CN2645999Y - Electric power assisted diverter of automobile - Google Patents

Abstract

An electric power assisted diverter of automobile comprises a machinery transmission unit and an electric control unit. The utility model is characterized in that a steering shaft of the machinery transmission part is arranged in a shaft sleeve and formed by a direction column and a spline shaft by adopting the internal and external splines connection, and the joint is positioned by a nylon pin; a torsion sensor is arranged at one side of a worm-wheel shaft; a clutch of a motor clutch assembly controlled by the electric control unit is connected with a worm by a spline; the electric control unit comprises an input signal prepositive process circuit, a signal evaluation and process circuit and a control output circuit; the operating direction and torque size of motor are controlled by the control output circuit. The utility model only requires electric power without using hydraulic, so that the economy, the power performance and the mobility can be improved, the required torque at low speed or zero speed can be reduced, and the ''floating'' feeling of steering wheel for the driver during high-speed running can be reduced. The utility model can save energy about 80 percent, and improve the integral operating performance of automobile.

Description

Vehicle electric power-assisted steering device

Technical field

The utility model relates to automobile steering device, specifically is a kind of vehicle electric power-assisted steering device.

Technical background

Along with the fast development of modern automobile technology, people also improve day by day to the requirement of motor turning maneuvering performance.Require to guarantee that vehicle during steering wheel rotation, all has comparatively ideal road-holding property under any operating mode,, and when running at high speed, can not feel light shakiness even vehicle also can be free and relaxed during steering wheel rotation under the parking situation.Servo steering system just can satisfy this requirement of people.

Traditional automobile assisted power steering system is commonly referred to as hydraulic power-assist steering system, because hydraulic pressure needs oil pump, oil pipe, pressure flow control cock, petrol storage tank etc., number of parts is many, and it is big to take up room, and also exists the leak of liquid loss.The oil pump of hydraulic power-assist steering system is by engine drive, portability when guaranteeing that automobile pivot stud or low speed turn to, the discharge capacity of oil pump is that the flow during with engine idle is determined, and in the running car most of the time be in speed and the straight-line travelling state that is higher than idling, the fluid major part of oil pump output can only be back to petrol storage tank through control cock, cause very big " no load losses ".Some automobiles being arranged titled with electric power steering, is not pure electrically operated servo-steering truly in fact, and it also needs hydraulic efficiency pressure system, only by the electrical motor fuel feeding.

Summary of the invention

The purpose of this utility model just provides a kind of needs electric power without hydraulic pressure, economy, dynamic property and the manoevreability of automobile are all increased, required moment in the time of reducing low speed or zero-speed has reduced motorist's sensation that bearing circle " wafts " when running at high speed; Can be energy-conservation about 80%, improved the electric booster steering device of the overall operation performance of automobile.

Above-mentioned purpose of the present utility model is to realize by such technical scheme, it is a kind of vehicle electric power-assisted steering device, comprise mechanical drive and electronic control unit two parts, it is characterized in that: mechanical drive comprises steering shaft, worm-wheel shaft, motor-clutch assembly, transmission shaft, worm screw and worm gear, wherein steering shaft is connected with worm-wheel shaft one end spline, steering shaft is connected and composed by male splines in direction post and the castellated shaft employing in axle sleeve, uses the nylon finger setting in the junction; Worm-wheel shaft and worm gear interference fit, a side mounting torque sensor of worm-wheel shaft; Be connected with worm screw by spline by the power-transfer clutch of the electric motor clutch assembly of electronic control unit controls; The other end of worm-wheel shaft is connected with splined driveshaft; Electronic control unit comprises incoming signal preposing signal process circuit, signal judgement and treatment circuit and control output circuit; Wherein the incoming signal preposing signal process circuit carries out engine rotational speed signal, vehicle speed signal and torque signal to be connected with the input end of treatment circuit with the signal judgement by mouth after the pre-process; Signal is judged and the signal output part of treatment circuit is connected with power-transfer clutch and motor power control circuit in detection indicator lamp, the motor-clutch assembly by the digital signal amplification driving circuit respectively; By control the service direction and the moment size of motor behind moment initialization circuit and the service direction control circuit by H bridge driving circuit.

