JP2653734B2 - Device for controlling 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 means for improving the startability of a vehicle equipped with a turbocharged engine, a supercharger that compresses intake air of the engine by using pressure oil generated by a hydraulic pump driven by the engine is employed.

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 FIG. 1 corresponding to an embodiment. An apparatus for controlling a hydraulically driven supercharger and an auxiliary brake according to the present invention is driven by an engine 11 mounted on a vehicle and includes a first port 14d and a second port 1d.
A swash plate type hydraulic pump 14 having a hydraulic pump 4c and capable of changing the discharge amount and discharge direction of the oil 15; and a second port 14c connected to the first port 14d via the main suction line 18 and the first check valve 41. The oil tank 16 is connected to the second suction port 17 via the auxiliary suction pipe 17 and the second check valve 42, and the intake port of the engine 11 is connected to the second port 14c via the main discharge pipe 22 and the third check valve 43. A hydraulic motor 19 for driving a supercharger 21 for compression;
Hydraulic device 23 connected via fourth and fourth check valves 44
And a sensor 29 for detecting a driving state of the vehicle, and a sensor 2
And a controller 31 for controlling the discharge amount and the discharge direction of the pump 14 based on the detection output of No. 9.

[0007]

When the vehicle starts moving, the controller 31 controls the swash plate type hydraulic pump 14 so as to supply a predetermined amount of oil 15 to the hydraulic motor 19 based on the detection output of the sensor 29, and the motor 19 controls the supercharger 21. When driven, the intake air of the engine 11 is compressed. When the vehicle decelerates, the controller 31 controls the pump 14 so as to supply the oil 15 to the hydraulic device 23, and the hydraulic device 23 increases the oil pressure of the first port 14 d which is the discharge port of the pump 14, and Load. Further, when the vehicle travels at a constant speed, the controller 31 controls the pump 14 so that the oil 15 is not supplied to both the motor 19 and the hydraulic equipment 23.

[0008]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 4, an input shaft 14 a of a swash plate type hydraulic pump 14 is connected to a crankshaft 11 a of an engine 11 of a vehicle via gears 12 and 13, and the pump 14 in this example is provided in a case 14 e. Pivoted swash plate 14
This is a swash plate pump that can change the discharge amount and discharge direction of the oil 15 by changing the inclination angle of b. The first port 14d of the pump 14 is connected to the oil tank 16 via the main suction line 18 and the first check valve 41, and the second port 14c of the pump 14 is connected to the auxiliary suction line 17 and the second check valve 42. Is connected to the oil tank 16. The second port 14c is connected to the hydraulic motor 19 via the main discharge line 22 and the third check valve 43, and the first port 14d is connected to the auxiliary discharge line 24.
And the hydraulic device 23 via the fourth check valve 44. The motor 19 is connected to a supercharger 21 provided on an intake pipe 11b of the engine 11 via an output shaft 19a. In this example, the hydraulic device 23 has a brake hydraulic motor 23a and a generator 23c connected to the motor 23a via an output shaft 23b. An oil cooler 26 for cooling the oil 15 is connected to the auxiliary discharge line 24 on the discharge port 23e side of the brake hydraulic motor 23a, and the oil cooler 26 is connected to the main discharge line 22 between the second check valve 42 and the hydraulic motor 19. The branching relief line 32 is connected to the oil tank 1 via a safety valve 33.
6 (FIG. 1).

As shown in detail in FIGS. 2 to 4, the swash plate type hydraulic pump 14 has an input shaft 14a rotatably inserted into a case 14e via bearings 14f and 14g, and an input shaft 14a.
swash plate 14b loosely fitted in a and pivotally supported in case 14e.
And a cylinder block 14h rotatably housed in the case 14e and spline-fitted to the input shaft 14a.
And a plurality of cylinder holes 14i 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 the piston 14j. The case 14e has a case body 14k having an opening at one end surface and a cover 14m for sealing the opening, and the cover 14m is capable of sucking oil 15 into the cylinder hole 14i or discharging oil 15 from the cylinder hole 14i. 1 port 14d
And a second port 14c. The gear 13 is fixed to the tip of the input shaft 14a protruding from the case 14e,
The gear 13 is a gear 12 fixed to the crankshaft 11a.
Mesh with. 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. Shoe 14r is holding plate 14s
Is pressed. 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 top end of a piston rod 27a of a double-acting hydraulic cylinder 27 is connected to an upper end of the swash plate 14b, and a piston 27b sliding in the cylinder is fixed to a base end of the piston rod 27a. Hydraulic adjusting valves 28 and 2 are provided in two cylinder chambers partitioned by the piston 27b, respectively.
8, the position of the piston 27b is changed by these adjusting valves 28, 28 to rotate and hold the swash plate 14b of the pump 14 at the position shown in FIG. 2, the position shown in FIG. 3, and the position shown in FIG. I can do it. FIG. 2 shows the swash plate 14b.
When the oil 15 in the oil tank 16 is held at the position shown in FIG.
When the swash plate 14b is sucked from the port 14d and discharged from the second port 14c and is held at the position shown in FIG.
Is not sucked or discharged from either of the first port 14d and the second port 14c, and when the swash plate 14b is held at the position shown in FIG. 4, the oil 15 is sucked from the second port 14c and discharged from the first port 14d. It is supposed to be. The position of the piston 27b is determined by a piston position sensor 27c.
Is to be detected.

