CN112145598B - Test method for verifying wear alarm of wear-off brake lining by using inertia rack - Google Patents

Test method for verifying wear alarm of wear-off brake lining by using inertia rack Download PDF

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CN112145598B
CN112145598B CN202011008462.XA CN202011008462A CN112145598B CN 112145598 B CN112145598 B CN 112145598B CN 202011008462 A CN202011008462 A CN 202011008462A CN 112145598 B CN112145598 B CN 112145598B
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wear
abrasion
resistor
test
brake
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CN112145598A (en
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曾繁卓
李伟
王应国
张志�
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China Automotive Engineering Research Institute Co Ltd
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China Automotive Engineering Research Institute Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F16D66/021—Apparatus for indicating wear using electrical detection or indication means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F16D66/021—Apparatus for indicating wear using electrical detection or indication means
    • F16D66/028—Apparatus for indicating wear using electrical detection or indication means with non-electrical sensors or signal transmission, e.g. magnetic, optical

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention provides a test method for verifying an alarm function of a wear-off type brake lining alarm device by using an inertia rack, which comprises a brake shoe and a friction plate arranged on the surface of the brake shoe, wherein a fixed groove is arranged on the brake shoe, a thread groove or a threaded hole penetrating through the brake shoe is arranged at the bottom of the fixed groove, the size of the thread groove or the size of the threaded hole is smaller than that of the fixed groove, and a through hole for a wear-off type sensor wire harness to pass through is arranged at the bottom of the thread groove; the broken sensor wire harness is connected with the controller U1; the friction plate is provided with an accommodating groove or a through hole penetrating through the friction plate; and the controller U1 gives an alarm according to the data collected by the wear-off sensor. The invention can realize alarming on the abrasion degree of the friction plate, prompt a driver to replace the friction plate in time and enhance the experience.

Description

Test method for verifying wear alarm of wear-off brake lining by using inertia rack
Technical Field
The invention relates to the technical field of vehicle testing, in particular to a testing method for verifying a wear alarm of a wear-off type brake lining by using an inertia rack.
Background
At present, all service brakes of passenger cars, trucks and special operation vehicles with the total mass more than 3500kg, semitrailers with the total mass more than 3500kg and all dangerous goods transport vehicles generally adopt automatic brake clearance adjusting arms; although the use of self-aligning arms ensures an effective brake clearance between the brake shoes and the brake drum in the event of brake lining wear, the problem with them is that the driver neglects to pay attention to the brake lining wear.
Disclosure of Invention
The invention aims to at least solve the technical problems in the prior art, and particularly creatively provides a test method for verifying the wear alarm of a wear-off type brake lining by using an inertia rack.
In order to achieve the above purpose, the invention provides a test system for verifying the alarm function of a wear-off type brake lining wear alarm device by using an inertia rack, which comprises a brake shoe and a friction plate arranged on the surface of the brake shoe, wherein a fixing groove is arranged on the brake shoe, a thread groove or a threaded hole penetrating through the brake shoe is arranged at the bottom of the fixing groove, the size of the thread groove or the size of the threaded hole is smaller than that of the fixing groove, and a through hole for a wear-off type sensor wire harness to pass through is arranged at the bottom of the thread groove; the broken sensor wire harness is connected with the controller U1;
the friction plate is provided with an accommodating groove or a through hole penetrating through the friction plate;
the wear-off type sensor comprises an upper shell and a lower shell, wherein a wear degree module mounting seat for fixedly mounting a wear degree module is arranged in the upper shell, the wear degree module is fixedly mounted on the wear degree module mounting seat, and the wear degree module is used for collecting the wear degree of a friction plate;
a conversion module mounting seat for fixedly mounting a conversion module is arranged in the lower shell, and the conversion module is mounted on the conversion module mounting seat; the outer surface of the lower shell is provided with a support ring used for supporting on the fixing groove, the outer surface of the lower shell is also provided with a thread matched with the thread groove or the thread hole, and the thread is positioned at the lower part of the support ring;
and the controller U1 gives an alarm according to the data collected by the wear-off sensor.
