the engine 3 to the atmosphere. A muffler 10 is connected to the end of the exhaust pipe 9. Although not particularly limited, the electric supercharging pumps 5A and 5B are equipped with two DC electric motors allA and IIB as drive sources, and the rotation of these DC motors 11A and 11B is controlled by an electronically controlled bag Wt12.
It is now controlled by. This electronic control device 12 includes a microcomputer 1 as shown in FIG.
It is composed of 2A. A throttle sensor 13 is connected to the input side of the microcomputer 12A.
Throttle opening signal θ according to the opening of throttle valve 7? A will be introduced. In addition, the microcomputer 12
On the input side of A, there is an engine rotation speed signal Ne proportional to the rotation speed of the engine 3 from the rotation sensor 34, and an engine rotation speed signal Ne proportional to the rotation speed of the engine 3 from the rotation sensor 34.
A vehicle speed signal V proportional to the output rotation speed of the manual transmission 33 from 5 and an output signal of the mode selection switch 16 are introduced.

This mode selection switch is configured to allow two-stage switching between power mode and economy mode.

A drive circuit 12 is provided on the output side of the microcomputer 12A.
DC motor 11A via B, 12B'.

11B is connected.

"Operation" The operation of this embodiment with the above configuration will be explained using the flowchart of the microcomputer 12A shown in 3rd rM.

When the flow shown in Figure 3 starts, step 1
In step 01, initial settings are performed, and in step 102, data on the engine rotational speed Ne is taken in. Step 1
In step 03, it is determined whether or not the engine rotation speed Ne is equal to or less than the set rotation speed (=x), and when a positive determination result is obtained, the roadway data V is fetched in step 104.

In step 105, it is determined whether the product of the vehicle speed V and the gear ratio α is greater than the engine rotation speed Ne, and when a positive determination result is obtained, in step 106, the throttle opening data θ7. is taken in. In step 107,
Throttle opening θ! It is determined whether - is greater than or equal to a predetermined value,
When a positive determination result is obtained, the data of the mode selection switch is fetched in step 108. Next, in step 109, it is determined whether the mode selection switch 16 is switched to the power mode or the economy mode. If the mode selection switch 16 is set to the power mode, in step 110, the +1 current motor 11A and the DC motor 11B are switched. Both are turned on. On the other hand, if the mode selection switch 16 is set to economy mode, only the DC motor 11A is turned on in step 111.
Return to step 102.

Note that step 103. Step 105. Or, when a negative judgment result is obtained in step 107, in step 112, the DC motor 11A and the DC motor 1
1B is turned off and the process returns to step 102.

Since the engine rotation speed Ne is proportional to the supercharging pressure by the turbocharger 2, it is determined in step 103 whether the engine rotation speed Ne is below the set rotation speed (X), thereby determining whether the supercharging pressure is below the predetermined value. will be judged.

An example of the relationship between the engine rotation 11i1'Je and the vehicle speed V is shown in FIG.
3 gear positions are 1st, 2nd, 3rd, and 4th.

As the gear is shifted to 5th gear, the vehicle speed (2) increases even if the engine speed Ne is the same. Therefore, in step 105, by comparing and determining the magnitude of the vehicle speed V, the gear ratio α Wtvα, and the engine rotation speed Ne, the transmission system is determined. [It is determined whether the gear position of f33 is at or above a medium speed position such as 2nd or 3rd speed.

Through the series of control steps described above, the transmission W! 33
is at or above the middle speed gear position, the supercharging pressure from the turbocharger 2 is low, and the accelerator pedal is depressed significantly so that the throttle opening is above a predetermined value, the DC motor 11
A and IIB are turned on, the tgJ supercharging pumps 5A and 5B are activated rapidly, and the engine 3 is supercharged via the check valve 6B and the intercooler 8. Then, when supercharging starts, the engine 3 starts rotating quickly because the supercharging pressure is high even if the rotation speed is low. When the rotation speed of the engine 3 increases, the electric supercharging pumps 5A and 5B stop.
Turbocharging by the turbocharger 2 is started. Check valve 6B is closed at 8 o'clock at the same time as turbocharging starts.
On the other hand, since the check valve 6A is opened at this time, the turbocharging pressure does not leak to the electric supercharging pumps 5A and 5B. Furthermore, when the electric supercharging pumps 5A and 5B are supercharging, the check valve 6B is open and the check valve 6A is closed, so supercharging pressure does not leak to the turbo pump 2 side.

During supercharging by the electric supercharging pumps 5A and 5B, if the mode selection switch 16 is set to power mode, both the electric supercharging pump 5A and the electric supercharging pump 5B are driven,
Since the engine is supercharged at high pressure, the engine speed increases rapidly. Furthermore, when the mode selection switch 16 is set to the economy mode, only the electric supercharging bomber 5A is driven, so the supercharging pressure becomes relatively low and fuel consumption can be reduced.

