CN101669856A - Programmable controller for electric wheel chair - Google Patents
Programmable controller for electric wheel chair Download PDFInfo
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- CN101669856A CN101669856A CN200810151311A CN200810151311A CN101669856A CN 101669856 A CN101669856 A CN 101669856A CN 200810151311 A CN200810151311 A CN 200810151311A CN 200810151311 A CN200810151311 A CN 200810151311A CN 101669856 A CN101669856 A CN 101669856A
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- electric wheel
- wheel chair
- programmable controller
- electric
- motor
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Abstract
The invention relates to a programmable controller for an electric wheel chair, which comprises a control handle, a coded disc rotating wheel, a sensing groove disc and a control circuit, wherein thecontrol handle is arranged on the electric wheel chair; a transmission shaft between a motor and a gearbox is fixedly provided with the coded disc rotating wheel; the non-contact sensing groove disc is arranged on the gearbox; the control circuit comprises a 12-point Programmable Logic Controller (PLC) with eight input points and four output points; an internal resistor of an MOS tube is a currentsampling resistor; and transmission is performed in a digital way and the rotational speed of the motor is measured rapidly by an integrator principle. The programmable controller for the electric wheel chair switches the direction by using the MOS tube, and has no contact point, safety and reliability, long service life and high significant efficiency. The programmable controller for the electric wheel chair uses a back electromotive force to measure the rotational speed of the electric motor, so that the programmable controller for the electric wheel chair has advantages of high measuring speed, simple structure and maintenance-free property. The internal resistor of the MOS tube is used as the current sampling resistor, so that the programmable controller for the electric wheel chair avoids adding other sampling resistors, reduces heat emission and improves efficiency. Meanwhile, the transmission is performed in the digital way, so that a circuit is simple and correct.
Description
Technical field
The invention belongs to the electric wheelchair field.Relate to a kind of programmable controller for electric wheel chair, be particularly useful for controlling the control that two of electric wheel-chair vehicles have the brush DC generator speed.
Background technology
Along with China's economic liftoff development, the raising of living standards of the people, people have had new understanding to quality of life, and old people and action are had any problem the people with disability to going out accommodating and self-reliance has had new requirement, electric wheel-chair vehicle just is being suitable for above disadvantaged group and is using, require wheelchair to take the air line, two driving wheels need synchronous operation, and technical merit is had relatively high expectations, original controller uses the relay travel direction to switch, belong to switch with mechanical contact, the life-span is limited, and reliability is low.Former controller uses the photoelectric code disk encoder to carry out motor speed and detects, and advantage is to measure accurately, and shortcoming is a complex structure, the fault rate height, and measuring speed is slow.Former controller current detecting is used sample resistance, causes a part of reactive loss, former controller, and control crank, and use analog quantity to transmit between the driving box, complex circuit, and accuracy is low.
Summary of the invention
Problem to be solved by this invention is, overcome the deficiencies in the prior art, a kind of programmable controller for electric wheel chair is provided, adopt the metal-oxide-semiconductor travel direction to switch, use counter electromotive force to measure motor speed, and be current sampling resistor, use digital form to transmit simultaneously with the metal-oxide-semiconductor internal resistance, circuit is simple, and accurately.
The present invention solves its technical problem and takes following technical scheme to realize:
According to a kind of programmable controller for electric wheel chair provided by the invention, comprise joystick, code-disc runner, sensing groove dish and control circuit, described joystick is installed on the electric wheelchair, on power transmission shaft between motor and the gear-box, be fixed with a code-disc runner, noncontact form sensing groove dish is installed on the gear-box, control circuit comprises 12 Programmable Logic Controller PLC of 8 inputs, 4 outputs, and the metal-oxide-semiconductor internal resistance is a current sampling resistor.
The present invention compared with prior art has significant advantage and beneficial effect:
The present invention adopts the metal-oxide-semiconductor travel direction to switch, and contactless, safe and reliable, the life-span is long, and the obvious effective rate height uses counter electromotive force to measure motor speed, and advantage is that measuring speed is fast, and simple in structure, Maintenance free.Use the metal-oxide-semiconductor internal resistance as current sampling resistor, need not to add sample resistance, reduce heating, improved efficient.Use digital form to transmit simultaneously, circuit is simple, and accurately.Electric wheelchair controller adopts no pick off to measure motor speed fast.Utilize the integrator principle, measure motor speed fast.Utilize metal-oxide-semiconductor internal resistance measurement current data, transmit integrator, carry out the establishment information of software program, satisfy the requirement of the motion control program of product.Increase moment of torsion by designing on the basis that can be implemented in equal output, improve the electric wheel-chair vehicle grade climbing performance, ability in the hill-start can realize staying on 12 ° of gradients hill-start.