In a preferred embodiment of the present invention, the wear degree module includes n wear resistances, which are respectively a1 st wear resistance, a 2 nd wear resistance, a 3 rd wear resistance, … …, and an nth wear resistance, where n is a positive integer greater than or equal to 1;
the first end of the 1 st abrasion resistor, the first end of the 2 nd abrasion resistor, the first end of the 3 rd abrasion resistor, … … and the first end of the nth abrasion resistor are respectively connected with the first connecting piece, and the second end of the 1 st abrasion resistor, the second end of the 2 nd abrasion resistor, the second end of the 3 rd abrasion resistor, … … and the second end of the nth abrasion resistor are respectively connected with the second connecting piece; namely n abrasion resistors are connected in parallel;
the conversion module includes: a first jack of the connecting sheet is connected with a first end of the first resistor and a first end of the second resistor respectively, a second end of the second resistor is connected with a first power supply VCC, a second jack of the connecting sheet is connected with a second end of the first resistor and a first end of the third resistor respectively, a second end of the third resistor is connected with a first end of the fourth resistor, and a second end of the fourth resistor is connected with a power supply ground; and the adjusting end of the resistor III is connected with the signal acquisition end PB4 of the controller U1.
In a preferred embodiment of the invention, the upper shell and the lower shell of the wear-off sensor are detachable structures, a first thread which is matched with the outer surface of the lower shell is arranged on the inner surface of the upper shell, and a second thread is arranged on the outer surface of the lower shell; the upper shell and the lower shell are disassembled and assembled through the first threads on the upper shell and the second threads on the lower shell;
or a third thread which is matched with the outer surface of the upper shell is arranged on the inner surface of the lower shell, and a fourth thread is arranged on the outer surface of the upper shell; the upper shell and the lower shell are disassembled and assembled through the fourth threads on the upper shell and the third threads on the lower shell.
In a preferred embodiment of the present invention, the power supply further includes a power supply module, and the power supply module includes: a power output terminal batt is connected with a first end of a switch S2, a second end of the switch S2 is respectively connected with a first end of a fuse F1 and a first end of a resistor R9, a second end of the resistor R9 is connected with an anode of a light emitting diode LED2, a cathode of the light emitting diode LED2 is connected with a power ground, a second end of the fuse F1 is connected with an anode of a diode D2, a cathode of a diode D2 is respectively connected with a cathode of a diode Z1, a first end of a capacitor C16, a first end of a capacitor C17 and a power voltage input terminal + Vin of a voltage chip U2, and an anode of the diode Z1, a second end of the capacitor C16 and a second end of the capacitor C17 are respectively connected with a power ground terminal of the voltage chip U2 and a switch terminal ON/OFF of the voltage chip U2;
a power supply voltage OUTPUT end OUTPUT of the voltage chip U2 is respectively connected to a first end of an inductor L3 and a cathode of a diode Z2, an anode of the diode Z2 is connected to a power ground, a second end of the inductor L3 is respectively connected to a first end of a capacitor C18 and a FEEDBACK end FEEDBACK of the voltage chip U2, a second end of the inductor L3 OUTPUTs a first power VCC, and a second end of the capacitor C18 is connected to the power ground.
In a preferred embodiment of the present invention, the audible and visual alarm module includes: a bright light driving signal input end IN2 of the driving chip U3 is connected with a bright light driving signal output end PB1 of the controller U1, an acoustic driving signal input end IN3 of the driving chip U3 is connected with an acoustic driving signal output end PB2 of the controller U1, and a common end COM1 of the driving chip U3 is connected with a power ground;
the bright light driving output end OUT2 of the driving chip U3 is connected with the first end of an input loop of the relay D5, the second end of the input loop of the relay D5 is connected with a +5V power supply, the first end of a normally open contact of the relay D5 is connected with a +12V power supply, the second end of the normally open contact of the relay D5 is connected with the first end of a bright light alarm LAMP LAMP, and the second end of the bright light alarm LAMP LAMP is connected with the power supply ground;
the acoustic driving output end OUT3 of the driving chip U3 is connected with the first end of an input loop of the relay D6, the second end of the input loop of the relay D6 is connected with a +5V power supply, the first end of a normally open contact of the relay D6 is connected with a +12V power supply, the second end of the normally open contact of the relay D6 is connected with the first end of an acoustic alarm SPEAKER, and the second end of the acoustic alarm SPEAKER is connected with a power ground.
