CN1294295A

CN1294295A - Work-measuring machine for non-load car chassis

Info

Publication number: CN1294295A
Application number: CN 99123032
Authority: CN
Inventors: 袁江; 袁永军
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-29
Filing date: 1999-10-29
Publication date: 2001-05-09
Anticipated expiration: 2019-10-29
Also published as: CN1188684C

Abstract

A work-measuring machine for non-load car chassis is composed of two coaxial drive rollers, two driven rollers, car lifting mechanism, speed sensor and computer. Said drive rollers are linked via clutch with constant-torsion power machine. The functions of its software include acquiring rotation speed pulse signal of wheel under constant-torsion action by computer, finding out angle acceleration and rotation inertia, separating from said power machine, accelerating by engina, and measuring the maximal power and rotation speed of car. Its advantages are high correctness, speed and safety.

Description

Work-measuring machine for non-load car chassis

The present invention relates to the vehicle detection technical field.

At present, road simulation dynamometer has all been adopted and has been carried test both at home and abroad, mainly make the output power that load absorbs the chassis with the air-cooled electric vortex flow machine of import, the exciting current that passes through the electric vortex flow machine of control during measurement of power is with control load, realize the running under the setting speed, N=M ω just knows the output power under this rotating speed like this.Automobile chassis output speed characteristic is quafric curve basically, to find out maximum power point (mpp) must (to have five points at least through multiple spot (friction speed) test, and power drop point must be arranged) could calculate out, because the output power (20-150KW) on chassis all changes into heat in electric vortex flow machine, the cooling of the electric vortex flow machine of therefore necessary fully assurance.Because of test point is many, and the fully cooling of the electric vortex flow machine of wait, its test speed is inevitable very slow.But and this equipment all be placed in must continuous detecting detection line on (the indispensable equipment of A level line), it is impossible finishing multi-point sampler, only its data of pinpoint test (as being fixed on 40Km/h) can not illustrate any problem, never are the problems that can revise solution with a coefficient.Test data is inaccurate, and equipment cost is higher.

The purpose of this invention is to provide a kind of work-measuring machine for non-load car chassis, its test speed is fast, can realize continuous detecting, test safety, and data are more accurate, and cost is low.

The present invention is achieved in that a kind of work-measuring machine for non-load car chassis, comprise coaxial two drive rolls and two driven cylinders, vehicle hoisting mechanism, speed pickup and computing machines, drive roll is turned round the active engine by a clutch coupling and a perseverance and is linked to each other, and scm software has following structure and characteristics:

A, ask moment of inertia software program characteristic as follows:

In that permanent torque forces is anti-when dragging automobile to quicken, the wheel speed of automobile will constantly increase, computing machine is constantly gathered the pulse signal of cylinder rotation, whether the speed of seeing cylinder reaches a certain rotating speed, for example: and 1000 rev/mins, as reach, time pulse of continuous acquisition then, so that try to achieve angular acceleration β, moment of inertia can be obtained by J=M/ β so, exports display screen to and gets final product;

B, ask the software program feature of the Maximum Power Output and the corresponding speed of a motor vehicle as follows:

In removing the motor car engine Dynamometry by Acceleration process of permanent torque forces clutch coupling, the wheel speed of automobile will constantly increase, the continuous acquisition pulse signal of computing machine, whether the speed of seeing cylinder reaches a certain setting speed, as reach, two time pulses of continuous acquisition then, so that try to achieve the intermittent angle acceleration β of this speed bottom roll, power under this speed can be drawn by N=J ω β/1000 so, like this, computing machine is constantly obtained speed again for greater than the cylinder angular acceleration of a plurality of speed points of setting speed and calculate power under the corresponding speed, exports its peak power at last and the corresponding speed of a motor vehicle gets final product.

The desirable 30Km/h of minimum setting speed value generally can be satisfied with various vehicles.

Greater than a plurality of speed of this setting speed can be 31,32,33 ... VmaxKm/h.Accuracy generally can meet the demands.

Permanent torque forces machine can be permanent torque motor of commutator or oil motor etc.

Advantage of the present invention is: test speed is fast, efficient is high, can realize continuous detecting, and test data is accurate, test safety, and equipment cost is low, is convenient to popularize.

