CN112985658B - Chassis power measuring equipment based on IGBT technology - Google Patents

Abstract

The invention relates to the technical field of automobile chassis power measuring mechanical equipment, in particular to chassis power measuring equipment based on an IGBT (insulated gate bipolar transistor) technology, which comprises a base, a power measuring machine and a power measuring roller, wherein the power measuring machine is in transmission connection with the power measuring roller, and the chassis power measuring equipment also comprises a power measuring support, a centering mechanism, a rotary driving mechanism, a blocking mechanism and a lifting mechanism.

Description

A chassis dynamometer based on IGBT technology

technical field

The invention relates to the technical field of automobile chassis dynamometer mechanical equipment, in particular to a chassis dynamometer based on IGBT technology.

Background technique

Automobile chassis dynamometer is an important indoor bench test equipment. The chassis dynamometer can not only test the dynamic performance of the car, but also measure the emission indicators and fuel consumption under multiple working conditions. The function of the automobile chassis dynamometer is to simulate various working conditions of the vehicle by replacing the road surface with the drum surface by controlling the load simulation and loading device. Has the advantage of being unaffected by external conditions. It can quickly detect the car without disintegrating, and accurately reflect the technical status and performance of various mechanisms, systems and parts of the car. Chassis dynamometer can find faults and hidden dangers, help people take corresponding preventive and warranty measures, and ensure that the vehicle runs in good condition, thereby extending the service life of the vehicle, improving the transportation capacity, reducing production costs, reducing environmental pollution, and saving energy , to ensure the safe operation of the vehicle. In addition, the automobile chassis dynamometer can also be combined with the simulation test, which greatly shortens the research and development cycle of the automobile, discovers the defects in the design early, and provides a guarantee for the performance of the whole vehicle.

The main purpose of the chassis dynamometer is to measure power, so it is bound to involve the form of energy conversion. Its core equipment is the dynamometer unit, one of which converts mechanical energy into thermal energy, including hysteresis dynamometer, eddy current dynamometer Machines, mechanical dynamometers, hydraulic dynamometers, etc., not only cause energy waste, but also need to be equipped with heat dissipation equipment. The other type is an electric dynamometer, which is equivalent to a generator. It can convert the mechanical energy input by the prime mover into electrical energy and feed it back to the power grid. It is divided into two types: DC and AC. Maintenance, the advantage of the alternator is that it is maintenance-free, but the disadvantage is that the control is complicated.

The chassis dynamometer based on IGBT technology is designed through the safety design and intelligent transformation of the chassis dynamometer, using the single-tube IGBT high-current drive circuit of the CW eddy current dynamometer, including the rectifier module and the PWM signal to drive the excitation. A current generation module and a protection circuit module. The input end of the rectifier module is connected to the AC power supply, and its output end is connected to one end of the main coil of the dynamometer equipment, which is used to provide DC power for the main coil of the dynamometer equipment; the output end of the excitation current generation module is connected to the other end of the main machine coil of the dynamometer equipment to control the main engine coil. The excitation current is generated, so that the dynamometer equipment generates eddy current; the protection circuit module can protect the components in the excitation current generation module to work normally and stably, so as to make the drive circuit work stably, and then make the eddy current dynamometer work stably. Purpose.

The patent document with the patent number CN201280075616.4 discloses a chassis dynamometer capable of improving the constancy of the height of the vehicle relative to the ground. The chassis dynamometer includes a displacement portion that relatively displaces one of the load roller and the free roller with respect to the other. In the positioning state in which the relative position of the load roller relative to the wheel is fixed, the displacement part moves the free roller in the direction of approaching the load roller in the circumferential direction of the wheel, thereby reducing the load applied to the load roller and making the free roller move along the wheel's circumference. The circumferential direction moves away from the load roller, thereby increasing the load applied to the load roller.

However, due to the relative movement of the load roller and the free roller, the position of the vehicle will change to a certain extent, which will cause a certain error in the dynamometer. Moreover, the dynamometer roller is rotated by the friction of the wheels. Undesirable effects on the accuracy of the dynamometer, resulting in a decrease in the accuracy of the dynamometer.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention provides a chassis dynamometer device based on IGBT technology. The centering mechanism is used to align the wheel with the dynamometer roller, and then the dynamometer roller can obtain a certain amount of rotation in advance through the rotating drive mechanism. The dynamometer is then collided with the pre-rotated wheels to avoid the damage to the dynamometer at the moment of startup, and the car that has not been dynamometered is lifted by the lifting mechanism to change the weight of the car on the dynamometer roller, so as to change the friction force. For the purpose of solving the technical problem that the dynamometer accuracy is affected.

