CN105730227B - Electrical piston driving type electric vehicle suitable for down hill braking - Google Patents

Abstract

The present invention relates to a kind of electrical piston driving type electric vehicle suitable for down hill braking, it includes：Electric power piston motor, the flywheel on the bent axle being connected in electric power piston motor, the clutch on flywheel, the gearbox being connected with the output shaft of clutch, the vehicle drive system with the output shaft drive connection of gearbox；The gear ring of flywheel outer rim engages with the drive gear of activation system；Motor includes：Multiple cylinder bodies, the piston made of permanent magnet in cylinder body and the connecting rod for each piston to be connected with transmission of crankshaft；Bent axle is located at the lower section of each cylinder body；The upper end of cylinder body is provided with the electromagnet with cylinder body coaxial inner conductor, and magnet spool is connected with coil driver；Coil driver is connected with CPU element；Electromagnet is on switching mechanism；The upper and lower travel switch being connected with CPU element is respectively equipped with the upper and lower stop of neighbouring cylinder body, the bottom of cylinder body is provided with the Hall sensor being connected with CPU element.

Description

Electrical piston driving type electric vehicle suitable for down hill braking

The application is divisional application, the Application No. 201110027288.8 of original application, and the applying date is：January 25 in 2011 Day, invention and created name：Electrical piston driving type electric vehicle suitable for down hill braking.

Technical field

The present invention relates to the technical field of the electric car of electric power piston motor driving, is specifically that one kind is suitable to down hill braking Electrical piston driving type electric vehicle.

Background technology

Chinese patent literature CN101860168A discloses a kind of electric motor, its conventional engines supplies, fuel feeding, Exhaust, ignition system remove, and are substituted with electromagnet assembly, internal piston insertion permanent magnet, then by controlling electromagnetism iron wire The sense of current of circle controls piston upper and lower displacement in cylinder, and piston through connecting rod crank mechanism externally exports power.The electric power is sent out Motivation is applied to the vehicles such as automobile, motorcycle.

The patent document of similar above-mentioned technical proposal, also CN1996724A, CN1255767A, CN200990555Y etc..

Above-mentioned electric power piston-type motor of the prior art is disadvantageous in that：Electromagnet is flowed through by frequent switching The sense of current of coil changes the magnetic polarity of electromagnet, so as to control the direction of the active force of electromagnet and piston, and then controls The shift reciprocately of piston processed；But in actual implementation process, because the sense of current of electromagnet coil can not instantaneously change, cause The power output of motor or the stability of moment of torsion can not be ensured.Therefore, electromagnet coil is flowed through using switching The sense of current changes the magnetic polarity of electromagnet, so as to control the technical scheme of the direction of displacement of piston, without practicality.

In order to solve the above technical problems, Chinese patent literature CN101697445A discloses a kind of motor, it uses one To magnet exciting coil alternating conductive setting up and down, so that piston reciprocating displacement.But in actual implementation process, due to magnet exciting coil Electric current can not instantaneously change, and up and down magnet exciting coil exist in mutual crosstalk and magnetic and etc. reason, the program also can not be true Protect the power output of motor or the stability of moment of torsion.

The power output of electric power piston-type motor or the stability of moment of torsion are how improved, is that this area will solve Technical problem certainly.

In addition, existing petrol and diesel oil motor vehicle is repacked into and adopted frequently with motor direct-drive wheel by existing electric car With the electric car of motor direct-drive, cost is higher, tedious process and is not easy to realize.How by existing petrol and diesel oil motor vehicle Gasoline and diesel engine directly change electrodynamic type into, and utilize the direct drive such as the flywheel in original motor vehicle, clutch, gearbox The transmission system of motor vehicle, it is this area technical problems to be solved.

The content of the invention

The technical problem to be solved in the present invention is to provide a kind of electrical piston driving type simple in construction, suitable for down hill braking Electric car.