Be described further below in conjunction with embodiment and accompanying drawing, but not as a limitation of the invention.

Fig. 1 is its primary structure synoptic diagram.

Fig. 2 asks moment of inertia software programming synoptic diagram among Fig. 1.

Fig. 3 is a measurement of power software programming synoptic diagram among Fig. 1.

Among Fig. 1,1 is two coaxial drive rolls, 2 is two driven cylinders, be convenient to 2 driving wheels of bearing automobile, perseverance is turned round active engine 4 and is linked to each other with drive roll by clutch coupling 3, and is provided with clutch operating device, vehicle hoisting mechanism, light electricity velocity sensor and computing machine, software program and characteristic are as follows.

The program and the step of testing automobile chassis output power:

1, the wheel with automobile drive axle two limits is parked between two cylinders, and lifting mechanism descends, so that wheel can be changeed.

2, the vehicle measurement of power step to unknown automobile moment of inertia is as follows:

(1) stop, flame-out, variator puts direct retaining, choke, throttle wide.(drive wheels and engine quicken rotation for 5KW, 2000 rev/mins of rated speeds, after speed reaches a certain rotating speed, cut off power source, and wheel is stopped gradually starting Heng Niudongliyuan.Computing machine has been calculated its angular acceleration β in this process, according to J=M/ β, can obtain this car moment of inertia, and be placed in the internal memory, shows the moment of inertia value simultaneously, so that the operator writes down the moment of inertia of this vehicle, directly uses when meeting this vehicle in order to next time.

(2) use the clutch separation engine.Engine turn round rapidly (variator is put direct high).

During measurement of power, anxious step on the gas on earth, the engine band wheel etc. and was quickened rotation this moment, when speed no longer increases, received throttle, plucked shelves, and wheel is stopped naturally.

In the process of quickening, computing machine with continuous acquisition angle speed omega i (from 30Km/h, the every increase of speed 1Km/h, adopt a ω i value) and the value of angular acceleration β (β=d ω/dt) wherein, instantaneous power Ni=J ω i β can calculate so, computing machine is the power (becoming KW) under the various speed (the ω value is become linear velocity Km/h indicating value) storage (understanding power under each speed, also printable output as need), and Nmax and corresponding speed shown prints.

3, to the vehicle measurement of power of known automobile moment of inertia

Before the measurement of power, at first insert the moment of inertia of this vehicle, the measurement of power process as above.

The effect of invention:

(1) owing to adopts an accelerator to obtain the power under each speed come its test speed Inevitable greatly improve (about 15-20 times), because of the vehicle to known rotary inertia, not its rotation of demand Inertia, a foot throttle gets final product.

(2) electric vortex flow dynamometer machines, price 230,000, expensive just being valued for by on vortex flow machine and the match appliance. And the cost-saved 6-7 ten thousand of this dynamometer machine, this must be conducive to popularize.

Special safety requirements is arranged, preferably front-wheel two when (3) electric vortex flow dynamometer machine is to the front drive automobile measurement of power Side has roller spacing, to guarantee test safety. The present invention does not then have this problem, and test safety is reliable.

Claims

1, a kind of work-measuring machine for non-load car chassis, comprise coaxial two drive rolls (1) and two driven cylinders (2), vehicle hoisting mechanism, speed pickup and computing machine, it is characterized in that drive roll passes through clutch coupling (3) and a perseverance and turns round initiatively that engine (4) links to each other, computer software has following structure and characteristics:

A, ask moment of inertia software program characteristic as follows:

In that permanent torque forces is anti-when dragging automobile to quicken, the wheel speed of automobile will constantly increase, computing machine is constantly gathered the pulse signal of cylinder rotation, whether the speed of seeing cylinder reaches a certain rotating speed, as reach, time pulse of continuous acquisition then is so that try to achieve angular acceleration β, moment of inertia J=M/ β can obtain so, exports display screen to and gets final product;

2, dynamometer machine according to claim 1 is characterized in that the minimum rated velocity amplitude gets 30Km/h.

3, dynamometer machine according to claim 2, it is characterized in that a plurality of speed greater than this setting speed be 31,32,33 ... VmaxKm/h.

4,, it is characterized in that permanent torque forces machine is permanent torque motor of commutator or oil motor according to claim 1,2 or 3 described dynamometer machines.