Because the present invention adopts no pick off fast measurement technique, but its line design and components and parts are selected all product attribute and technology index data for use, adopt reliable technique circuit and components and parts.Increase the reliability of product quality, enlarged the product structure innovation.Existing domestic, external electric wheel-chair vehicle is steamboat and directly drives, the restriction of its controlled system input power and output, thereby can only on the electric wheel-chair vehicle of steamboat footpath, use.After designing voluntarily, increased data variation in the control system, increase defencive function, electric wheel-chair vehicle can realize that bull wheel directly drives, because design has increased the anti-lock control loop voluntarily, alleviation product impulsive force makes product more humane, meets instructions for use.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the structural representation of electric wheelchair of the present invention.
Fig. 2 is control circuit figure of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to the specific embodiment provided by the invention, structure, feature and effect thereof, describe in detail as after.
As Fig. 1～2, a kind of programmable controller for electric wheel chair, comprise joystick, code-disc runner, sensing groove dish and control circuit, described joystick is installed on the electric wheelchair, on power transmission shaft between motor and the gear-box, be fixed with a code-disc runner, noncontact form sensing groove dish is installed on the gear-box, and control circuit comprises 12 Programmable Logic Controller PLC of 8 inputs, 4 outputs, and COM is the input common point; The S0 on and off switch; The S1 brake switch; S2 connects the acceleration rheostat; S3, the control of S4 direction; The right speed feedback of S5; The S6 benchmark is regulated; S7 left side speed feedback; The right Electric Machine Control of O0, O1; O2, O3 left side Electric Machine Control; R1, R2 feedback protection resistance, power supply is omitted.
Programmable controller, two of major control electric wheel-chair vehicles have the control of brush DC generator speed.Realization is divided into three parts: 1, measured motor rotating speed.2, utilize the PLC algorithm.3, PWM export technique
Measured motor speed all needs photoelectricity or electromagnetism encoder or tachometer generator to realize in the past.Present technique adopts the counter electromotive force method, measures motor speed.The brush direct current motor counter electromotive force is directly proportional with rotating speed, but motor terminal voltage comprises: E
Always=E
R+ E
F+ E
L, i.e. counter electromotive force resistance drop, inductance induced electromotive force.Resistance drop=E
R=I
0R knows that just I and R can try to achieve, and
So,
, and electric current I can be tried to achieve by the pressure drop of sampling resistor
The sampling resistor here is M
0The S internal resistance.Also has an issues of temperature compensation in addition.
u
2=f (Δ t+t) Δ t/ θ integrator can (20KHZ) be measured speed with PWM with frequently, and precision is: 1%.
Claims (1)
1. programmable controller for electric wheel chair, comprise joystick, code-disc runner, sensing groove dish and control circuit, it is characterized in that: described joystick is installed on the electric wheelchair, on power transmission shaft between motor and the gear-box, be fixed with a code-disc runner, noncontact form sensing groove dish is installed on the gear-box, control circuit comprises 12 Programmable Logic Controller PLC of 8 inputs, 4 outputs, and the metal-oxide-semiconductor internal resistance is a current sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810151311A CN101669856A (en) | 2008-09-12 | 2008-09-12 | Programmable controller for electric wheel chair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810151311A CN101669856A (en) | 2008-09-12 | 2008-09-12 | Programmable controller for electric wheel chair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101669856A true CN101669856A (en) | 2010-03-17 |
Family
ID=42017421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810151311A Pending CN101669856A (en) | 2008-09-12 | 2008-09-12 | Programmable controller for electric wheel chair |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101669856A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841764A (en) * | 2016-12-28 | 2017-06-13 | 东莞泰克威科技有限公司 | A kind of method by the use of the internal resistance of MOSFET pipes as output electric current measure |
-
2008
- 2008-09-12 CN CN200810151311A patent/CN101669856A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841764A (en) * | 2016-12-28 | 2017-06-13 | 东莞泰克威科技有限公司 | A kind of method by the use of the internal resistance of MOSFET pipes as output electric current measure |
| CN106841764B (en) * | 2016-12-28 | 2019-07-19 | 东莞泰克威科技有限公司 | A method of output electric current measure is realized using MOSFET pipe internal resistance |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100317 |