In order to solve the above-mentioned technical problem, the invention provides a kind of electrical piston driving type suitable for down hill braking is electronic Car, it includes：Electric power piston motor, the flywheel on the bent axle being connected in electric power piston motor, on flywheel from Clutch, the gearbox being connected with the output shaft of clutch, the vehicle drive system with the output shaft drive connection of gearbox；Flywheel The gear ring of outer rim engages with the drive gear of an activation system；The electric power piston motor includes：Multiple cylinder bodies, located at cylinder body The interior piston made of permanent magnet and the connecting rod for each piston to be connected with the transmission of crankshaft；Bent axle is located at each cylinder body Lower section；The upper end of the cylinder body is provided with the electromagnet with cylinder body coaxial inner conductor, magnet spool and a coil driver phase Even；The coil driver is connected with a CPU element；The electromagnet is located on the switching mechanism by CPU element control；It is adjacent Be respectively equipped with the upper and lower travel switch being connected with CPU element at the upper and lower stop of nearly cylinder body, the bottom of cylinder body provided with it is described The connected Hall sensor of CPU element；CPU element is also associated with vehicle Slope Transducer, for detecting speed governing pedal or hand handle The speed governing sensor of position.

When electric car starts, the flywheel is driven using the activation system and makes the crank rotation, the CPU element The direction of displacement of each piston is detected by the Hall sensor of each cylinder base；If the piston measured in a cylinder body is positive the next Move, then the CPU element provides respective direction by the coil driver to the magnet spool above the cylinder body Electric current, so that the magnetic polarity of the electromagnet bottom is identical with the magnetic polarity of top land, piston is because of the lower repulsion from electromagnet And accelerate to move down in the cylinder body；If measuring the piston forward direction top offset in a cylinder body, the CPU element passes through the coil Drive circuit provides the electric current of respective direction to the magnet spool above the cylinder body, so that the magnetic polarity of the electromagnet bottom Magnetic polarity with top land is on the contrary, piston accelerates to move up because of the upper suction from electromagnet in the cylinder body；Treat each electromagnetism The coil of iron obtain it is electric after, disconnect the activation system and keep the sense of current in each coil constant；Meanwhile when the CPU is mono- When the piston that member is measured by the lower stroke switch in a cylinder body will reach the lower dead center of the cylinder body, CPU element passes through institute Stating switching mechanism controls the electromagnet above the cylinder body to rotate 180 ° around the height center line of the electromagnet, and piston now is Lower dead center is reached, due to the magnetic polarity of electromagnet bottom now and the magnetic polarity of top land on the contrary, piston is because coming from electromagnetism The upper suction of iron and start to shift up in the cylinder body；When the CPU element measures a cylinder body by the upper stroke switch When interior piston will reach the top dead centre of the cylinder body, CPU element controls the electromagnetism above the cylinder body by the switching mechanism Iron reversely rotates 180 ° around the height center line of the electromagnet, and piston now has reached top dead centre, due to electromagnetism now The magnetic polarity of iron bottom is identical with the magnetic polarity of top land, and piston starts to bottom offset because of the lower repulsion from electromagnet； So repeatedly, so that each piston drives the crankshaft operation through corresponding connecting rod and drives the flywheel to export positive-torque, fly Wheel drives vehicle drive system by clutch, gearbox, so as to drive electric car；Meanwhile CPU element passes through speed governing sensor The position of speed governing pedal or hand handle is detected, and then controls the size of current of each coil, so as to realize speed control；Measuring speed governing When pedal or hand handle have been released, CPU element controls the coil driver to stop to each coil power supply.

