CN102156014B

CN102156014B - Heavy vehicle chassis dynamometer

Info

Publication number: CN102156014B
Application number: CN2011100654045A
Authority: CN
Inventors: 吴明
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-10
Filing date: 2011-03-10
Publication date: 2012-07-04
Anticipated expiration: 2031-03-10
Also published as: CN102156014A

Abstract

The invention discloses a heavy vehicle chassis dynamometer. A front roller shaft, a middle roller shaft and a rear roller shaft and three left rollers and three right rollers are adopted, each rear roller has a larger diameter so as to adapt to detecting dual drive axle vehicles with different axle bases, the front and middle rollers have the same diameter and have smaller diameter than the rear rollers, and the loading torque of a power absorption device is reduced. The front rollers are main rollers, the rear rollers are free rollers and play a role in supporting only, and the power absorption device is not assembled and is not coupled to the front and middle rollers in a speed ratio way. An inertia flywheel is not assembled, equivalent inertia of a rack is reduced, the loading response sensitivity of the system is improved, and the inertia power error is reduced; moreover, the detection accuracy, operability and safety are improved.

Description

A kind of heavy goods vehicles chassis dynamometer

Technical field

A kind of heavy goods vehicles chassis dynamometer is the twin-roll chassis dynamometer that is suitable for the free cylinder of band of heavy goods vehicles bench test power performance, fuel economy performance, gas exhausting property, sliding performance, belongs to automotive performance checkout equipment technical field.

Background technology

The background technology reference paper of existing heavy goods vehicles chassis dynamometer: HJ/T292-2006 " technical requirement of diesel vehicle underlug-down mode method exhaust smoke measuring equipment " and JT/T445-2008 " road simulation dynamometer ".Following deficiency is arranged:

1, presses HJ/T292-2006; All diameter of cylinder of same chassis dynamometer equate; Heavy goods vehicles discharging detects adopts 3 drum shafts, 6 roller frames, and the coupling of 6 cylinders of chassis dynamometer can adopt machinery or electric power mode, before, during and after the speed ratio of cylinder be 1: 1.Because the centre distance of intermediate roll axle and back roll axle is bigger, linear velocity is higher, and the transmission noise is bigger.In order to adapt to the vehicle detection of different double drive axle wheelbases, design back roll diameter is bigger, causes diameter preceding, intermediate roll also bigger; Thereby increased the specified loading torque demand of device for power absorption, before, during and after the speed ratio of cylinder be to connect at 1: 1, the platform system equivalent inertia that the single drive axle heavy goods vehicles is detected is very big; Reach lengthening transit time of stable state speed of a motor vehicle point; Cross to load and strengthen, inertia power increases, and has reduced the accuracy, operability and the security that detect.

2, press JT/T445-2008; Front roll and back roll all are to be defined as master rotor; Be the cylinder with the coaxial connection of device for power absorption, promptly forward and backward drum shaft is coaxial at least respectively installs a device for power absorption, and two device for power absorptions have increased manufacturing cost; Strengthen stand roller system equivalent inertia, increased the complicacy of control.For overcoming the above-mentioned deficiency of prior art, innovated a kind of heavy goods vehicles chassis dynamometer.

Summary of the invention

A kind of heavy goods vehicles chassis dynamometer; 3 drum shafts and left and right totally 6 roller frames before, during and after the employing; Back roll adopts than major diameter to adapt to the vehicle detection of double drive axle disalignment distance; Diameter preceding, intermediate roll is identical, and is littler than back roll diameter, reduces the loading torque demand of device for power absorption.Front roll is a master rotor, only has that front roll and device for power absorption are coaxial to be connected, and back roll is free cylinder; Only play supporting role; Both do not connect, and do not carry out speed ratio yet and connect, improved the security that the double drive axle heavy goods vehicles detects with preceding, intermediate roll with device for power absorption is coaxial.Do not assemble inertial flywheel, reduce the roller system equivalent inertia of stand, improve drum shaft and vehicle power transmission total system response sensitivity, reduced heap(ed) capacity, reduce the inertia power error, improve detection efficiency loading.Its main technical characteristics with the effect as follows:

