JPH0616051A - Electric vehicle - Google Patents

Abstract

PURPOSE:To provide an electric vehicle which can effectively use a low polution engine, has a long travel distance, and saves time in charging a battery. CONSTITUTION:An electric vehicle has provided therein an engine 1, a generator driven by the engine 1 via a haydraulic pump 9 and a hydraulic motor 2, a battery 3 charged by the generator 2, an electric motor which rotates when powered by the battery 3, a hydraulic pump 5 rotatably driven by the electric motor 4, a hydraulic motor provided at each driving wheel W, and a hydraulic controller for controlling the supply of pressure oil by the hydraulic pump 5 to each hydraulic motor 6. Since the engine drives the generator 2, a substantially regular operation is required, and a low polution non-gasoline fuel can be used. The battery constantly charged by the generator 2 allows a long travel distance and saves time in charging the battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle, and more particularly to an electric vehicle capable of running for a long time.

[0002]

2. Description of the Related Art Electric vehicles are attracting attention as low-pollution vehicles, and methanol engines and hydrogen engines are attracting attention as low-pollution engines with low exhaust emissions.

[0003]

However, since electric vehicles are small and do not have a battery with a sufficient capacity, they have short travel distances, and it takes a long time to charge the batteries. It has not been replaced. Also, the low-pollution engine is not a substitute for the gasoline engine because of its difficulty in transient performance.

The present invention has been made in view of the above background, and provides an electric vehicle that can effectively use a low-pollution engine or the like having a difficulty in transient characteristics, has a long mileage, and requires less battery charging. The purpose is to

[0005]

To explain the structure of the present invention, an internal combustion engine 1 and a generator 2 driven by the internal combustion engine 1 will be described.
A battery 3 charged by the generator 2, an electric motor 4 that rotates by receiving electric power from the battery 3, a hydraulic pump 5 rotationally driven by the electric motor 4, and a hydraulic motor provided on each drive wheel W. 6 and a pressure oil supply control means 7 for controlling the pressure oil supply from the hydraulic pump 5 to each hydraulic motor 6.

Instead of the hydraulic motor 6, an electric motor 41 may be provided on each drive wheel W. In this case, the battery 3 is used.
The electric power supply control means 8 for controlling the electric power supply to each electric motor 41 is provided.

[0007]

In the above structure, since the internal combustion engine 1 drives the generator 2, it suffices to perform almost steady operation, and a low-pollution non-gasoline system having a difficulty in transient characteristics can be used. Even when a gasoline type is used, low pollution can be realized because the steady operation can be performed in a region where the exhaust emission is good. In addition, the battery 3
Since the vehicle is always charged by the generator 2, the travelable distance is long, and the labor for battery charging is greatly reduced.

When the electric motor 41 is provided directly on the drive wheels W, no hydraulic system is provided, so that the structure can be simplified.

[0009]

[Embodiment 1] In FIG. 1, an engine 1 is a low-pollution engine using methanol or hydrogen. A hydraulic pump 9 is connected to the engine 1 and pressure oil is supplied to the hydraulic controller 7. The hydraulic controller 7 has a hydraulic pipe, a switching valve provided in the hydraulic pipe, a flow rate adjusting valve, and the like, and opens and closes each of the above valves by an external signal input according to the operating state of the vehicle.

One of the output pipes 71 of the hydraulic controller 7
Is provided with a hydraulic motor 21, and a vehicle-mounted battery 3 is charged by a generator 2 connected to the hydraulic motor 21. The battery power is supplied to the inverter 81, which converts the DC power into AC and drives the AC motor 4 to rotate in response to the signal from the control unit 8. This rotational drive is performed by, for example, performing constant rotation control at different rotational speeds depending on the operating state of the vehicle.

A hydraulic pump 5 is connected to the AC motor 4, and its discharge oil is supplied to the hydraulic controller 7. As the hydraulic pump 5, for example, about 200 kg / c
A m2 of about 100 l / min can be used. Four system output pipes 72A, 7 extending from the hydraulic controller 7
Reference numerals 2B, 72C and 72D lead to hydraulic motors 6 provided on the four drive wheels W in front of and behind the vehicle, respectively. The hydraulic controller 7 includes an accumulator 73 for reducing pulsation and accumulating pressure.
Is provided, and the oil supply pipe 74 is connected from the oil tank 75. In addition, an output pipe 76 extending to the accessories is extended.