The invention also discloses a testing device for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia bench, and the testing system for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia bench, which is disclosed by any one of claims 1 to 5, is arranged on the brake inertia bench simulation brake lining wear condition verification bench.
The invention also discloses a test method for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia rack, which comprises the following steps:
s1, verifying the installation work of the test system of the alarm function of the wear-off type brake lining wear alarm device by using an inertia rack:
s11, sequentially passing the broken sensor wire harness through the fixing groove and the threaded hole in sequence, or sequentially passing the broken sensor wire harness through the fixing groove, the threaded groove and the through hole in sequence; connecting the wear-off sensor wire harness with a controller U1;
s12, screwing the lower shell into the threaded hole or the threaded groove to enable the support ring to be supported in the fixing groove;
s13, inserting the first connecting piece into the first connecting piece inserting hole, inserting the second connecting piece into the second connecting piece inserting hole, and connecting and installing the first connecting piece and the second connecting piece through a first thread on the upper shell and a second thread on the lower shell, or connecting and installing the first connecting piece and the second connecting piece through a fourth thread on the upper shell and a third thread on the lower shell;
s14, fixedly mounting the friction plate on the brake shoe, and enabling the upper shell to be positioned in the accommodating groove or the through hole;
s2, installing the test system for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia stand as claimed in any one of claims 1 to 5 on a simulation brake lining wear condition verification stand of a brake inertia test stand;
and S3, testing.
In a preferred embodiment of the invention, the testing comprises:
s31, test preparation:
s311, calculating the rotation speed of the main shaft of the test bed
The rotating speed of a main shaft of the brake inertia test bed and the vehicle speed are converted according to the following relation:
n＝2.65v/r，
wherein n represents the rotation speed of the main shaft of the brake inertia test bed and has the unit r/min;
v represents the test vehicle speed in km/h;
r represents the rolling radius of the wheel in m;
s312, calculating the experimental rotational inertia
The experimental moment of inertia is calculated as follows:
I＝Gmr2，
wherein I represents a calculated value of the moment of inertia in kg.m2；
GmThe maximum design total mass of the automobile is distributed to the part of the mass born by the wheel corresponding to the tested brake according to the brake force distribution ratio design value, wherein the unit is kg;
r represents the rolling radius of the wheel in m;
s313, cutting and processing the brake lining
In order to save unnecessary 'wearing time', a machining mode is utilized to simulate the wearing working condition of the brake lining in the braking process, the thickness of the brake lining is cut, and the cutting is stopped when the cutting thickness is that 'the distance between the surface of a wearing head and the surface of the brake lining is 2-3 mm';
s32, specification of test conditions
S321, running-in test
(a) The initial braking speed is 50 km/h;
(b) the test cooling air speed is 11m/s, and the temperature of the cooling air is room temperature;
(c) the pressure of the brake pipeline is adjusted to ensure that the brake deceleration reaches 3.0m/s2Braking from the initial braking speed to the final speed of zero;
(d) the braking interval time is determined by controlling the initial temperature of the brake not to exceed 120 ℃;
(e) the running-in times are determined so that the contact area between the brake lining and the brake drum reaches more than 80 percent;
s322, benchmark test
(a) The initial braking temperature is 80 +/-2 ℃;
(b) the initial braking speed is 30 km/h;
(c) the braking deceleration is 3.0m/s2；
(d) The number of tests was 3.
S323, wear alarm function verification test
(a) The initial braking speed is 80 km/h;
(b) performing a test in a constant input mode, wherein the pressure of a brake pipeline is the same as that of a reference test, and braking is performed from an initial braking speed to a final speed of zero;
(c) the final brake temperature is less than or equal to 350 ℃;
(d) the test cooling air speed is 11m/s, and the temperature of the cooling air is room temperature;
(e) the function verification test frequency is determined by that the abrasion amount of the brake lining reaches the abrasion limit to trigger an alarm device to trigger an alarm signal.
In a preferred embodiment of the invention, the testing comprises:
calculating the abrasion degree of the friction plate in real time:
when the abrasion degree of the friction plate is greater than or equal to a preset first abrasion degree threshold value, an audible and visual alarm is given;
when the abrasion degree of the friction plate is larger than or equal to a preset second abrasion degree threshold value, and the preset second abrasion degree threshold value is larger than a preset first abrasion degree threshold value, an audible and visual alarm is sent out, and the brake inertia test bed is controlled to stop working.
