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CN-121994472-A - Method and system for detecting shaking amount of brake pedal

CN121994472ACN 121994472 ACN121994472 ACN 121994472ACN-121994472-A

Abstract

The invention relates to the technical field of part detection, in particular to a method and a system for detecting the fluctuation amount of a brake pedal, which are characterized in that after the pedal is used for simulating a loading angle to be fixed, the servo electric cylinder sequentially applies a force of +/-9.8N in the lateral direction, the force control contact and displacement synchronous triggering technology is adopted to accurately collect displacement values at two sides, the total shaking amount is calculated, and the total shaking amount is compared with a standard value (less than or equal to 4 mm) for judgment. The system correspondingly comprises a positioning and fixing device, a transverse loading device, a displacement detection device and a control processing device. The invention realizes full-automatic and high-precision detection and real-time judgment of the shaking amount of the pedal, automatically identifies and binds data by means of the product number, ensures single-piece accurate traceability of the detection data, and effectively improves the quality control level and the production efficiency of the product.

Inventors

  • HU KEMING
  • LEI SHIQUAN

Assignees

  • 重庆佳速汽车零部件有限公司

Dates

Publication Date
20260508
Application Date
20260409

Claims (7)

  1. 1. The method for detecting the shaking amount of the brake pedal is characterized by comprising the following steps of: fixing the pedal assembly to be tested on a detection station at a simulated loading angle; controlling a transverse loading device to apply a first target detection force in a first direction on a first side of a pedal to be detected, and triggering a displacement detection device to record a first displacement value when the first target detection force is reached; Controlling the transverse loading device to apply a second target detection force opposite to the first direction on a second lateral direction of the pedal to be detected, and triggering the displacement detection device to record a second displacement value when the second target detection force is reached; Calculating the lateral total shaking amount of the pedal to be tested based on the first displacement value and the second displacement value; comparing the lateral total shaking amount with a preset tolerance upper limit, and judging whether the pedal is qualified or not; after the failure is determined, the method further comprises the following steps: Ejecting an NG warning popup window containing product numbers, actually measured shaking amounts and exceeding standard information on a human-computer interface of an industrial control computer, and sending out an acousto-optic prompt; the on-site three-color alarm lamp is controlled to light and flash, and a starting button except for releasing the press clamp is locked; acquiring a treatment completion signal, and storing the treatment completion signal in association with a detection data record corresponding to the pedal to be detected; The method further comprises the steps of: Before the pedal to be tested is placed, a unique number is obtained through a code scanner or an RFID reader-writer and is transmitted to an industrial control computer and a PLC; The unique number is used as the current product ID of the current detection flow, and is associated with all process data and judgment results generated in the detection process; after the detection flow is finished, uploading and storing the complete data packet which is bound in a correlation way to a database, wherein the database supports inquiry and tracing according to the unique serial number of the product; Before the data packet is stored, checking whether the product ID in the data packet is consistent with the unique product number obtained initially, and triggering a binding error alarm if the product ID is inconsistent with the unique product number.
  2. 2. The method for detecting the amount of brake pedal rattle according to claim 1, wherein, The judgment condition for reaching the first target detection force or the second target detection force is that the force value fed back by the collected force sensor is stabilized within a target value preset error range and the preset stabilization time is continued; When the judging condition is reached, a hardware trigger signal is sent to the displacement detection device through a digital output port of the PLC, and the displacement value is synchronously latched and acquired.
  3. 3. The brake pedal shake amount detection method according to claim 1, wherein the process of controlling the lateral loading device to apply the first target detection force or the second target detection force includes an approach phase and a force control contact phase; the approaching stage is used for controlling the servo cylinder to move towards the pedal side loading point at a first speed; The force control contact stage is used for switching to force closed loop control when the force sensor detects that the contact force exceeds the contact threshold value, starting pre-judging deceleration when the real-time force value reaches a first proportion of the first target detection force or the second target detection force, and controlling the servo electric cylinder to perform creeping fine adjustment at a second speed when the real-time force value enters a fine adjustment window of the first target detection force or the second target detection force until the force value is stabilized within a target error zone, wherein the second speed is smaller than the first speed.
  4. 4. The brake pedal wobble detection method as set forth in claim 1, wherein the fixed pedal assembly includes an adaptive compression step: detecting a pedal put-in-place signal; The control clamping mechanism drives the pressing head to move towards the surface of the pedal; After triggering the touch induction switch, switching to set speed for compaction, and reading the numerical value of a compaction force sensor in real time; Stabilizing the compression force in a target compression force range through closed-loop control, and checking whether the displacement of the compression head is in a permission window; And judging that the compaction is successful only when the dual conditions of the compaction force and the displacement are satisfied.
  5. 5. A brake pedal shake amount detection system applied to the brake pedal shake amount detection method according to any one of claims 1 to 4, characterized by comprising: The positioning and fixing device is used for simulating a loading angle to fix the pedal assembly to be tested; the transverse loading device comprises a servo electric cylinder and a force sensor arranged at the force application end of the servo electric cylinder, and is used for applying a set first target detection force or second target detection force in the lateral direction of the pedal; the displacement detection device is used for detecting the lateral displacement of the pedal to be detected under the action of loading force in real time; The control and processing device is electrically connected with the transverse loading device and the displacement detection device and comprises a PLC and an industrial control computer, wherein the PLC is used for controlling the motion of the servo electric cylinder, receiving signals of the force sensor and the displacement detection device and calculating the total lateral shaking amount of the pedal, and the industrial control computer is used for man-machine interaction, data storage and tracing.
  6. 6. The brake pedal shake amount detection system according to claim 5, wherein the positioning and fixing device includes a press-clamping mechanism and a pedal-in-place photoelectric sensor; the pressing and clamping mechanism comprises a power unit, a transmission mechanism, a pressing head module, a pressing force sensor and a displacement detection unit which are integrated on the pressing head module or the transmission mechanism, and is used for realizing automatic pressing and double confirmation of a pressing state of the pedal; the pedal in-place photoelectric sensor is arranged on the side of the product positioning base and used for detecting whether the pedal is placed in place or not.
  7. 7. The brake pedal wobble detection system as set forth in claim 6, wherein, The PLC is configured with a self-adaptive force control algorithm module, and is used for controlling the servo electric cylinder to execute a loading process comprising an approach stage, a force control contact stage and a stable holding stage, and realizing closed-loop control and in-place triggering of a force value based on real-time feedback of the force sensor in the force control contact stage.

