JPH054702A - Garbage collecting vehicle - Google Patents

Abstract

PURPOSE:To lower noise, NOx, and black-smoke-tendency at the time of loading/unloading of garbage by a garbage collecting vehicle. CONSTITUTION:A garbage collecting vehicle is provided with a hydraulic pump 10, which operates a loader 11 for loading of garbage, a motor 6, which drives this hydraulic pump 10, an inverter circuit 4, which converts the alternating electric power, which is generated by an inductor 2 connected to an engine 1, at the time of loading of the garbage, into a direct current electric power and supplies this power to the motor 6, and a battery 3, which stores superfluous, electric power coming from the inverter circuit 4 at the time of loading of the garbage and supplies necessary electric energy to the motor 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse collection vehicle for loading and unloading dust, and more particularly to driving an electric motor for operating a hydraulic pump for operating the refuse loader. In addition, the present invention relates to a dust collection vehicle that realizes low noise and improved exhaust gas by supplementarily supplying electric power from a battery as well as electric power from an induction machine connected to an internal combustion engine.

[0002]

2. Description of the Related Art In a conventional garbage truck, a hydraulic pump for operating a loader is rotationally driven by an engine. That is, at the time of loading and discharging dust, the driver operates the PTO operating lever so that the power of the engine is transmitted to the hydraulic pump via the power take-off device (power take-off device: PTO).

[0003]

By the way, in the conventional garbage collecting vehicle as described above, the load of the loader at the time of loading or discharging dust is subject to periodic fluctuations during the loading or discharging process. Repeat (see reference numeral 1 in FIG. 3). Therefore, during the operation of loading or discharging dust, the driver continues to step on the accelerator so that the engine speed increases to a speed that can correspond to the maximum value of the fluctuating loader load, or It was necessary to continue to pull the accelerator lever by electric control.

As described above, in the conventional garbage collection vehicle, the engine speed is increased to, for example, about 1,000 to 1,200 rpm in order to obtain a desired hydraulic pressure during the loading and discharging of the dirt. Therefore, as shown in the graph of FIG. 2, there are problems such as noise and exhaust gas in urban areas.

The present invention has been made in view of the above problems of the prior art. In order to drive an electric motor for operating a hydraulic pump for operating a dust loader, the electric motor is connected to an internal combustion engine. It is an object of the present invention to provide a dust collection vehicle that realizes low noise and improved exhaust gas by supplementarily supplying not only electric power from the induction machine but also electric power from the battery.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a refuse collecting vehicle of the present invention comprises a hydraulic pump for operating a loader for loading the dust, an electric motor for driving the hydraulic pump, and a load for the refuse. An internal combustion engine driven at the time of loading, an induction machine connected to the main shaft of the internal combustion engine, and an inverter that converts the AC power generated by the induction machine at the time of loading dust to DC power and supplies the DC power to the motor. Circuit,
A battery that stores excess electric energy from the inverter circuit when loading dust and supplies electric energy required for the electric motor.

[0007]

In the refuse collection vehicle according to the present invention, the hydraulic pump for operating the loader for loading the dust, the electric motor for driving the hydraulic pump, and the AC power generated by the induction machine at the time of loading the dust are converted to DC. An inverter circuit for converting the electric power to supply the electric power to the electric motor and a battery for storing extra electric energy from the inverter circuit when dust is loaded and supplying electric energy required for the electric motor are provided. Therefore, the energy from the engine and the energy from the battery can be hybridized and supplied to the electric motor for driving the hydraulic pump of the loader.

Therefore, even if the load of the loader fluctuates periodically during loading and discharging of dust, the engine speed is kept in a lower rotation range than before, and the energy accompanying the change of the load of the loader is kept. It is possible to make up for the temporary shortage with energy from the battery.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the electrical construction of a refuse collecting vehicle according to an embodiment of the present invention.

In this embodiment shown in this block diagram, a cage-type polyphase induction machine 2 having a rotor portion directly connected to a main shaft of an engine 1 which is an internal combustion engine, and an alternating current from the cage-type polyphase induction machine 2 An inverter circuit 4 that converts electric power into direct current power and supplies it to a battery 3 and a motor 6 which is an electric motor, and also converts a direct current voltage of the battery 3 into an alternating current voltage having a desired frequency and applies this to a squirrel cage multiphase induction machine 2. And an inverter control circuit 5 for generating a control signal for setting the frequency of the AC side voltage of the inverter circuit 4 based on signals from sensors. This inverter control circuit 5
Includes means for generating a control command by the driver according to the driving of the automobile.

The inverter control circuit 5 controls the frequency of the AC power when the inverter circuit 4 converts the DC power into the AC power to control the rotation speed of the rotating magnetic field generated in the stator portion of the induction machine 2. This realizes braking and auxiliary acceleration suitable for efficient running of the vehicle. That is, the inverter circuit 4 induces the DC voltage from the battery 3 in the stator portion of the induction machine 2 at a rotation speed lower than the rotation speed of the rotor portion of the induction machine 2 (engine rotation speed). When the AC voltage is converted into an AC voltage having a frequency suitable for, the induction machine 2 operates as a generator and can apply a braking torque to the vehicle. Further, the inverter circuit 4 induces a DC voltage from the battery 3 in the stator portion of the induction machine 2 at a rotation speed higher than the rotation speed of the rotor portion of the induction machine 2 (engine rotation speed). When converting to an AC voltage having a frequency suitable for the above, the induction machine 2 operates as an electric motor and can give an auxiliary driving force to the main shaft of the engine 1 (see JP-A-63-206101). Therefore, during braking of the vehicle, the AC power induced by the induction machine 2 is converted into DC power via the inverter circuit 4 and stored in the battery 3, and also stored in the battery 3 during start / acceleration of the vehicle. DC power is taken out, converted into AC by the inverter circuit 4, and input to the induction machine 2.