To achieve the above object, the present invention provides the following technical solutions:

A chassis dynamometer device based on IGBT technology, comprising a base, a dynamometer and a dynamometer roller, wherein the dynamometer is connected to the dynamometer roller in a driving manner, and further includes:

The dynamometer bracket, the dynamometer bracket is arranged in a slope shape, the dynamometer bracket is used for walking the car, along the walking path of the car, the dynamometer roller is installed on the dynamometer bracket, and the dynamometer roller is lower than The upper end face of the dynamometer bracket is arranged;

centering mechanism, the centering mechanism is symmetrically arranged on both sides of the dynamometer roller, the centering mechanism is oscillatingly mounted on the base, and the centering mechanism forms the cladding area of the wheel;

a rotary drive mechanism, which is installed below the centering mechanism, and drives the centering mechanism to swing, so that the wheels located in the cladding area descend and collide with the dynamometer rollers , and the rotary drive mechanism drives the dynamometer roll to rotate synchronously before the dynamometer roll does not interfere with the wheel;

A blocking mechanism, the blocking mechanism is arranged on the dynamometer bracket, the blocking mechanism is installed on the rear side of the centering mechanism along the walking path of the automobile, and the blocking mechanism is driven by the rotary drive mechanism to lift the alignment mechanism on the automobile Wheels that are not dynamized are limited; and

A lifting mechanism, the lifting mechanism is adjacent to the blocking mechanism, the blocking mechanism is mounted on the dynamometer bracket, and the lifting mechanism is used to lift the wheels of the automobile that are not subjected to dynamometer.

As an improvement, the dynamometer rollers are provided with two groups, and the dynamometer rollers are coaxially connected through a coupling.

As an improvement, the dynamometer support includes a drive-in support and a drive-out support, and the centering mechanism is located between the drive-in support and the drive-out support.

As an improvement, the centering mechanism includes:

a centering bracket, the centering bracket is arranged in an arc shape, and the lower end of the centering bracket is hingedly mounted on the base through a column; and

The rollers are arranged at equal distances along the arc direction of the centering bracket, and the rollers are used to support the wheel to be tested.

As an improvement, when the centering mechanism swings and unfolds, the rollers on the centering mechanism and the wheel to be tested are arranged in conflict with each other.

As an improvement, when the centering mechanism is folded, the roller on the top of the centering mechanism and the upper end surface of the dynamometer bracket are arranged to be flush with each other.

As an improvement, the rotary drive mechanism includes:

a drive shaft, the drive shaft is rotatably installed below the dynamometer bracket, the drive shaft is provided with a positive thread and a reverse thread, and the drive shaft is driven by a drive motor to rotate;

a nut, the nut is installed on the drive shaft, and the nut is installed at the positive thread and the reverse thread respectively;

a sliding plate, the sliding plate is installed on the nut, and the two ends of the sliding plate are installed with slider pairs; and

The connecting rod connects the centering mechanism and the sliding plate, and when the nut moves along the drive shaft, the centering mechanism is driven to swing.

As an improvement, a friction roller is installed on the drive shaft, the side wall of the friction roller is provided with a spiral friction pattern, and the side wall of the friction roller is provided with a notch. The friction pattern is related to the dynamometer. The roller friction drives the dynamometer roller to rotate, and when the notch is matched with the dynamometer roller, the friction roller is disengaged from the dynamometer roller.

As an improvement, the blocking mechanism includes:

a blocking roller, the blocking roller is arranged up and down, and the lower part of the blocking roller is provided with a lifting seat;

a screw rod, the screw rod is vertically installed under the lifting seat, and the top of the screw rod is fixedly connected with the lifting seat;

a screw nut, the screw nut is rotatably mounted on the base, and the screw nut is arranged in cooperation with the screw rod;

a worm wheel, the worm wheel and the screw nut are matched and connected, and the rotation of the worm wheel drives the rotation of the screw nut; and

The worm is arranged on the drive shaft, the worm rotates synchronously with the drive shaft, and the worm drives the worm wheel to rotate.

As an improvement, the lifting mechanism includes:

Lifting rollers, the lifting rollers are equidistantly arranged along the walking path of the vehicle;

a lift seat for mounting the lift roller; and

A lifting hydraulic cylinder is installed on the dynamometer bracket, and the lifting hydraulic cylinder drives the lifting seat to lift.