The utility model is owing to described structure has following advantage:

1.. the utility model is assembled into an integral body with each parts such as electrical motor, power-transfer clutch, speed reduction gearing, deflecting bars, this had not both had pipeline and had not had control cock yet, its compact conformation, quality are reduced, realized the small-sized light and handy of steering swivel system, saved the installing space of light-duty vehicle preciousness.And the quality of electric boosting steering system is than the light weight about 25% of hydraulic power-assist steering system.

2.. there is not the necessary normal running power steerig pump of hydraulic power-assist steering system, electrical motor just just starts when needed, so that consumption of power and fuel oil consumption all can drop to is minimum, and has saved oil hydraulic system, do not need needn't worry leakage of oil to the power steerig pump repairing yet.

3.. the utility model is by Single-chip Controlling, can obtain best power source through optimizing according to signals such as the speed of a motor vehicle, steering-wheel torque and engine speeds, can obviously improve the manipulation portability and the stability of automobile, and can be according to the needs of automotive performance and driving habit, by software correction dynamic characteristic.

4.. the utility model number of parts is few, and is simple in structure, and the lubricating oil of need not annotating.

5.. the utility model is the energy with the battery, with motor as dynamical element, so the electric boosting steering system energy needed under any circumstance can obtain, be not subjected to the influence of engine stoping operation, even when stopping, also can obtain maximum steering power, reduce the loss of driving engine, increase horsepower output.

6.. the utility model is more simple in structure than hydraulic power-assist steering system, and returnability is good, thereby has obtained optimum steering reversal characteristic, has improved stability greatly.

7.. " no load losses " of the utility model noenergy.

Therefore electric boosting steering system all can save energy about 80% under various driving conditions, has improved the overall operation performance of automobile.

Description of drawings

Said structure of the present utility model can further specify by the embodiment that accompanying drawing provides.

Accompanying drawing 1 is a mechanical construction drawing of the present utility model

Accompanying drawing 2 is electronic control unit circuit module figures of the present utility model;

Accompanying drawing 3 is that the A of accompanying drawing 1 is to scheme drawing.

1 is steering shaft among the figure, and 2 is support, and 3 is worm-wheel shaft, and 4 is electronic control unit, and 5 is motor-clutch assembly, and 6 is sensor, and 7 is transmission shaft, and 8 is worm screw, and 9 is worm gear

The specific embodiment

Referring to accompanying drawing 1, the moment that chaufeur is applied on the bearing circle passes to worm-wheel shaft 3 by steering shaft 1.The torque signals that sensor 6 detects worm-wheel shaft 3 is translated into electronic signal.After electronic control unit 4 receives the electric signal that sensor 6 sends, send control signal and give motor-clutch assembly 5 by analyzing, handling in conjunction with other signal.Electric motor clutch is converted into power-assist moment with electric signal, passes to worm-wheel shaft 3 by worm gear 9 worm screws 8.The moment that motor M produces and the application force of chaufeur form force action and on the male splines bonded assembly transmission shaft 7, produce the power-assisted effect in adopting with worm-wheel shaft 3.

Steering shaft 1 is connected and composed by male splines in direction post and the castellated shaft employing in axle sleeve in the said structure, uses the nylon finger setting in the junction; When strong head-on crash took place automobile, nylon pin 2 was cut off like this, and steering shaft 1 produces and shrinks, and absorbs collision energy, can prevent to move the injury chaufeur behind the bearing circle.

Transmission shaft 7 has adopted the contraction type structure in the said mechanism, when strong head-on crash occurring, can shrink automatically, but as long as bearing circle can rotate, entire mechanism part just can normal operation, has promptly strengthened the safety of chaufeur, can not influence the rotation of direction again behind bump.