When CPU element is measured by the vehicle Slope Transducer, Current vehicle is on gug and the gradient is more than abrupt slope Value, while measure speed governing pedal or when hand handle has been released, CPU element starts motor brake program, i.e.,：CPU element passes through The Hall sensor detects the direction of displacement of each piston, if measuring a piston forward direction bottom offset, CPU element passes through the line The electric current that drive circuit provides respective direction to corresponding coil is enclosed, so that the magnetic polarity and piston top of corresponding electromagnet bottom The magnetic polarity in portion with reduce piston on the contrary, move down speed, so as to brake the bent axle；If measuring a piston forward direction top offset, Then CPU element provides the electric current of respective direction by the coil driver to corresponding coil, so that corresponding electromagnet The magnetic polarity of bottom is identical with the magnetic polarity of top land, speed is moved up with reduce piston, so as to brake the bent axle；Institute When stating bent axle and not shutting down, if CPU element by the lower stroke switch measure the piston will reach the cylinder body it is lower only Point, then CPU element control electromagnet above the cylinder body to be rotated around the height center line of the electromagnet by the switching mechanism 180 °, if piston now has reached lower dead center and has started to shift up, magnetic polarity and work due to electromagnet bottom now Magnetic polarity at the top of filling in is identical, and piston bears the lower repulsion from electromagnet while starting to shift up and brakes the song Axle；If CPU element measures the piston by the upper stroke switch will reach the top dead centre of the cylinder body, CPU element passes through The switching mechanism controls the electromagnet above the cylinder body to reversely rotate 180 ° around the height center line of the electromagnet, if now Piston has reached top dead centre and started to bottom offset, due to the magnetic polarity of electromagnet bottom and the magnetic polarity of top land now On the contrary, piston brakes the bent axle because of the upper suction from electromagnet；So repeatedly, so that the flywheel externally exports negative twist Square, until when the rotating speed of the flywheel is less than a low speed value, stop to each coil power supply；Or, until CPU element measures speed governing and stepped on When plate is operated or hand handle is rotated, CPU element controls the flywheel output positive-torque again.

The above-mentioned technical proposal of the present invention has advantages below compared with prior art：（1）The electric power piston type electricity of the present invention In the course of the work, the magnet spool sense of current remains constant to motivation；When piston will reach upper and lower stop, Electromagnet is controlled around quickly 180 ° of the rotation of its height center line, to be switched fast the magnetic polarity of electromagnet upper and lower side, so that electric Magnet produces positive acting power to piston repeatedly, and then drives bent axle and flywheel is externally exported positive-torque.What the present invention used Such scheme, avoids the delay brought because coil current can not realize instantaneous reverse of prior art, and then makes the present invention Motor power output or moment of torsion there is preferable stability, practicality is preferable.（2）The motor of the present invention On startup, the flywheel turns are made using activation system, CPU element detects each piston by the Hall sensor in each cylinder body Direction of displacement, with the direction of displacement according to each piston by coil driver to each coil provide respective direction electric current, To realize that each piston drives bent axle to continuously run by corresponding connecting rod, activation system is then turned off, it is achieved thereby that of the invention Motor reliable startup.（3）When, it is necessary to when flywheel externally exports negative torque, first stopping to each line in flywheel operation process Circle is powered, and then CPU element detects the direction of displacement of each piston by the Hall sensor in each cylinder body, and according to each piston Direction of displacement provides the electric current of respective direction to each coil by coil driver and keeps the sense of current constant, then basis The position of each piston, electromagnet upper and lower side is switched fast by way of its height center line quickly 180 ° of rotation electromagnet Magnetic polarity, so that electromagnet produces damping force to each piston repeatedly, and then brake bent axle and the flywheel is externally exported and bear Moment of torsion simultaneously is implemented to brake.The motor of the present invention is implemented to brake automatically when abrupt slope is descending, it is ensured that driving safety.（4）This Hall sensor in invention is located at the bottom center of cylinder body, and relative with the bottom surface center of the piston.Due to the two of piston Similarly hereinafter lineal layout, therefore the electromagnetic signal that Hall sensor obtains comes from work substantially on two magnetic poles of individual magnetic pole and electromagnet Bottom is filled in, i.e. Hall sensor is not disturbed by electromagnet substantially, it is ensured that the reliability of piston position detection.Specific implementation When, it can also use electromagnetic compensation and/or shielding except the shielding measure of the electromagnetic signal of vertical direction, it is defeated to improve Hall sensor Go out the reliability of signal.（5）In the present invention, each piston is symmetrically distributed in the height center line two of cylinder body in corresponding cylinder body Side, to ensure that each piston effect has preferable uniformity and stability with the active force on bent axle.（6）The electric car of the present invention It is primarily referred to as electric automobile or battery-operated motor cycle, electro-tricycle, electric agricultural mechanical car etc..

