JP2750030B2 - Control device for mechanical supercharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a mechanical supercharger for compressing intake air of an engine.

[0002]

2. Description of the Related Art Conventionally, in a turbocharged engine or an engine not equipped with a turbocharger, a hydraulic motor is driven by hydraulic oil generated by a hydraulic pump driven by the engine in order to improve the startability or acceleration of the vehicle. In addition, there is known a hydraulic motor configured to drive a supercharger that compresses intake air of an engine. The hydraulic motor is connected to the supercharger via an output shaft, and the output shaft is provided with a clutch for connecting and disconnecting the driving force of the hydraulic motor to the supercharger. When the pressure of the intake air by the supercharger becomes excessive, the clutch is disengaged to prevent over-boost of the intake air, and when the intake air becomes too small, the clutch is connected to compress the intake air.

[0003]

However, in the above-mentioned method of switching the supercharger to the operation or non-operation by disconnection of the clutch, it is difficult to send intake air having an optimum pressure for the fuel injection amount to the engine. However, the vehicle could not be accelerated smoothly, and the fuel efficiency could be reduced.

An object of the present invention is to provide a control device for a mechanical supercharger capable of smoothly accelerating a vehicle and improving fuel efficiency.

[0005]

A configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to an embodiment. The control device of the mechanical supercharger according to the present invention is driven by the engine 11 and tilts the swash plate 14b.
A variable displacement hydraulic pump 14 capable of changing the discharge amount of the oil 15 by changing the degree, a hydraulic motor 19 connected to a discharge port 14d of the pump 14 via a pipe line 18, and an engine 11 driven by the motor 19 The supercharger 21 compresses the intake air of the pump 1 and the pump 1 based on the pressure of the intake air in the intake pipe 11 b compressed by the supercharger 21.
Machine equipped with an actuator 22 for controlling the discharge amount
It is an improvement of the control device of the mechanical supercharger . Its features
One particular configuration is that the actuator 22
Diaphragm dividing the inside of the filter 22 into two chambers 22b and 22c.
22a, and one of the two chambers 22b and 22c 2
2b communicates with the intake pipe 11b, and the two chambers 22b and 22c
One end of the rod 22d is inserted into the other chamber 22c.
And one end of the rod 22d is connected to the diaphragm 22a.
And the other end is connected to the swash plate 14b.

[0006]

When the vehicle accelerates, the engine 11 drives the supercharger 21 via the variable displacement hydraulic pump 14 and the hydraulic motor 19. When the intake pressure of the engine 11 is higher than a predetermined value , the die in the actuator 22
The diaphragm 22a connects the rod 22d to the actuator 22
The swash plate 14b is moved in the direction in which
Rotate in the direction of the mark, and the actuator 22
Pump 14 so as to reduce the discharge amount of oil 15 from
Control. If the pressure of the intake air of the engine 11 is smaller than a predetermined value, the diaphragm 22a returns to
Move the rod 22d in the direction of pulling it into the actuator 22.
To rotate the swash plate 14b in the direction of the dashed arrow in FIG.
Accordingly , the pump 14 is controlled so that the actuator 22 increases the discharge amount of the oil 15 from the pump 14.

[0007]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, an input shaft 14a of a variable displacement hydraulic pump 14 is connected to a crankshaft 11a of an engine 11 of a vehicle via gears 12 and 13. In this example, the pump 14 is provided inside a case 14e. This is a swash plate pump capable of changing the discharge amount of the oil 15 by changing the inclination angle of the swash plate 14b pivotally supported by the pump. Inlet 14 of pump 14
“c” is connected to an oil tank 16 via a suction pipe 17, and a hydraulic motor 19 is connected to a discharge port 14 d via a pipe 18. The motor 19 is connected to a supercharger 2 provided on an intake pipe 11b of the engine 11 via an output shaft 19a.
Connected to 1. Branch pipe 11d branched from intake pipe 11b between supercharger 21 and intake manifold 11c
Is connected to an actuator 22 described later. A relief pipe 32 branching off from the pipe 18 between the pump 14 and the motor 19 is connected to the oil tank 16 via a safety valve 33 (FIG. 1).

The variable displacement hydraulic pump 14 is shown in FIGS.
As shown in detail in FIG.
g, the input shaft 14a rotatably inserted through the g, and the swash plate 1 loosely fitted to the input shaft 14a and pivotally supported in the case 14e.
4b and the input shaft 14 rotatably housed in the case 14e.
a cylinder block 14h that is fitted spline to a,
A plurality of pistons 14j slidably inserted into a plurality of cylinder holes 14i formed in the cylinder block 14h at equal intervals on the same circumference around the input shaft 14a.
The case 14e has a case body 14k having an opening on one end face and a cover 14m for sealing the opening,
The cover 14m is formed with a suction port 14c for guiding the oil 15 to the cylinder hole 14i and a discharge port 14d for discharging the oil 15 from the cylinder hole 14i. A gear 13 is fixed to the tip of the input shaft 14a projecting from the case 14e.
Meshes with a gear 12 fixed to the crankshaft 11a.
One end of a piston 14j projecting from the cylinder hole 14i toward one surface of the swash plate 14b has a spherical held portion 14n.
Is formed, and a plurality of shoes 14r slidable on one surface of the swash plate 14b are pressed against the surface by a pressing plate 14s. The shoe 14r holds the held portion 14n of the piston 14j rotatably and deflectably by a concave portion formed in a spherical shape.

