JPH08308005A - Motor driven vehicle - Google Patents

Abstract

PURPOSE: To facilitate the management of a maintenance time by providing consumed amount detecting means for detecting the value corresponding to the consumed amount of a motor component and storage means for storing a reference value, and generating an alarm when the detected value becomes the reference value or more. CONSTITUTION: A microcomputer 1 is driven by power supplied from a battery 3, receives outputs from a keyboard 7, a current detector 5 and a rotary encoder 6, and controls a driving circuit 4 and a display unit 8. The output pulses from the encoder 6 at the time of traveling a vehicle are counted, and the traveled distance S of the vehicle is integrated. When the integrated value St arrives at the maximum runnable distance P1 stored in the ROM of the microcomputer 1 converted, for example, in terms of a brush life, the unit 8 displays an alarm of the effect that maintenance time, i.e., a brush replacing time comes. Thus, maintenance can be rationally managed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven vehicle, and more particularly to a device for warning the maintenance time of a motor in an electric golf cart or forklift driven by a motor.

[0002]

2. Description of the Related Art Conventionally, in this type of vehicle, the brush and the commutator are worn out due to the contact between the brush and the commutator of the motor, and the bearing is worn out. There is.

[0003]

However, when a plurality of vehicles are used, there is a problem that it is not easy to properly manage the maintenance time because the maintenance time varies depending on the introduction timing.

When the vehicle load, that is, the motor load changes, the degree of wear of the brush, commutator, and bearing changes, so that the maintenance period is uniquely determined only by the period of use of the vehicle. There is also the problem that it is difficult.

The present invention has been made in consideration of such circumstances, and measures the actual mileage of the vehicle and the motor current, and automatically calculates and warns the maintenance time based on the result. A motor-driven vehicle provided with a device is provided.

[0006]

SUMMARY OF THE INVENTION In a vehicle driven by a motor, the present invention detects a consumption amount detecting means for detecting a value corresponding to the consumption amount of a motor component, a storing means for storing a reference value, and a detecting means. There is provided a motor-driven vehicle equipped with a comparison means for comparing the detected value with a reference value and a warning means for giving a warning when the detected value becomes equal to or higher than the reference value.

The vehicle referred to in the present invention is an electric vehicle driven by a motor, and examples thereof include a golf cart for carrying a golf bag at a golf course, a carrier for carrying articles in a factory, a forklift, and the like. The life of (consumable) parts of motors that drive such vehicles, such as brushes, commutators, and bearings, generally depends on the distance traveled by the vehicle and the motor current. Life shortening means
As is well known.

The consumption amount of the motor parts substantially corresponds to the integrated value of the traveling distance of the vehicle when the motor current (load) is constant. Therefore, the consumption amount detecting means for detecting the value corresponding to the consumption amount of the motor parts is , It can be constituted by an integrating means for integrating the traveling distance of the vehicle.

Further, since the consumption amount of the motor component substantially corresponds to the integral value of the motor current when the vehicle speed is constant, the consumption amount detecting means for detecting the value corresponding to the consumption amount of the motor component is the motor current. Can be composed of an integrating means for integrating with time.

Further, when the vehicle travels almost the same stroke repeatedly, the integral value of the motor current is calculated when the vehicle travels first (trial run). Then, the maximum runnable distance (parts life converted into distance) is calculated from the "relationship between the traveled distance and motor current integrated value and the part life (maximum runnable distance)" that was experimentally obtained in advance, and the calculated value is used as a reference value. And Then, if the warning means is caused to warn when the actual accumulated travel distance reaches the reference value, it is possible to accurately detect the service life of the parts such as the brush, the commutator and the bearing by measuring only the distance. .

Therefore, in this case, according to the present invention, the consumption amount detecting means is composed of integrating means for integrating the traveling distance of the vehicle, the input means for inputting an arbitrary trial running distance, and the motor current are integrated over time. And a reference value calculating means for calculating a maximum travelable distance based on an integrated value of a motor current when the vehicle travels a test distance and setting the calculated value as a reference value in the storing means. To be done.

Further, the motor current integrating means can be composed of a sampling means for sampling the motor current in a predetermined cycle and an integrating means for integrating the sampled current values.

The integrating means for integrating the traveling distance of the vehicle is a tachometer generator or a rotary encoder for detecting the motor speed or the traveling speed, and integrates (integrates) the output thereof.
It can be configured by combining with a circuit for

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. The present invention is not limited to this. FIG. 1 is a block diagram showing an embodiment of the present invention, and 1 is a microcomputer (hereinafter referred to as a microcomputer) including a CPU, a ROM and a RAM.

2 is a DC motor with a brush for driving the vehicle,
3 is a battery, 4 is electric power from the battery 3, and the microcomputer 1
Is a drive circuit that supplies an armature voltage to the motor 2 under the control of the above command, and a current detector (for example, a shunt resistor) 5 that detects a motor current (armature current) of the motor 2.