The beneficial effects of the present invention are:

(1) The present invention uses the centering mechanism to align the wheel and the dynamometer roller, and then the dynamometer roller obtains a certain amount of rotation in advance through the rotating drive mechanism, and then collides with the pre-rotated wheel to perform dynamometer, avoiding the start-up. Instantaneous damage to the dynamometer, and relying on the lifting mechanism to lift the car without dynamometer, change the weight of the car on the dynamometer roller, achieve the purpose of changing the friction force, and solve the technical problem that the dynamometer accuracy is affected;

(2) In the present invention, the dynamometer roller obtains a preliminary rotation speed through the friction of the friction roller while driving the centering mechanism to swing by the rotary drive mechanism, and when the dynamometer roller performs the dynamometer work, the gap on the friction roller The part cooperates with the dynamometer roller, and the friction roller will not interfere with the dynamometer roller;

(3) The present invention uses the rotating drive mechanism to drive the blocking rollers in the blocking mechanism to lift, and uses the blocking rollers to limit the position of the wheels of the car that are not dynamometer-measured, so as to ensure the stability of the vehicle during the dynamometer process, and also ensure the follow-up. The safety of the car during the lifting process of the car;

(4) The present invention changes the quality of the car acting on the dynamometer roller by raising the height of the car without the dynamometer wheel, so that the dynamometer roller is subjected to the frictional force of the wheel and changes accordingly, and due to the large mass of the car itself, By raising the center of gravity of the car, a large range of friction changes can be well simulated in a small range, and the simulation range is wider.

To sum up, the present invention has the advantages of high dynamometric accuracy, good simulation effect, safety and stability, etc., and is especially suitable for the technical field of automobile chassis dynamometer mechanical equipment.

Description of drawings

1 is a schematic diagram of the three-dimensional structure of the present invention;

Fig. 2 is the sectional structure schematic diagram of the present invention;

Fig. 3 is the working state structure schematic diagram of the present invention;

FIG. 4 is a schematic diagram of the connection structure of the dynamometer roller according to the present invention;

FIG. 5 is a schematic three-dimensional structure diagram of the rotary drive mechanism of the present invention;

FIG. 6 is a schematic diagram of the three-dimensional structure of the centering mechanism of the present invention;

Fig. 7 is the enlarged schematic diagram of the structure at A place in Fig. 2;

8 is a schematic diagram of the three-dimensional structure of the friction roller of the present invention;

Fig. 9 is the structure enlarged schematic diagram at B in Fig. 2;

FIG. 10 is a schematic diagram of the three-dimensional structure of the blocking mechanism of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

Example:

As shown in Figures 1 to 3, a chassis dynamometer device based on IGBT technology includes a base 1, a dynamometer 2 and a dynamometer roller 3, and the dynamometer 2 is connected to the dynamometer roller 3 by driving, Also includes:

The dynamometer bracket 4, the dynamometer bracket 4 is arranged in a slope shape, the dynamometer bracket 4 is used for walking the car, along the walking path of the car, the dynamometer bracket 4 is installed with the dynamometer roller 3, the The dynamometer roller 3 is arranged below the upper end face of the dynamometer bracket 4;

Centering mechanism 5, the centering mechanism 5 is symmetrically arranged on both sides of the dynamometer roller 3, the centering mechanism 5 is oscillatingly mounted on the base 1, and the centering mechanism 5 forms the covering of the wheel zone 50;

A rotary drive mechanism 6 is installed below the centering mechanism 5 , and the rotary drive mechanism 6 drives the centering mechanism 5 to swing, so that the wheels located in the cladding area 50 are lowered and The dynamometer roller 3 is in contact, and the rotary drive mechanism 6 drives the dynamometer roller 3 to rotate synchronously before the dynamometer roller 3 is not in contact with the wheel;

A blocking mechanism 7 is provided on the dynamometer bracket 4, the blocking mechanism 7 is installed on the rear side of the centering mechanism 5 along the walking path of the vehicle, and the blocking mechanism 7 is driven by the rotation Mechanism 6 drives the lift to limit the undynamized wheels on the vehicle; and

The lifting mechanism 8 is disposed adjacent to the blocking mechanism 7, the blocking mechanism 7 is mounted on the dynamometer bracket 4, and the lifting mechanism 8 is used to lift the wheels of the vehicle that are not subjected to dynamometer.

