JP2653733B2 - Device to control hydraulically driven supercharger and auxiliary brake - Google Patents

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 hydraulically driven supercharger and an auxiliary brake. More specifically, the present invention relates to a device that improves the starting performance of a vehicle and the braking performance of an exhaust brake.

[0002]

2. Description of the Related Art Conventionally, there has been known an engine provided with a turbocharger for compressing intake air by utilizing energy of exhaust gas of the engine in order to improve acceleration of a vehicle.
However, this turbocharger has a problem that it is hardly able to compress the intake air of the engine because the rotation speed of the engine is low when the vehicle starts. Therefore, as one of means for improving the startability of a vehicle having a turbocharged engine, a supercharger that compresses the intake air of the engine by using hydraulic oil generated by a hydraulic pump driven by the engine has been adopted. I have.

On the other hand, large vehicles such as trucks are known to be equipped with an exhaust brake for increasing the internal resistance of the engine by blocking the flow of exhaust gas of the engine in order to increase the braking force of the engine brake. . However, when a heavy object is loaded and the vehicle goes down a steep slope, there is a risk that the exhaust brake alone cannot sufficiently brake the vehicle. Therefore, an eddy current type or fluid type retarder is attached to the main shaft of the transmission,
These retarders reduce the rotational speed of the main shaft to brake the vehicle.

[0004]

However, the above-described supercharger and retarder have no components common to both, and have a problem that the number of components and the vehicle weight are greatly increased.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the acceleration at the time of starting a vehicle by increasing the number of parts and increasing the weight.
It is another object of the present invention to provide a hydraulically driven supercharger capable of increasing a braking force when braking a vehicle and a device for controlling an auxiliary brake.

[0006]

A configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 and 4 corresponding to the embodiment. An apparatus for controlling a hydraulically driven supercharger and auxiliary brake according to the present invention includes a variable displacement hydraulic pump 14 driven by an engine 11 mounted on a vehicle and capable of changing a discharge amount of oil 15, and a discharge port of the pump 14. 14
d through a main line 18 and a hydraulic motor 19 for driving a supercharger 21 for compressing intake air of the engine 11.
And hydraulic devices 23 and 53 connected via a branch line 22 branched from the main line 18, and the main line 18 and the branch line 2.
Control valve 2 which is provided at a branch point 2 and can adjust the amount of oil supplied to the motor 19 and the hydraulic device 23, respectively.
4, a sensor 29 for detecting the driving state of the vehicle, and a controller 31 for controlling the pump 14 and the valve 24 based on the detection output of the sensor 29.

[0007]

When the vehicle starts moving, the controller 31 controls the variable displacement hydraulic pump 14 so as to discharge a predetermined amount of oil 15 based on the detection output of the sensor 29, and controls all of the oil 15 discharged from the pump 14. Alternatively, the control valve 24 is controlled so that most of the air is supplied to the hydraulic motor 19, and the supercharger 21 is driven by the motor 19 to compress the intake air of the engine 11. When the vehicle decelerates, the controller 31 controls so that all of the oil 15 discharged from the pump 14 is supplied to the hydraulic device 23 or 53, and the hydraulic device 23 or 53 increases the hydraulic pressure at the discharge port 14d of the pump 14. Then, a load is applied to the engine 11. Further, when the vehicle travels at a constant speed, the controller 31 controls the pump 14 so that the pump 14 does not discharge the oil 15.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1 to FIG.
The input shaft 14a of a variable displacement hydraulic pump 14 is connected to one crankshaft 11a via gears 12 and 13. In this example, the pump 14 is a swash plate 1 pivotally supported in a case 14e.
This is a swash plate pump capable of changing the discharge amount of oil 15 by changing the inclination angle of 4b. Inlet 14c of pump 14
Is connected to an oil tank 16 via a suction pipe 17, and a hydraulic motor 19 is connected to the discharge port 14 d via a main 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 line 22 branched from main line 18
Is connected to the hydraulic device 23 in this example, and the hydraulic device 23 is a hydraulic motor 23a for braking and this motor 23a in this example.
a has a generator 23c connected via an output shaft 23b. A control valve 24 is provided at a branch point between the main line 18 and the branch line 22, and in this example, the control valve 24 is a three-port two-position switching solenoid valve. When the valve 24 is turned on, the discharge port 14d of the pump 14 communicates with the suction port 19b of the hydraulic motor 19, and when the valve 24 is turned off, the discharge port 14d of the pump 14 communicates with the suction port 23d of the brake hydraulic motor 23a. . An oil cooler 26 for cooling the oil 15 is connected to the branch pipe 22 on the discharge port 23e side of the hydraulic motor 23a for brake, and a main pipe 18 between the control valve 24 and the hydraulic motor 19 is connected.
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 14 fitted with a spline line
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.
i, and a plurality of pistons 14j slidably inserted into i. The case 14e has a case body 14k having an opening on one end surface and a cover 14m for sealing the opening. The cover 14m has an inlet 14c for guiding oil 15 to the cylinder hole 14i and an oil from the cylinder hole 14i. A discharge port 14d for discharging the nozzle 15 is formed. A gear 13 is fixed to the tip of the input shaft 14a projecting from the case 14e, and the gear 13 meshes with the 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 is formed with a spherical held portion 14n, and a plurality of slidable plates 14b are formed on one surface of the swash plate 14b. Of the shoe 14r is pressed by the holding 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.