"Other Embodiments" The present invention is not limited to the details of the above embodiments. For example, the electronic control device 12 in this embodiment may be configured with a logic circuit instead of the microcomputer 12A. Furthermore, although this embodiment uses an automatic check valve, it may also be controlled using an externally switched valve (for example, a diaphragm-switched valve). Furthermore, the gear ratio may vary depending on the vehicle model. Considering the engine characteristics, the vehicle can normally be efficiently accelerated in the second to third gears, so the mission position can be determined as either the second gear or higher or the third gear or higher. In other words, if the car is in 1st gear, even if the boost pressure is increased, the speed of the car will not increase that much5.
Also, even if the electric supercharging pump is activated in 4th or 5th gear, the vehicle speed is already high and the engine is already at a certain number of revolutions, so the turbocharger is also operating, so the need for an electric supercharging pump is reduced. That's because there isn't. Incidentally, since an automatic transmission vehicle also has a transmission gear, a similar configuration can be made by detecting the position of a middle speed gear corresponding to second or third speed.

Furthermore, in this embodiment, the vehicle speed ■ and the gear ratio α are compared with the engine rotational speed Ne to detect that the transmission 33 is in the intermediate gear position.
6 (see FIG. 1) may be provided, and this switch 36 may be used to detect which speed the transmission is in.

In addition, in this embodiment, the supercharging pressure of the turbocharger 2 is determined from the engine speed Ne, but a pressure sensor 14 (see Fig. 1) is provided on the outlet side of the turbo pump 21 of the turbocharger 2 to directly turbocharge the turbocharger. The supercharging pressure of the charger 2 may also be detected.

"Effects" - As described above, the engine supercharging device of the present invention includes a plurality of electric supercharging pumps and a turbocharger, and is in an acceleration state with a wide throttle opening and a gear position in the middle. Since the electric supercharging pump is operated when the position is higher than the highest gear position and the supercharging pressure from the turbocharger is low, power consumption is low and turbo lag can be eliminated, and it can be used in a short time. It has the excellent effect of being able to efficiently accelerate the vehicle, and also supercharging the engine even when the vehicle is running at high speed. According to the present invention, each of the plurality of electric supercharging pumps can be selectively driven according to the mode selected by the mode selection means.

Therefore, for example, two types of modes, power mode and economy mode, can be set in advance, and in power mode all electric supercharging pumps are driven, while in economy mode only some electric supercharging pumps are driven. By doing so, it becomes possible to exhibit high acceleration performance as required or to save fuel consumption. In addition, by using a plurality of electric supercharging pumps, each electric supercharging pump can be made smaller and the inertia force can be reduced, so that responsiveness can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing the structure of an electronic control device in this embodiment, FIG. 3 is a flowchart of a microcomputer constituting the electronic control device, and FIG. The figure is a characteristic diagram showing the relationship between vehicle speed and engine speed. 101. Air cleaner, 211. turbocharger,
21., Turbo pump, 22., Exhaust turbine, 303. Engine, 31, Intake manifold, 32, Exhaust manifold, 33. ,,Transmission, 34.35. , , rotation sensor 36 , , switch 411 . Intake pipe, 5A, 5B,...T4B
Supercharging pump, 6A, 6B0. , check valve, I
IA, 11B...DC motor, 12. ,,Electronic control unit, 12A,,,Microcomputer, 13
, , Throttle sensor 14 , , Pressure sensor 16. ,,mode selection switch. 2121 Strategy 3 Figure 4 Army Speed V

Claims (5)

[Claims] (1) A turbocharger consisting of a plurality of electric supercharging pumps, an exhaust turbine and a turbo pump, a first check valve provided in a conduit leading from the electric supercharging pump to the engine, and a first check valve from the turbo pump to the engine. a second check valve provided in a conduit leading to the engine, a means for detecting a throttle opening in the engine, a means for detecting a gear position of a transmission in the engine, and a means for detecting supercharging pressure in a turbocharger. mode selection means for selecting one from a plurality of modes; and the throttle opening is in a state where it is opened to a value greater than a set value, the gear position is a medium speed gear position or higher, and the overload is caused by a turbocharger. An engine supercharging device comprising an operating means for selectively operating each of the plurality of electric supercharging pumps according to the mode selected by the mode selection means when the boost pressure is low. . (2) The engine supercharging device according to claim 1, wherein the gear position is determined from a relational expression among vehicle speed, gear ratio, and engine rotation speed. (3) The engine supercharging system according to claim 1, wherein the gear position is directly detected from a switch indicating the gear position. (4) The engine supercharging device according to claim 1, wherein the supercharging pressure by the turbocharger is determined from an engine rotational speed that is proportional to the supercharging pressure. (5) The engine supercharging device according to claim 1, wherein the supercharging pressure by the turbocharger is determined by a pressure sensor.