Further, the dynamometer rollers 3 are provided in two groups, and the dynamometer rollers 3 are coaxially connected through a coupling 31 .

Furthermore, the dynamometer bracket 4 includes a drive-in support 41 and an drive-out support 42 , and the centering mechanism 5 is located between the drive-in support 41 and the drive-out support 42 .

It should be noted that, the car drives in through the guide of the drive-in bracket 42. When the wheel that needs to be tested enters the covering area 50 formed by the combination of the centering mechanism 5, the wheel is just stuck in the covering area 50, and then Driven by the rotary drive mechanism 6, the centering mechanism 5 swings and opens, so that the wheel slowly descends to form a conflict with the dynamometer roller 3. During this process, the wheel and the dynamometer roller 3 automatically complete the centering work.

It is further explained that in the process of driving the centering mechanism 5 to open by the rotary driving mechanism 6, the rotary driving mechanism 6 will drive the dynamometer roller 3 to rotate by means of friction, so as to obtain a certain advance rotation speed, and the to-be-measured The working wheel will also start to rotate in the process of descending, so that when the wheel collides with the dynamometer roller 3, the rotating wheel cooperates with the synchronously rotating dynamometer roller, skipping the start-up stage from stationary to rotating directly.

It is further explained that when the friction force on the dynamometer roller 3 needs to be changed to simulate different dynamometer states, it is only necessary to lift the other side of the car through the lifting mechanism 8 to change the friction force on the dynamometer roller 3. friction force.

As shown in FIG. 6, as a preferred embodiment, the centering mechanism 5 includes:

The centering bracket 51, the centering bracket 51 is arranged in an arc shape, and the lower end of the centering bracket 51 is hingedly mounted on the base 1 through the upright column 52; and

The rollers 53 are arranged at equal distances along the arc direction of the centering bracket 51 , and the rollers 53 are used to support the wheel to be tested.

Further, when the centering mechanism 5 swings and unfolds, the rollers 53 on the centering mechanism 5 and the wheels to be tested are arranged in conflict with each other.

Furthermore, when the centering mechanism 5 is folded, the roller 53 on the top of the centering mechanism 5 is arranged to be flush with the upper end surface of the dynamometer bracket 4 .

It should be noted that, after the centering mechanism 5 is expanded and opened, the covering area 50 just covers the lower part of the wheel. By covering the covering area 50, the friction between the dynamometer roller 3 and the wheel will not make the wheel Arc-shaped depressions appear at the parts that conflict with the dynamometer rollers, which can better simulate the state of the wheels when driving on the road.

As shown in FIG. 5 to FIG. 7 , as a preferred embodiment, the rotary drive mechanism 6 includes:

A drive shaft 61, the drive shaft 61 is rotatably installed below the dynamometer bracket 4, the drive shaft 61 is provided with a positive thread 611 and a reverse thread 612, and the drive shaft 61 is driven by the drive motor 60 to rotate;

Nut 62, the nut 62 is installed on the drive shaft 61, and the nut is installed at the positive thread 611 and the reverse thread 612 respectively;

a sliding plate 63, the sliding plate 63 is mounted on the nut 62, and the two ends of the sliding plate 63 are mounted with slider pairs 64; and

The connecting rod 65 connects the centering mechanism 5 and the sliding plate 63 . When the nut 62 moves along the drive shaft 61 , the centering mechanism 5 is driven to swing.

As shown in FIG. 8 , further, a friction roller 613 is installed on the drive shaft 61 , the side wall of the friction roller 613 is provided with a spiral friction pattern 614 , and the side wall of the friction roller 613 is provided with a gap part, the friction pattern 614 and the dynamometer roller 3 are rubbed to drive the dynamometer roller 3 to rotate. When the gap part is matched with the dynamometer roller 3, the friction roller 613 and the dynamometer roller disengage.

As shown in Figure 10, further, the blocking mechanism 7 includes:

The blocking roller 71, the blocking roller 71 is arranged up and down, and the lower part of the blocking roller 71 is provided with a lifting seat 72;

A screw rod 73, the screw rod 73 is vertically installed under the lifting seat 72, and the top of the screw rod 73 is fixedly connected to the lifting seat 72;

A lead screw nut 74, the lead screw nut 74 is rotatably mounted on the base 1, and the lead screw nut 74 is arranged in cooperation with the lead screw 73;

a worm wheel 75, the worm wheel 75 is arranged in cooperation with the screw nut 74, and the rotation of the worm wheel 75 drives the rotation of the screw nut 74; and

The worm 76 is disposed on the drive shaft 61 , the worm 76 rotates synchronously with the drive shaft 61 , and the worm 76 drives the worm wheel 75 to rotate.

