CN113465937B - Brake system interference detection system based on K & C test bed and detection method thereof - Google Patents
Brake system interference detection system based on K & C test bed and detection method thereof Download PDFInfo
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- CN113465937B CN113465937B CN202110602707.XA CN202110602707A CN113465937B CN 113465937 B CN113465937 B CN 113465937B CN 202110602707 A CN202110602707 A CN 202110602707A CN 113465937 B CN113465937 B CN 113465937B
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Abstract
The invention discloses a braking system interference detection system based on a K & C test bed, which comprises a controller, the K & C test bed and a detection device, wherein the controller is used for controlling the K & C test bed to enable a vehicle suspension to be in a zero position state, an upper limit state and a lower limit state respectively, and controlling the K & C test bed to enable a steering wheel to be in a return position, a left-turning limit position and a right-turning limit position respectively and to judge whether the braking system passes an interference test or not, and the K & C test bed is used for driving the vehicle suspension to move up and down relative to a vehicle body and driving the steering wheel to rotate; the invention also discloses a detection method of the brake system interference detection system based on the K & C test bed, which comprises nine-limit working condition detection, steering dynamic detection and suspension dynamic detection. The invention respectively considers the influences of the limit position of the suspension, the limit position of the steering wheel, the lifting speed of the suspension and the steering angular speed of the steering wheel, and improves the accuracy of the interference test of the braking system.
Description
Technical Field
The invention relates to the technical field of brake system interference detection, in particular to a brake system interference detection system based on a K & C test bed and a detection method thereof.
Background
In the early development period of vehicles, especially the first test sample vehicles, the interference of the vehicles, especially the interference of chassis moving parts, occurs at various places due to various reasons. When the vehicle runs, due to the movement of a suspension and a steering system of the vehicle, the shape of the brake system pipeline parts is changed, and the brake system pipeline parts comprise a hydraulic brake hose, a parking brake flexible shaft, a wheel speed sensor wire harness, an electronic parking wire harness and the like. It is necessary to ensure that the brake should not interfere with adjacent components during all movements to avoid damage to the flexible lines and consequent failure of the brake system or alarm.
The brake system flexible lines are used to connect components on the vehicle body (brake hard tubes, parking handles, vehicle body wiring harnesses, etc.) to wheel-side components (line/parking brakes, ring gears, etc.). In order to ensure that the brake system can work effectively, the flexible pipeline is not interfered with adjacent parts in all movement processes, so that the flexible pipeline is prevented from being damaged, and the brake system is further prevented from being out of work or giving an alarm.
At present, most of cars and light automobiles adopt hydraulic transmission for a service braking system, and a parking braking system is applied to a rear wheel and adopts a mechanical type or an electronic type. The wheel speed sensors required by the ABS/ESC configuration need to acquire wheel speed information of four wheels respectively. For a front axle (steering axle) of a passenger vehicle, the motion states of a brake hose and a wheel speed sensor need to be tested and detected; for a rear axle (non-steering axle) of a passenger car, the motion states of a brake hose, a wheel speed sensor and a parking flexible shaft (or an electronic parking harness) need to be tested and detected.
Chinese patent CN109596369A discloses a test bench for suspension steering motion interference and a test method for suspension steering motion interference, which specifically points out a device and a method for testing a single front axle longitudinal leaf spring type dependent suspension system and a longitudinal tie rod type steering system, which have interference problems in the deformation process of leaf springs. And, this patent is through horizontal loading mechanism and vertical loading mechanism application load to obtain the curve that the pull rod interference amount corresponds. The patent does not consider the influence of the steering speed of the steering wheel and the lifting speed of the suspension on the motion state of the flexible pipeline of the braking system when the steering wheel and the suspension are in extreme states respectively.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a brake system interference detection system based on a K & C test bed and a detection method thereof.