Brief description of the drawings

（0013）In order that present disclosure is more likely to be clearly understood, below according to specific embodiment and combination Accompanying drawing, the present invention is further detailed explanation, wherein

Fig. 1 is the structural representation of the electric power piston-type motor in embodiment；

Fig. 2 is that one kind that the electric power piston-type motor in embodiment uses is used to control electromagnet around its height center line The switching mechanism of 180 ° of rotation and the structural representation of cylinder body；

Fig. 3 is the circuit block diagram of the control circuit of the electric power piston-type motor；

Fig. 4 is the power train structural map of the electrical piston driving type electric vehicle in embodiment;

Fig. 5 is that the structure of another switching mechanism and cylinder body that the electric power piston-type motor in embodiment uses is shown It is intended to.

Embodiment

See Fig. 1-3, the electrical piston driving type electric vehicle suitable for down hill braking of the present embodiment, it includes：Brakes, Electric power piston motor 20, the flywheel on the bent axle being connected in electric power piston motor 20, the clutch 21 on flywheel, Gearbox 22, the vehicle drive system with the output shaft drive connection of gearbox 22 being connected with the output shaft of clutch 21；Fly The gear ring of wheel outer rim engages with the drive gear of an activation system.The activation system is using of the prior art and existing gasoline The matching used activation system of engine.

The vehicle drive system includes：The drive shaft 24 of output shaft drive connection through universal joint 23 and gearbox 22, The differential mechanism 27 being connected through another universal joint with drive shaft 24 and the car being connected with differential mechanism 27 by the transmission of semiaxis 26 Wheel.Wherein, main reducing gear 25 can be set in drive shaft 24 and differential mechanism 27.

The electric power piston motor 20 includes：Multiple high resistance non-magnet materials（Such as：Aluminium alloy, copper alloy etc.）It is made Cylinder body 1, the piston made of permanent magnet 5 in cylinder body 1, the bent axle 2 located at the lower section of each cylinder body 1 and for by each piston 5 connecting rods 3 being connected with the bent axle 2；The upper end of the cylinder body 1 is provided with the electromagnet 7 with the coaxial inner conductor of cylinder body 1, electromagnetism The coil 8 of iron 7 is connected with a coil driver；The height center line of electromagnet 7 is provided with rotating shaft 9, and the rotating shaft 9 passes through a pair Bearing block 4 is located at the top of cylinder body 1；The gearbox 11 of one end one of rotating shaft 9 is connected with a stepper motor 12 transmission；The coil drives Dynamic circuit and stepper motor 12 are connected with a CPU element；It is respectively equipped with the upper and lower stop of neighbouring cylinder body 1 and is connected with CPU element Upper and lower travel switch 13 and 14；The bottom center of the cylinder body 1 is provided with a Hall sensor being connected with the CPU element 15.The Hall sensor 15 is relative with the bottom surface center of the piston 5.Hall sensor 15 is located at the gold of a non-magnet material Belong in pipe, the metal tube and the coaxial inner conductor of piston 5.Come substantially with the electromagnetic signal for further obtaining Hall sensor 15 From the bottom of piston.CPU element is also associated with vehicle Slope Transducer, the speed governing for detecting speed governing pedal or handlebar position passes Sensor.

（0017）The brakes includes：Brake pedal, by brake pedal be driven control brake and with the CPU The brake pedal sensor for being used to detect brake pedal position that unit is connected；The upper and lower travel switch 13 and 14 is used and connect Touch or infrared-type travel switch.The piston 5 of cylindricality is provided with wear-resisting ring.

Each piston 5 is in different travel positions in the cylinder body 1, and each piston 5 symmetrically divides in corresponding cylinder body 1 The height center line both sides of cylinder body 1 are distributed in, to ensure that connecting rod 3 is suitable to continuous driving crank 2, and the moment of torsion for exporting bent axle 2 is steady It is fixed.