It should be noted that the drive motor 60 drives the drive shaft 61 to rotate, and through the rotation of the drive shaft 61, the nut 62 is matched with the setting of the positive thread 611 and the reverse thread 612, so that the nut 62 moves toward or away from the sliding plate 63. It is arranged with the connecting rod 65 to drive the centering mechanism 5 to swing, so as to realize the contraction and expansion of the centering mechanism 5 .

It is further explained that when the driving shaft 61 rotates, the friction roller 613 is driven to rotate, so that the friction roller 613 causes the dynamometer roller 3 to perform pre-rotation to obtain a certain initial speed.

It is further explained that when the drive shaft 61 rotates, the worm 76 is driven to rotate, and by the cooperation of the worm wheel 75 and the lead screw nut 74, the lead screw 73 is lifted upward, and the blocking roller 71 is lifted to achieve the limited purpose.

As shown in FIG. 9, as a preferred embodiment, the lifting mechanism 8 includes:

Lifting rollers 81, the lifting rollers 81 are arranged equidistantly along the traveling path of the vehicle;

a lift seat 82 for mounting the lift roller 81; and

The lifting hydraulic cylinder 83 is installed on the dynamometer bracket 4 , and the lifting hydraulic cylinder 83 drives the lifting seat 82 to lift.

It should be noted that the comparative literature mentioned in the background art discloses that the purpose of adjusting the friction force of the load roller is achieved by changing the free roller, but once the free roller is adjusted, the alignment between the wheel and the load roller cannot be achieved, which is It will have a great impact on the accuracy of the dynamometer of the car. Therefore, the wheel that has not been tested is lifted by the lifting mechanism 8 to achieve the purpose of changing the friction between the dynamometer wheel and the dynamometer roller 3. In the process of frictional force, the covering area 50 of the centering mechanism 5 can well cover and limit the wheel for dynamometer testing, so as to ensure the centering without deviation.

work process:

The car drives in through the guide of the drive-in bracket 42 . When the wheel that needs to be tested enters the cladding area 50 formed by the combination of the centering mechanism 5 , the wheel is just stuck in the cladding area 50 . drive, so that the centering mechanism 5 swings and opens, so that the wheel slowly descends to form a conflict with the dynamometer roller 3. During this process, the wheel and the dynamometer roller 3 automatically complete the centering work, and the centering mechanism 5 During the swinging and opening process, when the driving shaft 61 rotates, it drives the friction roller 613 to rotate, so that the friction roller 613 causes the dynamometer roller 3 to perform pre-rotation to obtain a certain initial speed, and the dynamometer The wheel also enters the stage of rotation when it cooperates with the dynamometer roller 3. In addition, the worm 76 is driven to rotate while the drive shaft 61 is rotating. It lifts up to drive the blocking roller 71 to lift up, so as to achieve the purpose of limiting the position of the vehicle.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (9)

1. The utility model provides a chassis dynamometer equipment based on IGBT technique, includes base (1), dynamometer machine (2) and dynamometer roller (3), dynamometer machine (2) with dynamometer roller (3) transmission is connected, its characterized in that still includes:

the power measuring support (4) is arranged in a slope shape, the power measuring support (4) is used for moving an automobile, the power measuring support (4) is provided with the power measuring roller (3) along the moving path of the automobile, and the power measuring roller (3) is arranged below the upper end face of the power measuring support (4);

the centering mechanisms (5) are symmetrically arranged on two sides of the dynamometer roll (3), the centering mechanisms (5) are arranged on the base (1) in a swinging mode, and the centering mechanisms (5) form a wheel coating area (50);

a rotary driving mechanism (6), the rotary driving mechanism (6) is installed below the centering mechanism (5), the rotary driving mechanism (6) drives the centering mechanism (5) to swing, so that the wheel in the cladding area (50) descends to collide with the power measuring roller (3), the rotary driving mechanism (6) drives the power measuring roller (3) to rotate before the power measuring roller (3) collides with the wheel, the rotary driving mechanism (6) comprises a driving shaft (61), the driving shaft (61) is installed below the power measuring bracket (4) in a rotating mode, a positive thread (611) and a negative thread (612) are arranged on the driving shaft (61), the driving shaft (61) is driven by a driving motor (60) to rotate, a friction roller (613) is installed on the driving shaft (61), and a friction roller (614) with spiral grains is arranged on the side wall of the friction roller (613), a notch (615) is formed in the side wall of the friction roller (613), the friction grains (614) and the dynamometer roller (3) rub to drive the dynamometer roller (3) to rotate, and when the notch (615) is matched with the dynamometer roller (3), the friction roller (613) is separated from the dynamometer roller (3);