In order to achieve the purpose, the invention provides a brake system interference detection system based on a K & C test bed, which comprises a controller, the K & C test bed and a detection device;
the controller is used for controlling the K & C test bed to enable the vehicle suspension to be in a zero position state, an upper limit state and a lower limit state respectively, controlling the K & C test bed to enable the steering wheel to be in a return position, a left-turning limit position and a right-turning limit position respectively in each state, and judging whether the brake system passes an interference test or not;
the K & C test bed is used for driving a vehicle suspension to move up and down relative to a vehicle body and driving a steering wheel to rotate;
the detection device is used for measuring the minimum distance between the component to be detected and the environment piece.
Further, K & C test bench includes steering wheel drive mechanism, steering wheel drive mechanism is including the steering wheel fixture that is used for centre gripping steering wheel to and be used for driving the rotatory steering wheel rotation motor of steering wheel fixture.
Further, the K & C test bench comprises a suspension positioning mechanism, and the suspension positioning mechanism comprises a vehicle body clamping mechanism used for clamping a vehicle body and a jacking mechanism used for jacking the vehicle body or wheels.
Further, the measuring device is a distance meter or a camera device with a dynamic distance measuring function.
Further, the controller is also used for controlling the steering wheel driving mechanism to drive the steering wheel to rotate at a constant speed to a left-turning limit position and a right-turning limit position at different angular speeds from a return-to-positive position when the suspension is in a zero-position state, an upper limit state and a lower limit state respectively.
Further, the controller is also used for controlling the suspension positioning mechanism to drive the suspension to move from the zero position state to the upper limit state and the lower limit state at a constant speed at different lifting speeds when the steering wheel is respectively at the left-turning limit position, the return-to-positive position and the right-turning limit position.
The invention also provides a detection method of the brake system interference detection system based on the K & C test bed, which comprises the following steps: the vehicle is placed on a K & C test bed for wheel positioning, a suspension of the vehicle is respectively in a zero position state, an upper limit state and a lower limit state, a steering wheel is respectively in a return position, a left-turning limit position and a right-turning limit position in each state, the minimum distances between the component to be measured and an environment piece are respectively measured, and when the minimum distances of each component to be measured are smaller than the minimum distance threshold of the component to be measured, the braking system passes an interference test.
Further, the method for enabling the suspension of the vehicle to be in the upper limit state comprises the steps of clamping and fixing the vehicle body and jacking the wheel until the suspension is located at the upper limit position.
Further, the method for enabling the suspension of the vehicle to be in the lower limit state comprises the steps of releasing the limit between the vehicle body and the wheels, and jacking the vehicle body until the wheels completely and freely droop.
And further, the method also comprises dynamic steering detection, when the suspension is in a zero position state, an upper limit state and a lower limit state respectively, the steering wheel is driven to rotate to a left-turning limit position and a right-turning limit position at a constant speed at different angular speeds from the return position, and the minimum distance between the component to be detected and the environmental component is measured in the steering wheel rotating process.
And further, suspension dynamic detection is further included, when the steering wheel is respectively positioned at a left-turn limit position, a return-to-normal position and a right-turn limit position, the suspension is driven to move from a zero position state to an upper limit state and a lower limit state at a constant speed at different lifting speeds, and the minimum distance between the component to be measured and the environmental component is measured in the lifting process of the suspension.
Further, the part to be tested comprises a brake hose, a wheel speed sensor, a parking flexible shaft or an electronic parking wire harness.
The invention has the beneficial effects that: and various limit states and actual influence factors are considered, and the accuracy of the interference test of the brake system is improved. The invention utilizes the K & C test bed to respectively adjust the suspension and the steering wheel of the vehicle to a plurality of limit positions, measure the minimum position of the part to be measured and the environmental part, then respectively drive the suspension and the steering wheel to uniformly lift or rotate to the limit positions at different speeds, measure the minimum distance between the part to be measured and the environmental part in the dynamic process, and finally judge whether the minimum distance meets the design requirements or not.
Drawings
FIG. 1 is a schematic diagram of an interference detection system according to the present invention.