When electric car starts, the flywheel is driven using the activation system, so that the bent axle 2 rotates, the CPU is mono- Member detects the direction of displacement of each piston 5 by the Hall sensor 15 of each bottom of cylinder body 1；Now, if measuring the work in a cylinder body 1 5 positive bottom offsets are filled in, then coil 8 of the CPU element by the coil driver to the electromagnet 7 of the top of cylinder body 1 The electric current of respective direction is provided, so that the magnetic polarity of the bottom of electromagnet 7 is identical with the magnetic polarity at the top of piston 5, piston 5 is because coming Accelerate to move down in the cylinder body 1 from the lower repulsion of electromagnet 7；Or, if the piston 5 now measured in a cylinder body 1 is positive upper Move, then the CPU element provides respective direction by the coil 8 of the coil driver to the electromagnet 7 of the top of cylinder body 1 Electric current so that the magnetic polarity at the top of the magnetic polarity of the bottom of electromagnet 7 and piston 5 on the contrary, piston 5 because from electromagnet 7 Upper suction and accelerate in the cylinder body 1 to move up；After each electromagnet 7 coil 8 it is electric after, disconnect the activation system and keep each The sense of current in coil 8 is constant；Meanwhile the work in a cylinder body 1 is measured by the lower stroke switch 14 when the CPU element When plug 5 will reach the lower dead center of the cylinder body 1, CPU element exports a pulse signal to the stepper motor 12, should with driving Stepper motor 12 rotates a fixed angle by the direction of setting, so that stepper motor 12 controls institute through the gearbox 11 State rotating shaft 9 and rotate 180 °, and piston 5 now just or has reached lower dead center, due to the magnetic polarity of the bottom of electromagnet 7 now With the magnetic polarity at the top of piston 5 on the contrary, piston 5 the upper suction from electromagnet 7 because starting to shift up in the cylinder body 1； When the CPU element measures the piston 5 by the upper stroke switch 13 will reach the top dead centre of the cylinder body 1, CPU element Another pulse signal is exported to the stepper motor 12, to drive the opposite direction of stepper motor 12 to rotate a fixed angle, So that stepper motor 12 controls the rotating shaft 9 to reversely rotate 180 ° through the gearbox 11, and piston 5 now is just or Top dead centre is reached, and piston 5 starts to bottom offset because of lower repulsion；So repeatedly, so that each piston 5 is through corresponding connecting rod 3 The bent axle 2 is driven to operate to drive the flywheel output positive-torque, flywheel drives vehicle to pass by clutch 21, gearbox 22 Dynamic system, so as to drive electric car.

When the speed governing pedal of non-releasing orientation or the constant position of hand handle, the CPU element passes through Hall sensor The position of the 15 detection pistons 5, to draw the spacing of the piston 5 and electromagnet 7 in same cylinder body 1, and according to this The size of current in the coil 8 is adjusted by the coil driver in real time away from size, so that the piston 5 is upper and lower In displacement process, keep the size of active force between piston 5 and electromagnet 7 stable so that the power of this motor output or The stability of moment of torsion is preferable.When changing in the position of the speed governing pedal or hand handle, the CPU element also same cylinder The spacing of the piston 5 and electromagnet 7 in body 1 adjusts the size of current in each coil 8 in real time, so that piston 5 and electromagnet 7 Between active force change it is linear and corresponding with the change in location of the speed governing pedal or hand handle, and then make the speed be in Linear change, to pass through driver comfort.

The speed governing pedal of this electric car（It uses the gas pedal of automobile of the prior art）Or hand handle（It uses existing The speed regulating handle of electric bicycle in technology）The speed governing sensor being connected with the CPU element is provided with, CPU element passes through Speed governing sensor detects the position of speed governing pedal or hand handle, and then controls the size of current of each coil 8, so as to realize speed control System.Pressure sensor is can be selected in speed governing sensor, and corresponding pressure value signal is exported according to the depth that speed governing pedal is entered into.