A piston rod 27a of a spring return type hydraulic cylinder 27 is connected to the upper end of the swash plate 14b, and a switching valve 28 for reciprocating the piston rod 27a is connected to the cylinder 27. When the switching valve 28 is turned on, the cylinder 27 rotates the swash plate 14b to the position shown in FIG. In this state, the cylinder block 14h and the piston 14j rotate together with the input shaft 14a, and the piston 14j is guided by the swash plate 14b so that the cylinder hole 14
i, the oil 1 sucked from the suction port 14c
5 is discharged from the discharge port 14d. When the switching valve 28 is turned off, the cylinder 27 is moved to the swash plate 14b.
Is rotated to the position shown in FIG. In this state, the piston 14j does not reciprocate in the cylinder hole 14i.
5 is not sucked from the suction port 14c and is not discharged from the discharge port 14d.

The sensor 29 for detecting the driving state of the vehicle includes a shift sensor 29a for detecting the position of a shift lever of a transmission (not shown), a rotation sensor 29b for detecting the rotation speed of the crankshaft 11a of the engine 11, and an accelerator pedal. It has a load sensor 29c for detecting the amount of depression, a vehicle speed sensor 29d for detecting the vehicle speed, and a brake sensor 29e for detecting the operation and non-operation of the exhaust brake. A shift sensor 29a, a rotation sensor 29b, a load sensor 29c,
The detection outputs of the vehicle speed sensor 29d and the brake sensor 29e are connected to the control input of the controller 31, and the control output of the controller 31 is connected to the control valve 24 and the switching valve 28 (FIG. 1).

The operation of the thus-configured device for controlling the hydraulically driven supercharger and auxiliary brake will be described. To start the vehicle, the shift lever (not shown) is switched to the first speed or the second speed and the accelerator pedal is depressed. At this time, the load sensor 29c detects that the accelerator pedal is greatly depressed, the vehicle speed sensor 29d detects that the vehicle speed is low, and the brake sensor 29e detects that the exhaust brake is not operating. The controller 31 includes a shift sensor 29a, a rotation sensor 29b, a load sensor 29c, a vehicle speed sensor 29d, and a brake sensor 2
The switching valve 28 is switched to rotate the swash plate 14b of the variable displacement hydraulic pump 14 to the position shown in FIG. 2 based on the detection output of 9e, and at the same time, the discharge port 14d of the pump 14 is connected to the suction port 19b of the hydraulic motor 19. The control valve 24 is switched so as to communicate. As a result, the oil 15 discharged from the pump 14 is pressure-fed as shown by a dashed line arrow in FIG. 1 and the hydraulic motor 19 drives the supercharger 21, so that the intake air of the engine 11 is compressed by the supercharger 21, and the vehicle Is accelerated smoothly.

When the vehicle is decelerated, the accelerator pedal is not depressed, and in the case of a large vehicle having 5th to 6th speed shifts, the shift lever is normally switched to the 4th or 5th speed.
The exhaust brake operates. At this time, the rotation sensor 29b detects that the rotation speed of the crankshaft 11a is high, the load sensor 29c detects that the accelerator pedal is not depressed, the vehicle speed sensor 29d detects that the vehicle speed is high, and the brake sensor 29e detects that the exhaust brake has been activated. The controller 31 outputs the output port 14 d of the pump 14 based on the detection output of the sensor 29.
The control valve 24 is switched so as to communicate with the suction port 23d of the brake hydraulic motor 23a. As a result, the oil 15 is pumped as indicated by the two-dot chain line arrow in FIG. 1 and the brake hydraulic motor 23a drives the generator 23c to increase the oil pressure at the discharge port 14d of the pump 14, so that the oil is supplied to the crankshaft 11a. Such a load increases, the braking force of the vehicle increases, and the vehicle is smoothly decelerated.