The components in the figures are numbered as follows: the test stand comprises a controller 100, a K & C test stand 200, a steering wheel driving mechanism 210, a steering wheel clamping mechanism 211, a steering wheel rotating motor 212, a suspension positioning mechanism 220, a vehicle body clamping mechanism 221, a jacking mechanism 222 and a detection device 300.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention and to enable those skilled in the art to more clearly understand the claims. The scope of the invention is not limited to the following specific examples. It is within the purview of one skilled in the art to effect the invention in variations of the embodiments described below including what is claimed herein and other embodiments.
As shown in FIG. 1, the brake system interference detection system based on the K & C test stand comprises a controller 100, a K & C test stand 200 and a detection device 300, wherein the controller 100 is respectively in communication connection with the K & C test stand 200 and the detection device 300.
The K & C test stand 200 is used for driving a vehicle suspension to move up and down relative to a vehicle body and driving a steering wheel to rotate. In this embodiment, the K & C test stand 200 includes a steering wheel driving mechanism 210, and the steering wheel driving mechanism 210 includes a steering wheel holding mechanism 211 for holding a steering wheel, and a steering wheel rotating motor 212 for driving the steering wheel holding mechanism 211 to rotate. In this way, the steering wheel can be driven by the steering wheel driving mechanism 210 to automatically rotate to the left-turn limit position, the return-to-center position, the right-turn limit position, and to rotate from the return-to-center position to the limit position at different angular velocities.
In this embodiment, the K & C test stand 200 includes a suspension positioning mechanism 220, and the suspension positioning mechanism 220 includes a vehicle body holding mechanism 221 for holding a vehicle body, and a lifting mechanism 222 for lifting the vehicle body or a wheel. In this way, the suspension can be driven to automatically ascend and descend to and from the upper limit state and the lower limit state by the suspension positioning mechanism 220, and the suspension can be driven to ascend and descend from the zero state to and from the upper limit state and the lower limit state at different ascending and descending speeds, wherein the zero state refers to the position state of the suspension when the wheel is parked on the K & C test stand and is kept still.
The detection device 300 is a distance meter or a camera device having a dynamic distance measurement function. The device is used for measuring the minimum distance between the part to be measured and the environment part when the vehicle is static, and is used for measuring the minimum distance between the part to be measured and the environment part in the dynamic process when the steering wheel rotates or the suspension frame is lifted.
The controller 100 is configured to control the K & C test stand 200 to respectively place the vehicle suspension in a zero position state, an upper limit state, and a lower limit state, and in each state, control the K & C test stand 200 to respectively place the steering wheel in a return position, a left-turn limit position, and a right-turn limit position, and to determine whether the braking system passes through an interference test, where the determination is based on that a plurality of minimum distances of the to-be-measured component are all smaller than a minimum distance threshold of the to-be-measured component.
In this embodiment, the controller 100 is further configured to control the steering wheel driving mechanism 210 to drive the steering wheel to rotate from the return-to-normal position to the left-turn limit position and the right-turn limit position at different angular speeds, respectively, when the suspension is in the null position, the upper limit state, and the lower limit state, respectively. The controller 100 is further configured to control the suspension positioning mechanism 220 to drive the suspension to move from the zero position state to the upper limit state and the lower limit state at a constant speed at different lifting speeds when the steering wheel is at the left-turn limit position, the return-to-normal position and the right-turn limit position, respectively.
The detection method of the brake system interference detection system based on the K & C test stand comprises the following steps:
1. and detecting nine limit working conditions. Firstly, a vehicle is placed on a K & C test bed for wheel alignment, a controller 100 controls a suspension positioning mechanism 220 to drive a suspension to lift according to a test program instruction, so that the suspension of the vehicle is respectively in a zero position state, an upper limit state and a lower limit state, and in each state, the controller 100 controls a steering wheel driving mechanism 210 to drive a steering wheel to rotate, so that the steering wheel is respectively in a return position, a left-turning limit position and a right-turning limit position, and thus, nine limit working conditions are divided in total as shown in Table 1.