1, adopting 36 roller frames is the detections that adapt to the double drive axle heavy goods vehicles; Diameter preceding, intermediate roll is identical; The diameter of back roll is relatively bigger, has so both improved the accommodation of double drive axle disalignment apart from vehicle detection, a device for power absorption can only be installed on the front roll axle again just can satisfy the requirement of heavy goods vehicles detection loading force; Make simple in structurely, control simplifies, accurately, reliable.Can overcome the following defective of prior art;

Existing heavy goods vehicles chassis dynamometer, for adapting to the double drive axle disalignment apart from vehicle detection, confirm bigger back roll diameter earlier after; The diameter of cylinder of pressing before, during and after the standard-required is all the same; Thereby make preceding, the intermediate roll diameter is also bigger, causes the loading torque demand of device for power absorption to increase, and makes the temperature rise of air-cooled current vortex machine higher sooner; The heat fading rate is bigger; A common device for power absorption is difficult to satisfy heavy goods vehicles than the detection loading force requirement on the major diameter cylinder, often need be on the front roll axle two device for power absorptions of coaxial installation, make that cost increases, control is complicated.

2, front roll is a master rotor, only has that front roll and device for power absorption are coaxial to be connected, and back roll is free cylinder, only play supporting role, and both connects with device for power absorption is coaxial, does not also connect with preceding, intermediate roll speed ratio.When the single drive axle heavy goods vehicles detected, wheel was in the middle of preceding, intermediate roll, and free cylinder not effect does not rotate yet, and has reduced the equivalent inertia of stand roller system.When the double drive axle heavy goods vehicles detects; Only need the middle differential mechanism of locking double drive axle; Vehicle two drive axles are connected synchronously, and the jackshaft wheel detects preceding, the middle loading by front roll of intermediate roll, and the back axle wheel is free synchronization idle running on back roll; And back roll is very little to the horizontal applied force of back axle wheel, has guaranteed the security that detects.Can overcome the following defective of prior art:

On existing heavy goods vehicles chassis dynamometer; When the single drive axle heavy goods vehicles detects; By back roll idle running under the drive of preceding, intermediate roll speed ratio transmission in 1: 1, total system has increased the equivalent inertia of back roll axle, and to have increased back roll shaft power absorption plant loading force be zero control.When the double drive axle heavy goods vehicles detects; As the mean differential in the middle of the not locking double drive axle detects; Guarantee that mean differential is inoperative, it is consistent that the device for power absorption control loaded power on the then forward and backward drum shaft is wanted, and makes control system complicated like this; Load power if under the acting situation of mean differential, accurately measure, also can make control system complicated; Detect like the mean differential in the middle of the locking double drive axle, the synchronism of the device for power absorption loading force on the forward and backward drum shaft requires and can reduce, but possibly produce bigger parasitic power.From detecting safety analysis; The back axle wheel does not have angle of setting on back roll, the external force that whole vehicle is suffered is except the jackshaft wheel receives front roll horizontal component forward; The back axle wheel also receives back roll level driving force forward; Vehicle is very easily gone out check-out console, has serious detection potential safety hazard, and unsuitable measuring station is to surveying with car test.

3, because heavy goods vehicles can't be carried out the detection of bench teat transient simulation accelerating mode usually; Just steady state condition detects; So; This heavy goods vehicles chassis dynamometer does not assemble inertial flywheel, reduces the roller system equivalent inertia of stand as far as possible, overcomes the excessive system that causes of existing heavy goods vehicles dynamometer roller system equivalent inertia to loading the defective that the response sensitivity descends.

In reaching the loading moderating process of the stable state speed of a motor vehicle, stand roller system inertial force F=ma, N, m are the roller system equivalent inertia kg of stand, and a is the retarded velocity m/s of stand roller system ²If defining the number percent that the loading deceleration transient state loading force of same speed of a motor vehicle point device for power absorption surpasses the stable state loading force was heap(ed) capacity, as the identical stand cylinder retarded velocity a of control, then F is directly proportional with m; Stand roller system equivalent inertia is big more, and it is big more to cross heap(ed) capacity, and system inertia power is big more; System inertia power is big more; The steady state power accuracy of detection is low more, and is big more to the possibility of engine damage, and the possibility that vehicle is gone out the stand cylinder is also big more.In like manner, when controlling heap(ed) capacity one regularly, m is big more, and a is more little, and the loading procedure time that reaches stabilizing speed is long more, and system is poor more to the sensitivity that loads response.So; This heavy goods vehicles chassis dynamometer does not assemble inertial flywheel; Reduce stand roller system equivalent inertia as far as possible, improve stand and vehicle total system greatly, reduced heap(ed) capacity loading the sensitivity of response; Reduce the inertia power error, improve accuracy, operability and security that the heavy goods vehicles stable state detects.