Description

Method and system for detecting shaking amount of brake pedal Technical Field The invention relates to the technical field of part detection, in particular to a method and a system for detecting the shaking amount of a brake pedal. Background The existing brake pedal assembly does not detect the transverse shaking amount before the production and shipment, so that the brake pedal assembly with the excessive shaking amount is installed in the whole automobile, the comfort level of the driver is affected, and the automatic and real-time detection and judgment of the transverse shaking amount in the pedal production process can not be realized along with the trampling abnormal sound. Disclosure of Invention The invention aims to provide a method and a system for detecting the shaking amount of a brake pedal, which realize the automatic, accurate and real-time detection and judgment of the horizontal shaking amount in the pedal production process. In order to achieve the above object, in a first aspect, the present invention provides a method for detecting a brake pedal shake amount, comprising the steps of: fixing the pedal assembly to be tested on a detection station at a simulated loading angle; controlling a transverse loading device to apply a first target detection force in a first direction on a first side of a pedal to be detected, and triggering a displacement detection device to record a first displacement value when the first target detection force is reached; Controlling the transverse loading device to apply a second target detection force opposite to the first direction on a second lateral direction of the pedal to be detected, and triggering the displacement detection device to record a second displacement value when the second target detection force is reached; Calculating the lateral total shaking amount of the pedal to be tested based on the first displacement value and the second displacement value; comparing the lateral total shaking amount with a preset tolerance upper limit, and judging whether the pedal is qualified or not; after the failure is determined, the method further comprises the following steps: Ejecting an NG warning popup window containing product numbers, actually measured shaking amounts and exceeding standard information on a human-computer interface of an industrial control computer, and sending out an acousto-optic prompt; the on-site three-color alarm lamp is controlled to light and flash, and a starting button except for releasing the press clamp is locked; acquiring a treatment completion signal, and storing the treatment completion signal in association with a detection data record corresponding to the pedal to be detected; The method further comprises the steps of: Before the pedal to be tested is placed, a unique number is obtained through a code scanner or an RFID reader-writer and is transmitted to an industrial control computer and a PLC; The unique number is used as the current product ID of the current detection flow, and is associated with all process data and judgment results generated in the detection process; after the detection flow is finished, uploading and storing the complete data packet which is bound in a correlation way to a database, wherein the database supports inquiry and tracing according to the unique serial number of the product; Before the data packet is stored, checking whether the product ID in the data packet is consistent with the unique product number obtained initially, and triggering a binding error alarm if the product ID is inconsistent with the unique product number. The judging condition for reaching the first target detection force or the second target detection force is that the force value fed back by the collected force sensor is stabilized within a target value preset error range and is kept for a preset stabilizing time; When the judging condition is reached, a hardware trigger signal is sent to the displacement detection device through a digital output port of the PLC, and the displacement value is synchronously latched and acquired. The process of controlling the transverse loading device to apply the first target detection force or the second target detection force comprises an approaching phase and a force control contact phase; the approaching stage is used for controlling the servo cylinder to move towards the pedal side loading point at a first speed; The force control contact stage is used for switching to force closed loop control when the force sensor detects that the contact force exceeds the contact threshold value, starting pre-judging deceleration when the real-time force value reaches a first proportion of the first target detection force or the second target detection force, and controlling the servo electric cylinder to perform creeping fine adjustment at a second speed when the real-time force value enters a fine adjustment window of the first target detection force or the second target detection force unti