In the above structure, the engine 1 is appropriately operated at a substantially constant speed so as to maintain the charged state of the battery 3 appropriately. Therefore, transient response is not required, so that a low-pollution engine such as a methanol engine can be preferably used. Further, even when a gasoline engine is used, the engine can be operated only in a region where the exhaust emission is good, so that environmental deterioration can be prevented to a minimum.

The output oil of the hydraulic controller 7 rotates the hydraulic motor 21 to drive the generator 2 and the battery 3 is charged. Battery power is supplied to the AC motor 4 via the inverter 81, the hydraulic pump 5 is rotated, and the pressure oil is appropriately supplied to the hydraulic motor 6 of each drive wheel W via the output pipe of the hydraulic controller 7. Switching of pressure oil to each hydraulic motor and increase / decrease of oil amount are performed at high speed by an actuator device using a piezo element,
The forward / reverse rotation and the rotation speed of the drive wheel W are controlled.

Thus, since the battery 3 is constantly charged by the generator 2, the travelable distance of the vehicle becomes long, and the battery charging time can be greatly reduced.

It should be noted that the output oil from the hydraulic pump 9 can be appropriately supplied to each of the output pipes 72A to 72D, and when the vehicle is suddenly accelerated, the hydraulic pump 5 is used as the hydraulic oil. High pressure can be obtained by adding 9 pressure oils. Of course, if sufficient torque can be obtained only by the hydraulic pump 5, this is unnecessary.

Since the hydraulic pump 9 has a hydraulic pressure that is approximately the same as the hydraulic pump 5 and the amount of oil that is generated is approximately 1.5 times that of the hydraulic pump 5, it is approximately half the size of a conventional engine of a vehicle of approximately the same size. Which also improves fuel economy and exhaust emissions. The engine 1 may be started by a starter motor similar to the conventional one, or by a hydraulic motor operated by accumulator 73 pressure accumulation.

[0017]

Second Embodiment As shown in FIG. 2, each drive wheel W may have a built-in AC motor 41, and the control unit 8 may directly control the rotation of the AC motor 41 of each drive wheel W via an inverter 81. According to this, the large-sized AC motor 4, the hydraulic pump 5, and the piping system attached to the same in the first embodiment are unnecessary, and the installation space can be reduced.

If the torque generated by each AC motor 41 is sufficient, the hydraulic motor 6 for each drive wheel W can be omitted, and the labor and space for piping can be further reduced.

In each of the above embodiments, when it is not necessary to supply auxiliary hydraulic oil to the hydraulic motors 6 of the drive wheels W, the hydraulic pump 9 and the hydraulic motor 21 are omitted, and the generator 2 and the engine 1 are connected. You may connect directly.

Further, the hydraulic energy generated in the hydraulic motor 6 of each drive wheel W during deceleration of the vehicle is transferred to the accumulator 73.
Alternatively, the battery 3 may be regenerated into the battery 3 via the hydraulic motor 21 and the generator 2.

[0021]

As described above, according to the electric vehicle of the present invention, it is possible to travel a long distance without charging the battery, and it is highly practical as a low-pollution vehicle.

[Brief description of drawings]

FIG. 1 is a drive system diagram of an electric vehicle showing an embodiment of the present invention.

FIG. 2 is a drive system diagram of an electric vehicle showing another embodiment of the present invention.

[Explanation of symbols]

 1 Engine (Internal Combustion Engine) 2 Generator 3 Battery 4, 41 AC Motor (Electric Motor) 5 Hydraulic Pump 6 Hydraulic Motor 7 Hydraulic Controller (Pressure Oil Supply Control Means) 8 Control Unit (Power Supply Control Means)

Claims (2)

[Claims] 1. An internal combustion engine, a generator driven by the internal combustion engine, a battery charged by the generator, an electric motor that rotates by receiving electric power supplied from the battery, and a hydraulic pump driven by the electric motor. An electric vehicle comprising: a hydraulic motor provided on each drive wheel; and a pressure oil supply control means for controlling pressure oil supply from the hydraulic pump to each hydraulic motor. 2. An internal combustion engine, a generator driven by the internal combustion engine, a battery charged by the generator, an electric motor provided on each drive wheel, and a power supply from the battery to each electric motor. An electric vehicle having a power supply control means for controlling.