The CPU element is also associated with the vehicle Slope Transducer for detecting vehicle chassis angle（China can be used specially Vehicle slope sensor disclosed in sharp document CN2703248）；When this electric car it is forward when, if pass through the vehicle gradient pass Sensor measures Current vehicle and climbed upwards, and the position for measuring speed governing pedal or hand handle is constant, then CPU element is big according to the gradient The small automatic electric current for accordingly heightening each coil 8, so that speed is stable.If Current vehicle is measured by the vehicle Slope Transducer The position come down downwards and measure speed governing pedal or hand handle is constant, then CPU element is accordingly turned down respectively automatically according to gradient size The electric current of coil 8, so that speed is stable.

（0023）It is more than when CPU element by the vehicle Slope Transducer measures Current vehicle and is in gug upgrade Abrupt slope is worth（It is greater than 10 °）, while measure speed governing pedal or when hand handle has been released, no matter whether brake pedal is operated, CPU element starts motor brake program, i.e.,：

CPU element detects the direction of displacement of each piston 5 by the Hall sensor 15, if measuring a piston 5 downward Displacement, then CPU element by the coil driver to corresponding coil 8 provide respective direction electric current so that accordingly The magnetic polarity at the magnetic polarity of the bottom of electromagnet 7 and the top of piston 5 is described so as to brake on the contrary, move down speed with reduce piston 5 Bent axle 2, i.e.,：The flywheel is set externally to export negative torque；If measuring 5 positive top offset of a piston, CPU element passes through the line The electric current that drive circuit provides respective direction to corresponding coil 8 is enclosed, so that the magnetic polarity and piston of the corresponding bottom of electromagnet 7 The magnetic polarity at 5 tops is identical, speed is moved up with reduce piston 5, so as to brake the bent axle 2.

When the bent axle 2 does not shut down, if CPU element the piston 5 is measured by the lower stroke switch 14 will The lower dead center of the cylinder body 1 is reached, then CPU element exports a pulse signal to the stepper motor 12, to drive the stepping electric Machine 12 rotates a fixed angle by the direction of setting, so that stepper motor 12 controls the rotating shaft through the gearbox 11 9 180 ° of rotations, if piston 5 now is lucky or has reached lower dead center and has started to shift up, due to the bottom of electromagnet 7 now The magnetic polarity in portion is identical with the magnetic polarity at the top of piston 5, and piston 5 is born while starting to shift up from electromagnet 7 Lower repulsion and brake the bent axle 2；If CPU element measures the piston 5 by the upper stroke switch 13 will reach the cylinder body 1 Top dead centre, then CPU element export another pulse signal to the stepper motor 12, to drive the stepper motor 12 to rotate backward One fixed angle, so that stepper motor 12 controls the rotating shaft 9 to reversely rotate 180 ° through the gearbox 11, if now Piston 5 just or reached top dead centre and started to bottom offset, then due to the magnetic polarity and piston of the bottom of electromagnet 7 now 5 top magnetic polarity on the contrary, piston 5 because braking the bent axle 2 the upper suction from electromagnet 7；So repeatedly, so that described Flywheel externally exports negative torque, until speed is brought down below a low speed value（Such as 15Km/h）When, stop powering to each coil 8；Or, Depressed again or when hand handle is rotated until CPU element measures speed governing pedal by speed governing sensor, now CPU element is again The flywheel is controlled normally to export positive-torque.

The CPU element detects the rate of displacement of each piston 5 to judge whether the bent axle 2 stops by Hall sensor 15 Only operate.

When externally exporting braking torque by the bent axle 2, electricity that the coil driver provides to the coil 8 Flow for pulse current.The side of coil 8 is provided with air cooling equipment or the coil 8 is located in oil cooling device；Pulse in coil 8 The dutycycle of electric current and the temperature of the coil 8 are linearly or nonlinearly negative correlation, to prevent coil 8 from overheating.

During electric car traveling, if CPU element measures speed by vehicle speed sensor is less than 30Km/h, and speed governing is stepped on When plate or hand handle have been released, then CPU element startup idling slides program.I.e. CPU element controls size of current in each coil 8, So that speed is stable at 20Km/h.

The brakes of this electric car uses the brakes of the vehicles equipped with gasoline engine of prior art.