In this embodiment, because the front axle belongs to the directive wheel, and the rear axle belongs to non-directive wheel, therefore the position that the braking system of front wheel awaits measuring can receive the influence of the different steering angle of steering wheel, and the rear wheel is then not influenced, therefore the piece that awaits measuring of front wheel braking system need detect all nine operating modes in table 1, and the piece that awaits measuring of rear wheel braking system only need detect operating mode 2, 5, 8 in table 2 can.
TABLE 1 Limit working condition graduation Table
In the present embodiment, a method of bringing a suspension of a vehicle into an upper limit state includes: the vehicle body clamping mechanism 221 is controlled to clamp and fix the vehicle body, and the jacking mechanism 222 is controlled to jack the wheel until the suspension is located at the upper limit position. The method for enabling the suspension of the vehicle to be in the lower limit state comprises the following steps: the vehicle body clamping mechanism 221 is controlled to release the limit between the vehicle body and the wheels, and the jacking mechanism 222 is controlled to jack the vehicle body until the wheels completely and freely droop.
The minimum distances between the to-be-measured component and the environment pieces are respectively measured by the measuring device 300, and because the environment pieces of the to-be-measured component are multiple, when the multiple minimum distances of each to-be-measured component are smaller than the minimum distance threshold of the to-be-measured component, the interference test under the nine limit working conditions is qualified.
In this embodiment, the parts to be tested of the front wheel braking system are a brake hose and a wheel speed sensor, and the environmental parts are a front shock absorber, a stabilizer bar boom, a triangle arm, a driving shaft and a steering tie rod, which are detailed in table 2; the parts to be tested of the rear wheel braking system are a brake hose, a wheel speed sensor, a parking flexible shaft or an electronic parking wire harness, and the environmental parts are a vehicle body, a rear shock absorber, a torsion beam and a fuel tank, which are detailed in table 3.
TABLE 2 recording chart of minimum distance between front wheel to-be-measured piece and environment piece
TABLE 3 recording chart of minimum distance between the rear wheel to-be-measured piece and the environmental piece
2. And when the plurality of minimum distances of each part to be detected are smaller than the minimum distance threshold of the part to be detected, the dynamic steering detection under the three limit working conditions is qualified.
3. And suspension dynamic detection, namely when the steering wheel is respectively positioned at a left-turn limit position, a return-to-normal position and a right-turn limit position, driving the suspension to respectively move to an upper limit state and a lower limit state at a constant speed at different lifting speeds from a zero-position state, measuring the minimum distance between the part to be detected and an environmental part in the lifting process of the suspension, and when the minimum distances of each part to be detected are smaller than the minimum distance threshold of the part to be detected, the suspension dynamic detection under the three limit working conditions is qualified.
And finally, only when the nine-limit working condition detection, the steering dynamic detection and the suspension dynamic detection are qualified, the whole brake system interference test is qualified.
The invention utilizes the K & C test bed to respectively adjust the suspension and the steering wheel of the vehicle to a plurality of limit positions, measure the minimum position of the part to be measured and the environmental part, then respectively drive the suspension and the steering wheel to uniformly lift or rotate to the limit positions at different speeds, measure the minimum distance between the part to be measured and the environmental part in the dynamic process, and finally judge whether the minimum distance meets the design requirements or not.
Claims (10)
1. The utility model provides a braking system interferes detecting system based on K & C test bench which characterized in that: comprises a controller (100), a K & C test bed (200) and a detection device (300);
the controller (100) is used for controlling the K & C test bed (200) to enable the vehicle suspension to be in a zero position state, an upper limit state and a lower limit state respectively, controlling the K & C test bed (200) to enable the steering wheel to be in a return-to-positive position, a left-turning limit position and a right-turning limit position respectively in each state, and judging whether the brake system passes an interference test or not;
the K & C test bed (200) is used for driving a vehicle suspension to move up and down relative to a vehicle body and driving a steering wheel to rotate;
the detection device (300) is used for measuring the minimum distance between the component to be detected and the environment piece.