Further, when the vehicle is driven at a constant speed, the controller 31 switches the switching valve 28 based on the detection output of the sensor 29 so as to rotate the swash plate 14b of the pump 14 to the position shown in FIG. As a result, the pump 14
Since no 5 is discharged, the vehicle can run at a constant speed.

In the embodiment, a hydraulic motor for braking and a generator driven by this motor are described as hydraulic equipment, but this is an example, and the hydraulic equipment 53 may be a power steering device as shown in FIG. . 4, the same reference numerals as those in FIG. 1 denote the same components. In this case, when the vehicle starts, the control valve 24 supplies the oil 15 to the hydraulic motor 19 that drives the supercharger 21 by the variable displacement hydraulic pump 14,
The power steering device 3 can be supplied with oil 15 to such an extent that its operation is not hindered. Hydraulic devices other than the hydraulic motor for braking and the power steering device may be used as long as a load can be applied to the engine. Further, in the embodiment, the swash plate pump in which the angle of the swash plate can be changed by a hydraulic cylinder is described as the variable displacement hydraulic pump, but the present invention is not limited to this, and other pumps may be used as long as the discharge amount can be changed. . Further, in the embodiment, the shift sensor, the rotation sensor, the load sensor, the vehicle speed sensor, and the brake sensor have been described as the sensors. However, all of the above sensors may not be used as long as the switching timing of the supercharger and the hydraulic device can be detected. A sensor that detects the driving state of the vehicle other than the above sensors may be used. Further, the device according to the present invention may be mounted on an engine equipped with a turbocharger that compresses intake air by utilizing the energy of exhaust gas.

[0016]

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 pump connected via the main pipe to the discharge port of the pump. The motor drives a supercharger for compressing the intake air of the engine, connects hydraulic equipment via a branch line branched from the main line, and controls the motor and hydraulic pressure at a control valve provided at a branch point between the main line and the branch line. The amount of oil supplied to the equipment is adjusted, and the sensor detects the driving state of the vehicle,
Since the controller controls the pump and the valve based on the detection output of the sensor, it is possible to improve the acceleration of the vehicle when starting and to increase the braking force when braking the vehicle. Further, since the supercharger and the hydraulic device use the same hydraulic circuit, the number of parts is smaller than that of the vehicle having the supercharger and the eddy current type or fluid type retarder, and the weight of the vehicle is not increased.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a device for controlling a hydraulically driven supercharger and an auxiliary brake 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.

FIG. 4 is a configuration diagram corresponding to FIG. 1 showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Engine 14 Variable displacement hydraulic pump 14d Discharge port 15 Oil 18 Main pipeline 19 Hydraulic motor 21 Supercharger 22 Branch pipeline 23, 53 Hydraulic equipment 24 Control valve 29 Sensor 31 Controller

Continuation of the front page (56) References JP-A-2-252922 (JP, A) JP-A-1-318719 (JP, A) JP-A-54-55218 (JP, A) Jpn. , U) Japanese Utility Model Showa 62-158130 (JP, U) Japanese Utility Model Showa 61-181834 (JP, U) Japanese Patent Publication No. 59-51649 (JP, B2)

Claims (1)

(57) [Claims] 1. A variable displacement hydraulic pump (14) driven by an engine (11) mounted on a vehicle and capable of changing a discharge amount of oil (15), and a discharge port (14d) of the pump (14). A hydraulic motor (19) connected via a main line (18) for driving a supercharger (21) for intake compression of the engine (11), and a branch line (22) branched from the main line (18) And a hydraulic device (23, 53) connected to the motor (19) and the hydraulic device (23) provided at a branch point between the main pipeline (18) and the branch pipeline (22). A control valve (24) capable of adjusting an oil amount, a sensor (29) for detecting an operation state of the vehicle, and the pump (14) and the valve (24) based on a detection output of the sensor (29). And a controller (31) for controlling a hydraulically driven supercharger and an auxiliary brake.