Reference numeral 6 is a rotary encoder for detecting the number of rotations of the motor 2, 7 is a keyboard for inputting various maintenance modes, test run distances and vehicle start / stop commands, and 8 is a brush or commutator. It is an indicator (for example, an LED or a liquid crystal display) for displaying a warning when it is necessary to replace a component of the motor 2 such as a bearing.

The microcomputer 1 is driven by the electric power supplied from the battery 3 and receives the outputs from the keyboard 7, the current detector 5 and the rotary encoder 6 to control the drive circuit 4 and the display 8. It is supposed to do.

The operation in such a configuration will be described with reference to the flowchart shown in FIG. In the present embodiment, among the replacement parts of the motor 2, the maintenance of the brush that needs to be replaced most frequently will be described. When the vehicle is a vehicle such as a factory truck in which the load fluctuation during traveling is relatively small, the user specifies mode 1 as the maintenance mode on the keyboard 7 (step S1).

Then, the output pulses from the rotary encoder 6 during traveling of the vehicle are counted, and the traveling distance S of the vehicle is counted.
Is integrated (step S2). Then, the integrated value S
When t is converted from the brush life in advance and reaches the maximum travelable distance R1 stored in the ROM of the microcomputer 1 (step S3), the display 8 displays a warning indicating that it is the maintenance time, that is, the brush replacement time. (Step S
4).

Next, when the vehicle is running at a substantially constant speed, it is used in vehicles with large load fluctuations, such as a carrier whose load weight fluctuates or a golf cart which runs at a constant speed in a highly undulating place. The person specifies the mode 2 on the keyboard 7 (step S5). When the vehicle is traveling, the output of the current detector 5 is sampled at a predetermined cycle and the motor current Ia is integrated (step S6). Then, the integrated value It is converted in advance from the brush life and the R of the microcomputer 1 is changed.
When the maximum integrated value R2 stored in the OM is reached (step S7), a warning is displayed on the display 8 (step S7).
4).

Next, in a vehicle such as a golf cart in which speed fluctuations and load fluctuations during traveling are relatively large and the vehicle repeatedly travels in the same place, the user specifies mode 3 on the keyboard 7. Together (step S8),
A trial run distance (distance for one round in a golf cart) S1 is input (step S9).

Then, at the same time as the traveling distance S of the vehicle is integrated, the motor current Ia is integrated (step S1).
0). When the integrated distance St reaches the trial run distance S1 (step S11), the maximum runnable distance R3 corresponding to the brush life is stored in advance in the ROM of the microcomputer 1 based on the integral value It of the motor current and the trial run distance S1. It is read from the stored table (step S12).

Then, the traveling distance S of the vehicle is continuously integrated (step S13), and when the integrated value St reaches the distance R3 (step S14), a warning is displayed (step S4). In the case of mode 3, if the trial run distance S1 is displayed at the same time as how many more times it will run, the maximum runnable distance R3 (maintenance time) will be displayed at the same time, which will be very convenient when used. .

[0024]

According to the present invention, a value corresponding to the amount of wear of a motor component is detected and a warning is given when the value exceeds a reference value, so that the maintenance time of the motor is extremely controlled. It will be easier. Further, it is possible to accurately manage the maintenance period of the motor even on an axis having a large load variation or traveling speed variation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment.

[Explanation of symbols]

 1 Microcomputer 2 Motor 3 Battery 4 Driving Circuit 5 Current Detector 6 Rotary Encoder 7 Keyboard 8 Display

Claims (5)

[Claims] 1. In a vehicle driven by a motor,
A consumption amount detecting means for detecting a value corresponding to the consumption amount of the motor component, a storing means for storing the reference value, a comparing means for comparing the detected value with the reference value, and the detected value is equal to or more than the reference value. A motor-driven vehicle equipped with warning means to warn when 2. The motor-driven vehicle according to claim 1, wherein the consumption amount detecting means includes an integrating means for integrating the traveling distance of the vehicle, and the integrated value is a value corresponding to the consumption amount of the motor component. 3. The motor-driven vehicle according to claim 1, wherein the consumption amount detecting means includes an integrating means for temporally integrating the motor current, and the integrated value is a value corresponding to the consumption amount of the motor component. 4. The consumption amount detecting means includes an integrating means for integrating the traveling distance of the vehicle, an input means for inputting an arbitrary trial traveling distance, an integrating means for temporally integrating the motor current, and a traveling for the trial traveling distance. The motor-driven vehicle according to claim 1, further comprising: a reference value calculating unit that calculates a maximum travelable distance based on a motor current integral value at that time and sets the calculated value as a reference value in the storage unit. 5. The motor drive according to claim 3, wherein the integrating means for integrating the motor current with time comprises sampling means for sampling the motor current in a predetermined cycle and integrating means for integrating the sampled current value. Vehicle.