In a preferred embodiment of the present invention, the method for calculating the degree of wear of the friction plate comprises:
s41, calculating an initial voltage acquisition value:
s411, initial resistance value R of abrasion degree module0：
Figure BDA0002696782220000061
Figure BDA0002696782220000062
Figure BDA0002696782220000063
Figure BDA0002696782220000064
Figure BDA0002696782220000065
Wherein R is0Representing an initial resistance value of the wear module;
R1a resistance value representing a1 st wear resistance;
R2a resistance value representing a 2 nd wear resistance;
R3a resistance value representing a 3 rd wear resistance;
R4a resistance value representing a 4 th wear resistance;
Rn-1representing the n-1 th abrasion electricityResistance value of the resistor;
Rna resistance value representing an nth wear resistance;
s412, determining whether the error value Q is within a preset error range:
Figure BDA0002696782220000071
wherein Q represents an error value;
V0representing the resistance value collected at the beginning;
VCCrepresents a first power supply VCC;
r1a resistance value representing a first resistance;
r2a resistance value representing a second resistance;
r3a resistance value representing a resistance three;
r3' denotes the tuning resistance value;
r4a resistance value representing a resistance four;
if the error value Q is within the preset error range, starting the test;
if the error value Q is not within the preset error range, replacing the grinding-off type sensor, and judging whether the error value Q is within the preset error range again;
s42, calculating the resistance R at the time tt：
Figure BDA0002696782220000081
Wherein, VtThe voltage value collected by the controller U1 at the moment t is represented;
Rtrepresents the resistance value at time t;
s43, calculating the wear number p-1 at the time t:
Figure BDA0002696782220000082
Figure BDA0002696782220000083
Figure BDA0002696782220000084
Figure BDA0002696782220000085
Figure BDA0002696782220000086
wherein p is 1,2,3, …, n;
s44, judging the size between the abrasion number p-1 and the preset first abrasion number threshold value and the preset second abrasion number threshold value:
if the abrasion number p-1 is greater than or equal to a preset first abrasion number threshold value, namely the abrasion degree of the friction plate is greater than or equal to a preset first abrasion degree threshold value, an audible and visual alarm is sent out;
and if the abrasion number p-1 is greater than or equal to a preset second abrasion number threshold value, and the preset second abrasion number threshold value is greater than a preset first abrasion number threshold value, sending out an audible and visual alarm and controlling the brake inertia test bed to stop working.
In conclusion, due to the adoption of the technical scheme, the wear degree of the friction plate can be alarmed, a driver is prompted to replace the friction plate in time, and the experience is enhanced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
FIG. 3 is a schematic view of the inertial test stand configuration of the present invention.
Fig. 4 is a schematic structural diagram of the present invention.
Fig. 5 is a schematic view of a wear-off sensor according to the present invention.
Fig. 6 is a schematic diagram of the circuit connections of the wear module and the conversion module of the present invention.
Fig. 7 is a schematic diagram of the circuit connections of the wear module and the conversion module of the present invention.
Fig. 8 is a schematic diagram of the power module circuit connection of the present invention.
Fig. 9 is a circuit diagram of the reset module according to the present invention.
FIG. 10 is a schematic circuit diagram of the acousto-optic alarm module of the present invention.
Fig. 11 is a schematic circuit diagram of the controller U1 according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The invention discloses a test system for verifying an alarm function of a wear-off type brake lining alarm device by using an inertia rack, which comprises a brake shoe 3 and a friction plate 2 arranged on the surface of the brake shoe 3, wherein a fixing groove 6 is arranged on the brake shoe 3, a thread groove 7 or a thread hole penetrating through the brake shoe 3 is arranged at the bottom of the fixing groove 6, the size of the thread groove 7 or the size of the thread hole is smaller than that of the fixing groove 6, and a through hole 8 for a wear-off type sensor wire harness 5 to pass through is arranged at the bottom of the thread groove 7; the grinding-off type sensor wire harness 5 is connected with a controller U1; be provided with the card reed mount pad that is used for fixed mounting card reed 4 on brake shoe 3, card reed fixed mounting is on card reed mount pad, and formula sensor pencil 5 that rubs off is through the card reed with the pencil constraint, prevents the chaotic winding of pencil.