When speed is higher, such as larger than 40Km/h, CPU element measures brake pedal by brake pedal sensor and is operated, When i.e. brakes implements braking, CPU element also starts motor brake program, until when the bent axle 2 will shut down, Stop powering to each coil 8；Or, until CPU element measures brake pedal by brake pedal sensor and is released, i.e. braking system When system stops implementing braking, stop powering to each coil 8.

Fig. 5 is the structural representation of another switching mechanism, and electromagnet 7 is in a little gear 16, and the small tooth The central shaft of wheel 16 is on the central point of electromagnet 7, and the little gear 16 is meshed with a gear wheel 17, the gear wheel 17 and institute The transmission of gearbox 11 is stated to be connected；During work, CPU element exports a pulse signal to the stepper motor 12, to drive the step Stepper motor 12 rotates a fixed angle by the direction of setting, so that stepper motor 12 is through the gearbox 11, gear wheel 17 control 180 ° clockwise or counterclockwise of the little gears 16.

Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and is not to the present invention The restriction of embodiment.For those of ordinary skill in the field, it can also be made on the basis of the above description Its various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair Among the obvious changes or variations that bright spirit is extended out is still in protection scope of the present invention.

Claims (1)

1. A kind of 1. electrical piston driving type electric vehicle suitable for down hill braking, it is characterised in that including：Electric power piston motor （20）, be connected to electric power piston motor（20）In bent axle on flywheel, the clutch on flywheel（21）With clutch （21）The connected gearbox of output shaft（22）With gearbox（22）Output shaft drive connection vehicle drive system；It is described The gear ring of flywheel outer rim engages with the drive gear of an activation system；

   The electric power piston motor（20）Including：Cylinder body made of multiple high resistance non-magnet materials（1）, located at cylinder body（1） The interior piston made of permanent magnet（5）With for by each piston（5）With the bent axle（2）The connecting rod of drive connection（3）；Bent axle （2）Located at each cylinder body（1）Lower section；

   The cylinder body（1）Upper end be provided with and cylinder body（1）The electromagnet of coaxial inner conductor（7）, electromagnet（7）Coil（8）With one Coil driver is connected, and the coil driver is connected with a CPU element；The electromagnet（7）Controlled located at by CPU element Switching mechanism on；

   Neighbouring cylinder body（1）Upper and lower stop at be respectively equipped with the upper and lower travel switch being connected with CPU element（13、14）, cylinder body （1）Bottom be provided with the Hall sensor that is connected with the CPU element（15）；CPU element be also associated with vehicle Slope Transducer, For detecting the speed governing sensor of speed governing pedal or handlebar position；

   When electric car starts, the flywheel is driven using the activation system and makes the bent axle（2）Rotate, the CPU element Pass through each cylinder body（1）The Hall sensor of bottom（15）Detect each piston（5）Direction of displacement；

   If measure a cylinder body（1）Interior piston（5）Positive bottom offset, then the CPU element by the coil driver to The cylinder body（1）The electromagnet of top（7）Coil（8）The electric current of respective direction is provided, so that the electromagnet（7）The magnetic pole of bottom Property and piston（5）The magnetic polarity at top is identical, piston（5）Because coming from electromagnet（7）Lower repulsion and in the cylinder body（1）Interior acceleration Move down；

   If measure a cylinder body（1）Interior piston（5）Positive top offset, then the CPU element by the coil driver to The cylinder body（1）The electromagnet of top（7）Coil（8）The electric current of respective direction is provided, so that the electromagnet（7）The magnetic pole of bottom Property and piston（5）The magnetic polarity at top is on the contrary, piston（5）Because coming from electromagnet（7）Upper suction and in the cylinder body（1）Interior acceleration Move up；

   Treat each electromagnet（7）Coil（8）It is electric after, disconnect the activation system and keep each coil（8）In the sense of current It is constant；