The inclination angle of the swash plate 14b is
The actuator 22 has a built-in diaphragm 22a that partitions the interior of the actuator 22 into two chambers 22b and 22c. One chamber 22b is a branch pipe 11d.
And one end of a rod 22d is inserted into the other chamber 22c. One end of the rod 22d is fixed to the diaphragm 22a, and the other end is connected to the upper end of the swash plate 14b. A compression coil spring 22e having a predetermined elastic force is provided in the other chamber 22c of the actuator 22.
The spring 22e urges the rod 22d to be pulled into the actuator 22 (FIG. 1). When the pressure in one chamber 22b of the actuator 22 increases, the rod 22d moves against the swash plate 14b against the elastic force of the spring 22e.
When the pressure in one chamber 22b decreases, the rod 22d rotates the swash plate 14b in the direction indicated by the dashed arrow in FIG. 3 by the elastic force of the spring 22e. As the swash plate 14b rotates from the position shown in FIG. 3 to the position shown in FIG. 2, the distance that the piston 14j reciprocates in the cylinder hole 14i increases, and the amount of oil sucked from the inlet 14c and the amount of oil discharged from the outlet 14d increase. The amount of oil to be discharged is configured to be large.

The operation of the control device for a mechanical supercharger configured as described above will be described. When the vehicle is accelerated, the engine 11 drives the variable displacement hydraulic pump 14, the pump 14 supplies oil 15 to the hydraulic motor 19 to drive the motor 19, and the motor 19 drives the supercharger 21. When the pressure in the intake pipe 11b of the engine 11 is larger than a predetermined value, the diaphragm 22a in the actuator 22 moves the rod 22d in a direction protruding from the actuator 22 against the elastic force of the compression coil spring 22e, and the swash plate 14b Is rotated in the direction of the solid arrow in FIG. As a result, the discharge amount of the oil 15 from the pump 14 is reduced.
The supercharging pressure in b becomes smaller. When the pressure in the intake pipe 11b of the engine 11 is smaller than a predetermined value, the diaphragm 22a in the actuator 22 moves the rod 22d in the direction of drawing the rod 22d into the actuator 22 by the elastic force of the compression coil spring 22e, and moves the swash plate 14b in FIG. In the direction of the dashed arrow. As a result, the discharge amount of the oil 15 from the pump 14 increases, so that the supercharging pressure in the intake pipe 11b by the supercharger 21 increases. As a result, the intake of the optimal pressure is supplied to the engine 11, so that the vehicle is accelerated smoothly. Further, since the efficiency of the engine 11 during acceleration is improved, fuel efficiency is improved.

In the embodiment, a swash plate pump in which the angle of a swash plate can be changed by an actuator has been described as a variable displacement hydraulic pump. However, the present invention is not limited to this, and other pumps can be used if the discharge amount can be changed. Is also good. Further , the device according to the present invention may be mounted on an engine equipped with a turbocharger that compresses intake air using the energy of exhaust gas.

[0012]

As described above, according to the present invention, according to the present invention, A
The actuator divides this actuator into two chambers
It has a diaphragm and sucks one of these two chambers.
Into the trachea, insert one end of the rod into the other chamber,
Connect one end of the rod to the diaphragm and the other end to the swash plate
Since the connection, the amount of oil discharged by the pump is
And mechanically controlled by the actuator based on this . This
As a result, the vehicle is accelerated smoothly because the intake air having the optimum pressure is supplied to the engine. Further, since the efficiency of the engine during acceleration is improved, fuel efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a control device for a mechanical supercharger according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a variable displacement hydraulic pump of the device discharges oil from a discharge port to a hydraulic motor or a hydraulic device.

FIG. 3 shows a state in which the hydraulic pump does not discharge oil from its discharge port to any of a hydraulic motor and a hydraulic device.
Sectional drawing corresponding to FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Engine 14 Variable displacement hydraulic pump 14d Discharge port 15 Oil 18 Pipeline 19 Hydraulic motor 21 Supercharger 22 Actuator 22a Diaphragm 22b, 22c Chamber 22d rod

Claims (1)

(57) [Claims] 1. A swash plate (14b) driven by an engine (11 ).
A variable displacement hydraulic pump (14) capable of changing the discharge amount of the oil (15) by changing the inclination angle of the pump (14), and connected to a discharge port (14d) of the pump (14) via a pipeline (18). A hydraulic motor (19), a supercharger (21) driven by the motor (19) to compress the intake air of the engine (11), and an intake pipe (11 ) compressed by the supercharger (21).
The control device of the mechanical supercharger with an actuator (22) for controlling the discharge rate of the pump (14) on the basis of the pressure of the intake air in b), the actuator (22) said actuator (22) To
It has a diaphragm (22a) for dividing into two chambers (22b, 22c), and one of the two chambers (22b, 22c) is the intake pipe
(11b), and the rod (22) is connected to the other chamber (22c) of the two chambers (22b, 22c).
One end of d) is inserted and one end of the rod (22d) is connected to the diaphragm (22a)
Is and wherein the other end of which is connected to the swash plate (14b)
Control device of the mechanical supercharger.