The friction plate 2 is provided with an accommodating groove or a through hole 1 penetrating through the friction plate 2;
the wear-out type sensor comprises an upper shell 9 and a lower shell 11, wherein a wear degree module mounting seat for fixedly mounting a wear degree module is arranged in the upper shell 9, the wear degree module is fixedly mounted on the wear degree module mounting seat, and the wear degree module is used for collecting the wear degree of the friction plate 2;
a conversion module mounting seat for fixedly mounting a conversion module is arranged in the lower shell 11, and the conversion module is mounted on the conversion module mounting seat; a support ring 12 for supporting on the fixing groove 6 is arranged on the outer surface of the lower shell 11, a thread 13 corresponding to the thread groove 7 or the thread hole is also arranged on the outer surface of the lower shell 11, and the thread 13 is positioned at the lower part of the support ring 12;
and the controller U1 gives an alarm according to the data collected by the wear-off sensor.
In a preferred embodiment of the present invention, the wear degree module includes n wear resistances, i.e., a1 st wear resistance 81, a 2 nd wear resistance 82, a 3 rd wear resistance 83, … …, and an nth wear resistance 86, where n is a positive integer greater than or equal to 1;
a first end of the 1 st wear resistor 81, a first end of the 2 nd wear resistor 82, a first end of the 3 rd wear resistor 83, … … and a first end of the nth wear resistor 86 are respectively connected with a first connecting sheet 92, and a second end of the 1 st wear resistor 81, a second end of the 2 nd wear resistor 82, a second end of the 3 rd wear resistor 83, … … and a second end of the nth wear resistor 86 are respectively connected with a second connecting sheet 96; namely n abrasion resistors are connected in parallel;
the conversion module includes: a first jack of the connecting sheet is connected with a first end of the first resistor 91 and a first end of the second resistor 93 respectively, a second end of the second resistor 93 is connected with a first power supply VCC, a second jack of the connecting sheet is connected with a second end of the first resistor 91 and a first end of the third resistor 95 respectively, a second end of the third resistor 95 is connected with a first end of the fourth resistor 94, and a second end of the fourth resistor 94 is connected with a power supply ground; and the adjusting end of the resistor III 95 is connected with the signal acquisition end PB4 of the controller U1. Preferably, as shown in fig. 7, n is 6, and the resistance values of the 1 st wear resistor 81, the 2 nd wear resistor 82, the 3 rd wear resistor 83, the 4 th wear resistor 84, the 5 th wear resistor 85, and the 6 th wear resistor 86 are all equal; a first end of a1 st wear resistor 81, a first end of a 2 nd wear resistor 82, a first end of a 3 rd wear resistor 83, a first end of a 4 th wear resistor 84, a first end of a 5 th wear resistor 85 and a first end of a 6 th wear resistor 86 are respectively connected with a first end of a first resistor 91 and a first end of a second resistor 93, and a second end of the second resistor 93 is connected with a first power supply VCC; a second end of the 1 st wear resistor 81, a second end of the 2 nd wear resistor 82, a second end of the 3 rd wear resistor 83, a second end of the 4 th wear resistor 84, a second end of the 5 th wear resistor 85 and a second end of the 6 th wear resistor 86 are respectively connected with a second end of the first resistor 91 and a first end of the third resistor 95, a second end of the third resistor 95 is connected with a first end of the fourth resistor 94, and a second end of the fourth resistor 94 is connected with the power ground; the adjusting end of the resistor III 95 is connected with the signal acquisition end PB4 of the controller U1; preferably, the adjusting end of the resistor tri 95 is disposed at the uppermost end or the lowermost end of the resistor tri 95, and the voltage obtained when the adjusting end of the resistor tri 95 is disposed at the uppermost end of the resistor tri 95 is greater than the voltage obtained when the adjusting end of the resistor tri 95 is disposed at the lowermost end of the resistor tri 95.
In a preferred embodiment of the present invention, the upper housing 9 and the lower housing 11 of the wear-off sensor are detachable structures, a first thread adapted to the outer surface of the lower housing 11 is disposed on the inner surface of the upper housing 9, and a second thread is disposed on the outer surface of the lower housing 11; the upper shell 9 and the lower shell 11 are disassembled and assembled through the first threads on the upper shell 9 and the second threads on the lower shell 11;
or a third thread which is matched with the outer surface of the upper shell 9 is arranged on the inner surface of the lower shell 11, and a fourth thread is arranged on the outer surface of the upper shell 9; the upper shell 9 and the lower shell 11 are detached and installed through the fourth thread on the upper shell 9 and the third thread on the lower shell 11.