The DC power from the inverter circuit 4 and the DC power from the battery 3 are both DC-
It is supplied to the DC converter 7, where it is stepped down to a predetermined voltage and supplied to the inverter control circuit 5, the controller 9 for controlling the motor 6, and other vehicle electrical components 8.

The motor 6 is connected to the inverter circuit 4 and the battery 3. Therefore, both the electric power from the inverter circuit 4 and the electric power from the battery 3 can be supplied to drive the motor 6. The power of the motor 6 is supplied to the hydraulic pump 10, and the loader 11 is operated by the hydraulic pump 10 to load and discharge dust.

Next, the operation of this embodiment will be described with reference to FIG.

In FIG. 3, reference numeral l indicates the drive power of the loader load which fluctuates periodically during the loading operation of dust, and reference character T indicates one cycle (about 10 to 10) of the drive power l of the loader load. 13 seconds) is shown. In this embodiment, the rotation speed of the engine 1 at the time of loading dust is set to 750 rpm which can induce an electric power of 8.8 kw, for example, and the engine output is converted into AC electric power by the induction machine 2. The AC power is converted into DC power by the inverter circuit 4 and the inverter control circuit 5 and supplied to the motor 6.

At the time of loading of dust, the load of the loader 11 is not constant, as indicated by l in FIG. 3, so that the energy supplied from the engine output to the loader 11 and the drive power l of the load are: There is a difference (excess or shortage of energy) between the two. Therefore, in this embodiment, the energy corresponding to this difference is adjusted by charging the battery 3 or discharging the battery 3. That is, at t1, t3, and t4 in the cycle T of FIG. 3, the driving power l of the loader load is smaller than the electric power (8.8 kw) generated from the engine output, so the output from the inverter circuit 4 is output. The surplus electric power (see the shaded area A in FIG. 3) other than the electric power 1 required for driving the motor 6 among the generated DC electric power is charged in the battery 3. See also FIG.
At t2 in the cycle T of, the driving power l of the loader load is the power generated from the engine output (8.8 k
w) is larger than w), the shortage of the electric power 1 required for driving the motor 6 that cannot be covered by the engine output (see the hatched portion B in FIG. 3) is supplemented by the supply from the battery 3.

As described above, in the present embodiment, the engine speed is set to a speed (750 kW) that generates electric power (8.8 kw) smaller than the maximum value of the drive power l of the fluctuating loader load.
The power generated from the engine output for the power 1 required to drive the loader load (8.8k)
Since the excess / deficiency of w) is adjusted by charging or discharging the battery 3, the hydraulic pump 1
The output of 0 can cope with the change of the loader load l. Therefore, according to the present embodiment, it is possible to significantly reduce the noise, Nox (nitrogen oxide), HC (hydrocarbon), etc. from the dust collecting vehicle during the dust loading operation as compared with the conventional case (see FIG. 2). ). Further, since the output of the motor 6 is controlled by the controller 9, it becomes possible to form isolation between the output of the motor 6 and the load fluctuation of the engine.

[0019]

As described above, in the dust collecting vehicle of the present invention, the hydraulic pump for operating the loader for loading the dust, the electric motor for driving the hydraulic pump, and the induction machine for loading the dust are used. An inverter circuit that converts the generated AC power into DC power and supplies the DC power to the electric motor, and stores excess electric energy from the inverter circuit when dust is loaded and also supplies the necessary electric energy to the electric motor. Because it has a battery,
Energy from the engine and energy from the battery can be hybridized and supplied to the electric motor for driving the hydraulic pump of the loader.

Therefore, even if the load of the loader fluctuates periodically when loading and unloading dust, the engine speed is kept in a lower rotation range than before and the temporary shortage of energy is the energy from the battery. 2, it is possible to realize low noise, low Nox, low black smoke, etc. at the time of loading and discharging dust in the dust collection vehicle, as shown in FIG.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a garbage truck according to an embodiment of the present invention.

FIG. 2 is a graph for explaining the effect of the present invention.

FIG. 3 is a diagram for explaining the operation of the present embodiment.

[Explanation of symbols]

 1 engine 2 squirrel cage polyphase induction machine 3 battery 4 inverter circuit 5 inverter control circuit 6 motor 10 hydraulic pump 11 loader

Claims (1)

Claim: What is claimed is: 1. A hydraulic pump for operating a loader for loading dust, an electric motor for driving the hydraulic pump, an internal combustion engine driven when loading dust, and a main shaft of the internal combustion engine. An induction machine connected to the, an inverter circuit for converting the AC power generated by the induction machine at the time of loading of dust into DC power and supplying this to the electric motor, and from the inverter circuit at the time of loading dust A garbage collection vehicle, comprising: a battery that stores excess electric energy and supplies electric energy required for the electric motor.