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. The detection outputs of the piston position sensor 27c, the shift sensor 29a, the rotation sensor 29b, the load sensor 29c, 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 two hydraulic adjustment valves. 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 piston position sensor 27c, a shift sensor 2
9a, a rotation sensor 29b, a load sensor 29c, a vehicle speed sensor 29d, and a hydraulic adjustment valve 28, 28 that rotates the swash plate 14b of the swash plate type hydraulic pump 14 to the position shown in FIG. adjust.
As a result, the oil 15 in the oil tank 16 flows as shown by the one-dot chain line arrow in FIG. 1, and the hydraulic motor 19 drives the supercharger 21, so that the intake of the engine 11 is compressed by the supercharger 21 and the vehicle can smoothly run. Accelerated.

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 adjusts the hydraulic pressure adjusting valves 28, 28 based on the detection outputs of the sensor 29 and the piston position sensor 27c so as to rotate the swash plate 14b of the pump 14 to the position shown in FIG. As a result, the oil 15 in the oil tank 16 flows as shown by a two-dot chain line arrow in FIG.
drive the first port 14 which is the discharge port of the pump 14
Since the hydraulic pressure d is increased, the load applied to the crankshaft 11a 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 adjusts the hydraulic pressure adjusting valves 28, 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, pump 1
Since 4 does not discharge oil 15, the vehicle can run at a constant speed.

In the embodiment, a hydraulic motor for braking and a generator driven by the motor are described as the hydraulic equipment. However, this is merely an example, and if a load can be applied to the engine, a power steering device or other hydraulic equipment may be used. It may be a device. 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 swash plate type hydraulic pump having the first and second ports and capable of changing the discharge amount and discharge direction of the oil.
The second port is connected to the oil tank whose port is connected via the main suction line and the first check valve via the auxiliary suction line and the second check valve, and the main discharge line and the second port are connected to the second port. 3) A hydraulic motor for driving a supercharger for compressing the intake air of the engine is connected via a check valve, and a hydraulic device is connected to the first port via an auxiliary discharge line and a fourth check valve, thereby driving the vehicle. Since the controller controls the discharge amount and the discharge direction of the pump based on the detection output of the sensor that detects the state, it is possible to improve the acceleration at the start of the vehicle and increase the braking force at the time of 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 swash plate type hydraulic pump of the device sucks oil from a first port and discharges oil from a second port.

FIG. 3 is a cross-sectional view corresponding to FIG. 2, showing a state where the pump does not discharge oil from any of a first port and a second port.

FIG. 4 is a sectional view corresponding to FIG. 2, showing a state where the pump sucks oil from a second port and discharges oil from a first port.

[Explanation of symbols]

 Reference Signs List 11 engine 14 swash plate type hydraulic pump 14c second port 14d first port 15 oil 16 oil tank 17 auxiliary suction line 18 main suction line 19 hydraulic motor 21 supercharger 22 main discharge line 23 hydraulic device 24 auxiliary discharge line 29 Sensor 31 Controller 41 First check valve 42 Second check valve 43 Third check valve 44 Fourth check valve

Claims (1)

(57) [Claims] 1. A swash plate type driven by an engine (11) mounted on a vehicle and having a first port (14d) and a second port (14c) and capable of changing a discharge amount and a discharge direction of an oil (15). A hydraulic pump (14), a main suction line (18) and a first check valve connected to the first port (14d).
An oil tank (16) connected via an auxiliary suction line (17) and a second check valve (42) connected to the second port (14c) through the second port (14c); 14c) Main discharge line (22) and third check valve
A hydraulic motor (19) connected through the (43) to drive a supercharger (21) for intake compression of the engine (11); and an auxiliary discharge line (24) and a second discharge port to the first port (14d). (4) a hydraulic device (23) connected via a check valve (44), a sensor (29) for detecting an operating state of the vehicle, and the pump (14) based on a detection output of the sensor (29). A controller for controlling a hydraulically driven supercharger and an auxiliary brake, comprising a controller (31) for controlling a discharge amount and a discharge direction of the supercharger.