In a preferred embodiment of the present invention, the power supply module further includes, as shown in fig. 5, a power supply module including: a power output terminal batt is connected with a first end of a switch S2, a second end of the switch S2 is respectively connected with a first end of a fuse F1 and a first end of a resistor R9, a second end of the resistor R9 is connected with an anode of a light emitting diode LED2, a cathode of the light emitting diode LED2 is connected with a power ground, a second end of the fuse F1 is connected with an anode of a diode D2, a cathode of a diode D2 is respectively connected with a cathode of a diode Z1, a first end of a capacitor C16, a first end of a capacitor C17 and a power voltage input terminal + Vin of a voltage chip U2, and an anode of the diode Z1, a second end of the capacitor C16 and a second end of the capacitor C17 are respectively connected with a power ground terminal of the voltage chip U2 and a switch terminal ON/OFF of the voltage chip U2;
a power supply voltage OUTPUT end OUTPUT of the voltage chip U2 is respectively connected to a first end of an inductor L3 and a cathode of a diode Z2, an anode of the diode Z2 is connected to a power ground, a second end of the inductor L3 is respectively connected to a first end of a capacitor C18 and a FEEDBACK end FEEDBACK of the voltage chip U2, a second end of the inductor L3 OUTPUTs a first power VCC, and a second end of the capacitor C18 is connected to the power ground. In this embodiment, the fuse F1 is a 1A fuse, the resistance of the resistor R9 is 1K, the model of the diode D2 is 1N4007, the model of the diode Z1 is 36CA, the capacitance of the capacitor C16 is 100uF, the capacitance of the capacitor C17 is 0.1uF, the capacitance of the capacitor C18 is 220uF, the inductance of the inductor L3 is 100uH, the model of the diode Z2 is 1N5822, and the model of the voltage chip U2 is LM 2576.
In a preferred embodiment of the present invention, as shown in fig. 10, the sound and light alarm module includes: a bright light driving signal input end IN2 of the driving chip U3 is connected with a bright light driving signal output end PB1 of the controller U1, an acoustic driving signal input end IN3 of the driving chip U3 is connected with an acoustic driving signal output end PB2 of the controller U1, and a common end COM1 of the driving chip U3 is connected with a power ground;
the bright light driving output end OUT2 of the driving chip U3 is connected with the first end of an input loop of the relay D5, the second end of the input loop of the relay D5 is connected with a +5V power supply, the first end of a normally open contact of the relay D5 is connected with a +12V power supply, the second end of the normally open contact of the relay D5 is connected with the first end of a bright light alarm LAMP LAMP, and the second end of the bright light alarm LAMP LAMP is connected with the power supply ground;
the acoustic driving output end OUT3 of the driving chip U3 is connected with the first end of an input loop of the relay D6, the second end of the input loop of the relay D6 is connected with a +5V power supply, the first end of a normally open contact of the relay D6 is connected with a +12V power supply, the second end of the normally open contact of the relay D6 is connected with the first end of an acoustic alarm SPEAKER, and the second end of the acoustic alarm SPEAKER is connected with a power ground. In this embodiment, the driver chip U3 has a model number ULN 2003. The driving signal input end IN1 of the driving chip U3 is connected with the driving signal output end PB0 of the controller U1, the driving output end OUT1 of the driving chip U3 is connected with the first end of the input loop of the relay J2, the second end of the input loop of the relay J2 is connected with a +5V power supply, the first end of a normally open contact of the relay J2 is connected with a +12V power supply, the second end of the normally open contact of the relay D6 is connected with the brake inertia test bed simulation brake lining wear working condition verification rack, and whether the brake inertia test bed simulation brake lining wear working condition verification rack works or not is achieved.
The invention also discloses a testing device for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia bench, and the testing system for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia bench, which is disclosed by any one of claims 1 to 5, is arranged on the brake inertia bench simulation brake lining wear condition verification bench.