Physical construction adopts the contraction type structure, be mainly reflected on the internal connection of steering shaft, protection safety measure compared to other type has advantage greatly itself, at first when automobile suffers strong head-on crash, its mechanism structure can be shunk automatically, prevent to move behind the bearing circle injury chaufeur and reach purpose of safety, secondly steering hardware still can normally use after the direction device contraction change.

Referring to accompanying drawing 2, electronic control unit of the present utility model comprises incoming signal preposing signal process circuit, signal judgement and treatment circuit and control output circuit.IGP is an engine rotational speed signal among the figure; RSW is the speed of operation signal; Tm is main torque signal; Ts is the accessory torque signal, and these four kinds of signals constitute the incoming signal part jointly.A1, A2, A3, A4 are the shaping of incoming signal pre-process, filter circuit, and wherein, A1 adopts capacitance-resistance filter and LM158 amplifying circuit, and A2 adopts TLP521 photoelectricity isolating amplifier circuit, and A3 and A4 adopt electric resistance partial pressure, capacitance-resistance filter and LM158 amplifying circuit; A5 is the security of system reactive circuit; A6 adopts TLE6228 digital signal amplification driving circuit; A7 is the logical interlock circuit that the control signal treatment circuit of motor operation, direction adopts 74LS00 and 74LS14; A8 is output of motor torque setting signal and treatment circuit, adopts capacitance-resistance filter and relatively amplifies chip TL494; A9 is the development interface circuit; A10 is the digital meter interface circuit; A11 is the control circuit of motor H bridge driving circuit, adopts the MC33883DW chip; A12 is the current feedback circuit of motor power circuit, adopts relatively amplifying circuit AD8200; The motor H bridge driving circuit that MOS1, MOS2, MOS3, MOS4 are made up of four MOSFET pipes is subjected to the drive controlling of A11; Whether Relay has power-assisted relay for control.Vcc1 supplies with microcontroller power supply 3.3V; Vcc2 is a driving power of removing microcontroller power supply all circuit in addition; + BB directly gives on the automobile+12V master's driving power.EPS Lamp is the EPS indicator lamp; Clutch is the power-transfer clutch on the electric booster steering device assist motor, and M is the electric booster steering device assist motor, and structurally Clutch and M have formed motor-clutch assembly (5) jointly.

Claims (2)

1, a kind of vehicle electric power-assisted steering device, comprise mechanical drive and electronic control unit two parts, it is characterized in that: mechanical drive comprises steering shaft (1), worm-wheel shaft (3), motor-clutch assembly (5), transmission shaft (7), worm screw (8) and worm gear (9), wherein steering shaft is connected with worm-wheel shaft one end spline, steering shaft is connected and composed by male splines in direction post and the castellated shaft employing in axle sleeve, locatees with nylon pin (2) in the junction; Worm-wheel shaft and worm gear interference fit, a side mounting torque sensor (6) of worm-wheel shaft; Be connected with worm screw by spline by the power-transfer clutch of the electric motor clutch assembly of electronic control unit (4) control; The other end of worm-wheel shaft is connected with splined driveshaft; Electronic control unit comprises incoming signal preposing signal process circuit, signal judgement and treatment circuit and control output circuit; Wherein the incoming signal preposing signal process circuit carries out engine rotational speed signal, vehicle speed signal and torque signal to be connected with the input end of treatment circuit with the signal judgement by mouth after the pre-process; Signal is judged and the signal output part of treatment circuit is connected with power-transfer clutch and motor power control circuit in detection indicator lamp, the motor-clutch assembly by the digital signal amplification driving circuit respectively; By control the service direction and the moment size of motor behind moment initialization circuit and the service direction control circuit by H bridge driving circuit.

2, vehicle electric power-assisted steering device according to claim 1 is characterized in that: transmission shaft (7) has adopted the contraction type structure.