4, preceding, intermediate roll can adopt 1: 1 connection of speed ratio, drag preceding, intermediate roll to carry out synthesis precision check and the check of stand loss power with motor is counter after, can remove preceding, 1: 1 connection of intermediate roll speed ratio.The synthesis precision check normally annually; The stand loss power is also relatively stable; Can be monthly or detect once quarterly or by half a year or by 1 year, import computing machine to preceding, intermediate roll system equivalent inertia and loss power, can remove preceding, 1: 1 connection of intermediate roll speed ratio then; When the various Performance Detection of heavy goods vehicles, can reduce parasitic power, improve detection accuracy.

Embodiment

A kind of heavy goods vehicles chassis dynamometer; Its embodiment is exemplified below: adopt 36 roller frames; Before, the diameter of intermediate roll is identical all be 300mm, the diameter of back roll is than the diameter of preceding, intermediate roll 450mm more greatly, the center of preceding, intermediate roll centre distance from the back roll distance of shaft centers from being 1346mm; It is master rotor that front roll is only arranged, and rated power of the coaxial installation of front roll is the air-cooled current vortex machine of 300kW.Back roll is free cylinder, only play supporting role, and has not both had the device for power absorption of coaxial connection, does not also connect with preceding, intermediate roll speed ratio.Preceding, intermediate roll can carry out speed ratio and connect at 1: 1; Drag preceding, intermediate roll to carry out after synthesis precision and loss power detect with motor is counter; Equivalent inertia and loss power input computing machine preceding, the intermediate roll axle, then, can remove preceding, 1: 1 connection of intermediate roll speed ratio; Stand does not assemble inertial flywheel, reduces the roller system equivalent inertia of stand.

When the single drive axle heavy goods vehicles detected on this heavy goods vehicles chassis dynamometer, back roll is inoperative not to rotate yet, and detection system inertia is little, is equivalent on the twin-roll chassis dynamometer to detect.When the double drive axle heavy goods vehicles detected, the mean differential in the middle of the locking double drive axle hung up the top gear of transmission for vehicles, and jackshaft is loaded by front roll in the middle of preceding, intermediate roll and detects, and the back axle wheel dallies on back roll; Thereby accurately, fast, carry out the various Performance Detection of heavy goods vehicles safely.

The advantage of this heavy goods vehicles chassis dynamometer is: simple in structure, cost is low, and stand roller system equivalent inertia is little; It is little to cross heap(ed) capacity, and the inertia power error is little, and detection efficiency is high; Security is good, has improved accuracy, operability and the security of the various Performance Detection of heavy goods vehicles greatly.

Claims

1. heavy goods vehicles chassis dynamometer; It is the twin-roll chassis dynamometer that is suitable for the free cylinder of band of heavy goods vehicles bench test power performance, fuel economy performance, gas exhausting property, sliding performance; It is characterized in that: 3 drum shafts and left and right totally 6 roller frames before, during and after the employing; Back roll adopts than major diameter to adapt to the vehicle detection of double drive axle disalignment distance; Diameter preceding, intermediate roll is identical, and is littler than back roll diameter, reduces the loading torque demand of device for power absorption; Front roll is a master rotor, only has that front roll and device for power absorption are coaxial to be connected, and back roll is free cylinder; Only play supporting role; Both do not connect, and do not carry out speed ratio yet and connect, thereby improved the security that the double drive axle heavy goods vehicles detects with preceding, intermediate roll with device for power absorption is coaxial; Drum shaft does not assemble inertial flywheel, reduces the roller system equivalent inertia of stand, thereby improves drum shaft and the response sensitivity of vehicle power transmission total system to loading, and reduces heap(ed) capacity, reduces the inertia power error, improves detection efficiency.