the blocking mechanism (7) is arranged on the dynamometer support (4), the blocking mechanism (7) is installed on the rear side of the centering mechanism (5) along the traveling path of the automobile, and the blocking mechanism (7) is driven by the rotary driving mechanism (6) to lift to limit wheels which are not used for dynamometer on the automobile; and

lifting mechanism (8), lifting mechanism (8) with stop gear (7) neighbour establishes, this stop gear (7) install in on dynamometer support (4), and this lifting mechanism (8) are used for lifting the wheel that does not carry out the dynamometer on the car.

2. The chassis power measuring device based on the IGBT technology as claimed in claim 1, wherein there are two sets of the power measuring rollers (3), and the power measuring rollers (3) are coaxially connected through a coupling (31).

3. The chassis dynamometer device based on IGBT technology according to claim 1, characterized in that the dynamometer support (4) includes an incoming support (41) and an outgoing support (42), and the centering mechanism (5) is located between the incoming support (41) and the outgoing support (42).

4. The chassis dynamometer device based on IGBT technology according to claim 1, characterized by the centering mechanism (5) comprising:

the centering bracket (51) is arranged in an arc shape, and the lower end part of the centering bracket (51) is hinged to the base (1) through a vertical column (52); and

the rollers (53) are arranged at equal intervals along the arc direction of the centering bracket (51), and the rollers (53) are used for supporting a wheel to be tested.

5. The chassis dynamometer device based on the IGBT technology as claimed in claim 4, wherein when the centering mechanism (5) swings and unfolds, the rollers (53) on the centering mechanism (5) are arranged in interference fit with the wheels to be tested.

6. The chassis dynamometer device based on IGBT technology as per claim 4, characterized in that when said centering mechanism (5) is folded, the roller (53) on the top of said centering mechanism (5) is flush with the upper end surface of said dynamometer support (4).

7. The IGBT-technology-based chassis dynamometer device according to claim 1, wherein the rotary drive mechanism (6) further includes:

a nut (62), wherein the nut (62) is mounted on the driving shaft (61), and the nut is respectively mounted on the positive thread (611) and the negative thread (612);

a sliding plate (63), wherein the sliding plate (63) is installed on the nut (62), and sliding block pairs (64) are installed at two end parts of the sliding plate (63); and

the connecting rod (65) is connected with the centering mechanism (5) and the sliding plate (63), and the nut (62) drives the centering mechanism (5) to swing when moving along the driving shaft (61).

8. The IGBT-technology-based chassis dynamometer device according to claim 1, wherein the blocking mechanism (7) comprises:

the device comprises a blocking roller (71), wherein the blocking roller (71) is arranged in a lifting manner, and a lifting seat (72) is arranged at the lower part of the blocking roller (71);

the screw rod (73), the said screw rod (73) is mounted vertically under the said lifting seat (72), the top of the screw rod (73) is fixedly connected with said lifting seat (72);

the screw rod nut (74), the said screw rod nut (74) is installed on said base (1) rotatably, the screw rod nut (74) cooperates with said feed screw (73) to set up;

the worm wheel (75), the worm wheel (75) is connected with the screw rod nut (74) in a matching way, and the worm wheel (75) rotates to drive the screw rod nut (74) to rotate; and

the worm (76) is arranged on the driving shaft (61), the worm (76) rotates synchronously with the driving shaft (61), and the worm (76) drives the worm wheel (75) to rotate.

9. The chassis dynamometer device based on IGBT technology according to claim 1, characterized in that the lifting mechanism (8) comprises:

the lifting rollers (81) are arranged at equal intervals along the traveling path of the automobile;

a lifting seat (82), wherein the lifting seat (82) is used for installing the lifting roller (81); and

and the lifting hydraulic cylinder (83), the lifting hydraulic cylinder (83) is installed on the dynamometer support (4), and the lifting hydraulic cylinder (83) drives the lifting seat (82) to lift.

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