JPH0586883A - Control device for mechanical supercharger - Google Patents

Abstract

PURPOSE:To smoothly accelerate a vehicle and to improve fuel consumption. CONSTITUTION:A variable capacity type hydraulic pump 14 free to change discharge of oil 15 is driven by an engine 11, and a hydraulic motor 19 is connected to a discharge port 14d of the pump 14 through a line 18. Additionally, a supercharger 21 to compress suction air of the engine 11 is driven by the motor 19. When pressure of the suction air compressed by the supercharger 21 is larger than a specified value, the pump 14 is controlled by an actuator 22 to reduce discharge of the pump 14, and when the pressure of the suction air is smaller than the specified value, the pump 14 is controlled by the actuator 22 to increase the discharge of the pump 14.

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

[0003]

However, in the method of switching the supercharger into the operating state or the non-operating state by connecting and disconnecting the clutch, it is difficult to send the intake air having the optimum pressure for the fuel injection amount to the engine to the engine. , There was a risk that the vehicle could not be accelerated smoothly and the fuel efficiency would deteriorate.

An object of the present invention is to provide a control device for a mechanical supercharger which can accelerate a vehicle smoothly and improve fuel consumption.

[0005]

A configuration of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The control device of the mechanical supercharger of the present invention is
A variable displacement hydraulic pump 14 driven by the engine 11 and capable of changing the discharge amount of the oil 15, and a discharge port 1 of the pump 14.
A hydraulic motor 19 connected to 4d through a pipe line 18,
It is provided with a supercharger 21 driven by a motor 19 to compress the intake air of the engine 11, and an actuator 22 for controlling the discharge amount of the pump 14 based on the pressure of the intake air compressed by the supercharger 21.

[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 pump 22 controls the actuator 22 to reduce the discharge amount of the oil 15 from the pump 14.
Control 4 When the pressure of the intake air of the engine 11 is smaller than a predetermined value, the actuator 22 controls the pump 14 so as to increase the discharge amount of the oil 15 from the pump 14.

[0007]

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 through gears 12 and 13, and the pump 14 is a case 14e in this example. 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. Intake port 14 of pump 14
c is connected to the oil tank 16 via a suction conduit 17, and the discharge port 14d is connected to a hydraulic motor 19 via a conduit 18. The motor 19 is a supercharger 2 provided on an intake pipe 11b of the engine 11 via an output shaft 19a.
Connected to 1. A branch pipe 11d that branches from the intake pipe 11b between the supercharger 21 and the intake manifold 11c.
Is connected to an actuator 22 described later. A relief pipe 32 branching 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.
An input shaft 14a rotatably inserted through g, and a swash plate 1 loosely fitted to the input shaft 14a and pivotally supported in a case 14e.
4b and the input shaft 14 rotatably housed in the case 14e.
Cylinder block 14 splined in a
h and a plurality of cylinder holes 14 formed in the cylinder block 14h at equal intervals on the same circumference around the input shaft 14a.
and a plurality of pistons 14j slidably inserted into i. The case 14e has a case main body 14k having an opening on one end surface and a cover 14m for sealing the opening. The cover 14m has a suction port 14c for guiding the oil 15 to the cylinder hole 14i and an oil from the cylinder hole 14i. A discharge port 14d for discharging 15 is formed. A gear 13 is fixed to the tip of the input shaft 14a protruding from the case 14e, and the gear 13 meshes with the gear 12 fixed to the crankshaft 11a. A spherical retained portion 14n is formed at one end of a piston 14j projecting from the cylinder hole 14i toward one surface of the swash plate 14b, and one surface of the swash plate 14b is slidable on the one surface. The shoe 14r is pressed against the pressing plate 14s. The shoe 14r is configured so as to rotatably and rotatably hold the held portion 14n of the piston 14j by means of a concave portion formed in a spherical shape.

The inclination angle of the swash plate 14b is the actuator 2
2, the actuator 22 has a built-in diaphragm 22a that divides the interior of the actuator 22 into two chambers 22b and 22c. One chamber 22b is a branch pipe 11d
Is connected to the intake pipe 11b via one end, 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.
Is built in, and this spring 22e urges the rod 22d to be drawn into the actuator 22 (FIG. 1). When the pressure in one chamber 22b of the actuator 22 increases, the rod 22d resists the elastic force of the spring 22e and the swash plate 14b.
2 in the direction of the solid line arrow in FIG. 2, and when the pressure in one chamber 22b becomes smaller, the rod 22d rotates the swash plate 14b in the direction of the broken line 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 by which the piston 14j reciprocates in the cylinder hole 14i increases, and the amount of oil sucked from the suction port 14c and the discharge port 14d are increased. It is configured to increase the amount of oil discharged.

The operation of the control device for the mechanical supercharger thus configured will be described. When accelerating the vehicle, 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 also 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 projecting 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 decreases, so that the intake pipe 11 by the supercharger 21
The supercharging pressure in b becomes small. 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 pulling the rod 22d into the actuator 22 by the elastic force of the compression coil spring 22e, and the swash plate 14b shown in FIG. Rotate in the direction of the dashed arrow. As a result, the amount of oil 15 discharged from the pump 14 increases, and the supercharging pressure in the intake pipe 11b by the supercharger 21 increases. As a result, the intake air of the optimum pressure is supplied to the engine 11, so that the vehicle is smoothly accelerated. Further, the efficiency of the engine 11 at the time of acceleration is improved, so that the fuel efficiency is improved.

Although the swash plate pump whose hydraulic cylinder can change the angle of the swash plate is used as the variable displacement hydraulic pump in the embodiment, the present invention is not limited to this, and other pumps may be used if the discharge amount can be changed. May be. Further, the device according to the present invention may be mounted on an engine equipped with a turbocharger that compresses intake air by using energy of exhaust gas.

[0012]

As described above, according to the present invention, the engine drives the variable displacement hydraulic pump capable of changing the oil discharge amount, and the hydraulic motor is connected to the discharge port of the pump via the pipe line. Then, the motor drives the supercharger that compresses the intake air of the engine, and the actuator controls the discharge amount of the pump based on the pressure of the intake air compressed by the supercharger, so the intake air of the optimum pressure is supplied to the engine. So the vehicle accelerates smoothly. In addition, the efficiency of the engine during acceleration is improved, which improves fuel efficiency.

[Brief description of 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 vertical cross-sectional view showing a state in which a variable displacement hydraulic pump of the apparatus discharges oil from its discharge port to a hydraulic motor or hydraulic equipment.

FIG. 3 is a view showing a state in which the hydraulic pump does not discharge oil from its discharge port to either a hydraulic motor or hydraulic equipment.
Sectional drawing corresponding to.

[Explanation of symbols]

 11 Engine 14 Variable Displacement Type Hydraulic Pump 14d Discharge Port 15 Oil 18 Pipeline 19 Hydraulic Motor 21 Supercharger 22 Actuator

Claims (1)

[Claims] 1. A variable displacement hydraulic pump (14) driven by an engine (11) and capable of changing the discharge amount of oil (15), and a pipe line (18) at a discharge port (14d) of the pump (14). A hydraulic motor (19) connected via the supercharger (21) that is driven by the motor (19) to compress the intake air of the engine (11), and the intake of the intake air compressed by the supercharger (21). A control device for a mechanical supercharger, comprising an actuator (22) for controlling the discharge amount of the pump (14) based on the pressure.