The invention also discloses a test method for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia rack, which comprises the following steps:
s1, verifying the installation work of the test system of the alarm function of the wear-off type brake lining wear alarm device by using an inertia rack:
s11, sequentially passing the grinding-off type sensor wire harness 5 through the fixing groove 6 and the threaded hole, or sequentially passing through the fixing groove 6, the threaded groove 7 and the through hole 8; connecting the wear-off sensor wire harness 5 with a controller U1;
s12, screwing the lower shell 11 into the threaded hole or the threaded groove 7 to support the support ring 12 in the fixing groove 6;
s13, inserting the first connecting piece 92 into the first connecting piece jack, inserting the second connecting piece 96 into the second connecting piece jack, and connecting and mounting the first connecting piece with a second thread on the lower shell 11 through a first thread on the upper shell 9, or connecting and mounting the fourth connecting piece with a third thread on the lower shell 11 through a fourth thread on the upper shell 9;
s14, fixedly mounting the friction plate 2 on the brake shoe 3, and enabling the upper shell 9 to be positioned in the accommodating groove or the through hole 1;
s2, installing the test system for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia stand as claimed in any one of claims 1 to 5 on a simulation brake lining wear condition verification stand of a brake inertia test stand;
and S3, testing.
In a preferred embodiment of the invention, the testing comprises:
s31, test preparation:
s311, calculating the rotation speed of the main shaft of the test bed
The rotating speed of a main shaft of the brake inertia test bed and the vehicle speed are converted according to the following relation:
n＝2.65v/r，
wherein n represents the rotation speed of the main shaft of the brake inertia test bed and has the unit r/min;
v represents the test vehicle speed in km/h;
r represents the rolling radius of the wheel in m;
s312, calculating the experimental rotational inertia
The experimental moment of inertia is calculated as follows:
I＝Gmr2，
wherein I represents a calculated value of the moment of inertia in kg.m2；
GmThe maximum design total mass of the automobile is distributed to the part of the mass born by the wheel corresponding to the tested brake according to the brake force distribution ratio design value, wherein the unit is kg;
r represents the rolling radius of the wheel in m;
s313, cutting and processing the brake lining
In order to save unnecessary 'wearing time', a machining mode is utilized to simulate the wearing working condition of the brake lining in the braking process, the thickness of the brake lining is cut, and the cutting is stopped when the cutting thickness is that 'the distance between the surface of a wearing head and the surface of the brake lining is 2-3 mm';
s32, specification of test conditions
S321, running-in test
(a) The initial braking speed is 50 km/h;
(b) the test cooling air speed is 11m/s, and the temperature of the cooling air is room temperature;
(c) the pressure of the brake pipeline is adjusted to ensure that the brake deceleration reaches 3.0m/s2Braking from the initial braking speed to the final speed of zero;
(d) the braking interval time is determined by controlling the initial temperature of the brake not to exceed 120 ℃;
(e) the running-in times are determined so that the contact area between the brake lining and the brake drum reaches more than 80 percent;
s322, benchmark test
(a) The initial braking temperature is 80 +/-2 ℃;
(b) the initial braking speed is 30 km/h;
(c) the braking deceleration is 3.0m/s2；
(d) The number of tests was 3.
S323, wear alarm function verification test
(a) The initial braking speed is 80 km/h;
(b) performing a test in a constant input mode, wherein the pressure of a brake pipeline is the same as that of a reference test, and braking is performed from an initial braking speed to a final speed of zero;
(c) the final brake temperature is less than or equal to 350 ℃;
(d) the test cooling air speed is 11m/s, and the temperature of the cooling air is room temperature;
(e) the function verification test frequency is determined by that the abrasion amount of the brake lining reaches the abrasion limit to trigger an alarm device to trigger an alarm signal.
In a preferred embodiment of the invention, the testing comprises:
and (3) calculating the abrasion degree of the friction plate 2 in real time:
when the abrasion degree of the friction plate 2 is greater than or equal to a preset first abrasion degree threshold value, an audible and visual alarm is given;
when the abrasion degree of the friction plate 2 is larger than or equal to a preset second abrasion degree threshold value, and the preset second abrasion degree threshold value is larger than a preset first abrasion degree threshold value, an audible and visual alarm is sent out, and the brake inertia test bed is controlled to stop working.