2. The K & C stand based brake system interference detection system of claim 1, wherein: the K & C test stand (200) comprises a steering wheel driving mechanism (210), wherein the steering wheel driving mechanism (210) comprises a steering wheel clamping mechanism (211) used for clamping a steering wheel, and a steering wheel rotating motor (212) used for driving the steering wheel clamping mechanism (211) to rotate.
3. The K & C stand based brake system interference detection system of claim 1, wherein: the K & C test bed (200) comprises a suspension positioning mechanism (220), wherein the suspension positioning mechanism (220) comprises a vehicle body clamping mechanism (221) for clamping a vehicle body and a jacking mechanism (222) for jacking the vehicle body or wheels.
4. The K & C stand based brake system interference detection system of claim 2, wherein: the controller (100) is also used for controlling the steering wheel driving mechanism (210) to drive the steering wheel to rotate from the return position to the left-turning limit position and the right-turning limit position at different angular speeds at a constant speed when the suspension is in the zero position state, the upper limit state and the lower limit state respectively.
5. The K & C stand-based braking system interference detection system of claim 3, wherein: the controller (100) is further used for controlling the suspension positioning mechanism (220) to drive the suspension to move from the zero position state to the upper limit state and the lower limit state at a constant speed at different lifting speeds when the steering wheel is located at the left-turning limit position, the return-to-positive position and the right-turning limit position respectively.
6. The detection method of the brake system interference detection system based on the K & C test bed is characterized by comprising the following steps of: the method comprises the steps of placing a vehicle on a K & C test bed for wheel positioning, enabling a suspension of the vehicle to be in a zero position state, an upper limit state and a lower limit state respectively, enabling a steering wheel to be in a return position, a left-turning limit position and a right-turning limit position respectively in each state, measuring the minimum distance between a component to be measured and an environment piece respectively, and when the minimum distances of each component to be measured are smaller than the minimum distance threshold of the component to be measured, enabling a braking system to pass an interference test.
7. The detection method of the brake system interference detection system based on the K & C test stand according to claim 6, characterized in that: the method for enabling the suspension of the vehicle to be in the upper limit state comprises the steps of clamping and fixing the vehicle body and jacking the wheel until the suspension is in the upper limit position.
8. The detection method of the brake system interference detection system based on the K & C test stand according to claim 6, characterized in that: the method for enabling the suspension of the vehicle to be in the lower limit state comprises the steps of releasing the limit between the vehicle body and the wheels, and jacking the vehicle body until the wheels completely and freely droop.
9. The detection method of the brake system interference detection system based on the K & C test stand according to claim 6, characterized in that: the method is characterized by further comprising dynamic steering detection, when the suspension is in a zero position state, an upper limit state and a lower limit state respectively, the steering wheel is driven to rotate to a left-turning limit position and a right-turning limit position at different angular speeds at a constant speed from a return position, and the minimum distance between a component to be detected and an environmental component is measured in the steering wheel rotating process.
10. The detection method of the brake system interference detection system based on the K & C test stand according to claim 6, characterized in that: the device also comprises suspension dynamic detection, when the steering wheel is respectively at a left-turn limit position, a return-to-normal position and a right-turn limit position, the suspension is driven to move from a zero position state to an upper limit state and a lower limit state at a constant speed at different lifting speeds, and the minimum distance between the part to be measured and the environmental part is measured in the lifting process of the suspension.
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| CN114993692A (en) * | 2022-04-11 | 2022-09-02 | 中国第一汽车股份有限公司 | Brake hose path test bed and test method |
| CN115343054A (en) * | 2022-04-11 | 2022-11-15 | 中国第一汽车股份有限公司 | Method for measuring clearance between automobile brake hose and peripheral parts |
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