   Meanwhile when the CPU element passes through the lower stroke switch（14）Measure a cylinder body（1）Interior piston（5）It will reach The cylinder body（1）Lower dead center when, CPU element controls the cylinder body by the switching mechanism（1）The electromagnet of top（7）Around the electricity Magnet（7）Height center line rotate 180 °, and piston now（5）Lower dead center is reached, due to electromagnet now（7）Bottom The magnetic polarity and piston in portion（5）The magnetic polarity at top is on the contrary, piston（5）Because coming from electromagnet（7）Upper suction and start at this Cylinder body（1）Inside shift up；When the CPU element passes through the upper stroke switch（13）Measure a cylinder body（1）Interior piston（5） The cylinder body will be reached（1）Top dead centre when, CPU element controls the cylinder body by the switching mechanism（1）The electromagnet of top （7）Around the electromagnet（7）Height center line reversely rotate 180 °, and piston now（5）Top dead centre is reached, due to now Electromagnet（7）The magnetic polarity and piston of bottom（5）The magnetic polarity at top is identical, piston（5）Because coming from electromagnet（7）Lower reprimand Power and start to bottom offset；So repeatedly, so that each piston（5）Through corresponding connecting rod（3）Drive the bent axle（2）Operating is simultaneously The flywheel output positive-torque is driven, flywheel passes through clutch（21）, gearbox（22）Vehicle drive system is driven, so as to drive Electric car；

   Meanwhile CPU element detects the position of speed governing pedal or hand handle by speed governing sensor, and then control each coil（8）Electricity Size is flowed, so as to realize speed control；When measuring speed governing pedal or hand handle has been released, CPU element controls the coil to drive Dynamic circuit stops to each coil（8）Power supply；

   When CPU element is measured by the vehicle Slope Transducer, Current vehicle is on gug and the gradient is more than abrupt slope value, Measure speed governing pedal simultaneously or when hand handle has been released, CPU element starts motor brake program, i.e.,：

   CPU element passes through the Hall sensor（15）Detect each piston（5）Direction of displacement, if measuring a piston（5）It is positive Bottom offset, then CPU element by the coil driver to corresponding coil（8）The electric current of respective direction is provided, so that phase The electromagnet answered（7）The magnetic polarity and piston of bottom（5）The magnetic polarity at top is on the contrary, to reduce piston（5）Move down speed, from And brake the bent axle（2）；If measure a piston（5）Positive top offset, then CPU element by the coil driver to right The coil answered（8）The electric current of respective direction is provided, so that corresponding electromagnet（7）The magnetic polarity and piston of bottom（5）Top Magnetic polarity is identical, to reduce piston（5）Move up speed, so as to brake the bent axle（2）；

   In the bent axle（2）When not shutting down, if CPU element passes through the lower stroke switch（14）Measure the piston（5）I.e. The cylinder body will be reached（1）Lower dead center, then CPU element the cylinder body is controlled by the switching mechanism（1）The electromagnet of top（7） Around the electromagnet（7）Height center line rotate 180 °, if piston now（5）Reach lower dead center and started to shift up, Due to electromagnet now（7）The magnetic polarity and piston of bottom（5）The magnetic polarity at top is identical, piston（5）Starting to upper Bear to come from electromagnet while shifting（7）Lower repulsion and brake the bent axle（2）；If CPU element is opened by the up stroke Close（13）Measure the piston（5）The cylinder body will be reached（1）Top dead centre, then CPU element by the switching mechanism control should Cylinder body（1）The electromagnet of top（7）Around the electromagnet（7）Height center line reversely rotate 180 °, if piston now（5） Reach top dead centre and start to bottom offset, due to electromagnet now（7）The magnetic polarity and piston of bottom（5）The magnetic polarity at top On the contrary, piston（5）Because coming from electromagnet（7）Upper suction and brake the bent axle（2）；So repeatedly, so that the flywheel pair Outer output negative torque, until when the rotating speed of the flywheel is less than a low speed value, stop to each coil（8）Power supply；Or, until CPU Unit measures speed governing pedal and is operated or when hand handle is rotated, and CPU element controls the flywheel output positive-torque again；

   The Hall sensor（15）Located at cylinder body（1）Bottom center, and with the piston（5）Bottom surface center it is relative；

   The Hall sensor（15）In the metal tube of a non-magnet material, the metal tube and the piston（5）It is concentric Line.