In a preferred embodiment of the present invention, the method for calculating the degree of wear of the friction plate 2 includes:
s41, calculating an initial voltage acquisition value:
s411, initial resistance value R of abrasion degree module0：
Figure BDA0002696782220000161
Figure BDA0002696782220000162
Figure BDA0002696782220000163
Figure BDA0002696782220000164
Figure BDA0002696782220000165
Wherein R is0Representing an initial resistance value of the wear module;
R1represents the resistance value of the 1 st wear resistance 81;
R2represents the resistance value of the 2 nd wear resistance 82;
R3a resistance value representing the 3 rd wearing resistance 83;
R4a resistance value representing a 4 th wear resistance;
Rn-1a resistance value representing an n-1 th wear resistance;
Rnelectricity representing the n-th wearing resistance 86Resistance value;
s412, determining whether the error value Q is within a preset error range:
Figure BDA0002696782220000166
wherein Q represents an error value;
V0representing the resistance value collected at the beginning;
VCCrepresents a first power supply VCC;
r1represents the resistance value of the first resistor 91;
r2the resistance value of the second resistor 93 is shown;
r3represents the resistance value of the resistor three 95;
r3' denotes the tuning resistance value;
r4a resistance value representing a resistance of four 94;
if the error value Q is within the preset error range, starting the test;
if the error value Q is not within the preset error range, replacing the grinding-off type sensor, and judging whether the error value Q is within the preset error range again;
s42, calculating the resistance R at the time tt：
Figure BDA0002696782220000171
Wherein, VtThe voltage value collected by the controller U1 at the moment t is represented;
Rtrepresents the resistance value at time t;
s43, calculating the wear number p-1 at the time t:
Figure BDA0002696782220000172
Figure BDA0002696782220000173
Figure BDA0002696782220000174
Figure BDA0002696782220000175
Figure BDA0002696782220000176
wherein p is 1,2,3, …, n;
s44, judging the size between the abrasion number p-1 and the preset first abrasion number threshold value and the preset second abrasion number threshold value:
if the abrasion number p-1 is greater than or equal to a preset first abrasion number threshold value, namely the abrasion degree of the friction plate 2 is greater than or equal to a preset first abrasion degree threshold value, an audible and visual alarm is sent out;
and if the abrasion number p-1 is greater than or equal to a preset second abrasion number threshold value, and the preset second abrasion number threshold value is greater than a preset first abrasion number threshold value, sending out an audible and visual alarm and controlling the brake inertia test bed to stop working.
In the present embodiment, as shown in fig. 11, the crystal oscillator module includes: a crystal oscillator end EXTAL of the controller U1 is respectively connected with a first end of a resistor R6, a first end of a crystal oscillator Y1 and a first end of a capacitor C12, a crystal oscillator end XTAL of the controller U1 is respectively connected with a second end of a resistor R6, a second end of a crystal oscillator Y1 and a first end of a capacitor C13, and a second end of the capacitor C12 and a second end of the capacitor C13 are respectively connected with a power ground;
as shown in fig. 9, the reset module includes: a first end of the RESET switch S1 is respectively connected with a power ground and a first end of the capacitor C15, a second end of the capacitor C15 and a second end of the RESET switch S1 are respectively connected with a first end of the resistor R8 and a RESET input end RESET of the controller U1, and a second end of the resistor R8 is connected with a first power VCC;
still include background debugging module: the debugging end of background debugging interface JP1 links to each other with the first end of resistance R7 and the debugging end MODC/BKGD of controller U1 respectively, background debugging interface JP1 links to each other with the debugging chip, the second end of resistance R7 links to each other with first power VCC, the power end of background debugging interface JP1 links to each other with first power VCC, the power ground terminal of background debugging interface JP1 links to each other with power ground, the reset end of background debugging interface JP1 links to each other with reset switch S1' S second end.
Further comprising: a power supply filter terminal VDDX1 of the controller U1 is respectively connected with a first terminal of a capacitor C2, a first terminal of a capacitor C3, a first terminal of a capacitor C4 and a first terminal of an inductor L1, and a power supply filter ground terminal VSSX1 of the controller U1 is respectively connected with a second terminal of the capacitor C2, a second terminal of a capacitor C3, a second terminal of the capacitor C4 and a power supply ground; a second end of the inductor L1 is connected to a first power supply VCC;
a voltage-regulating power supply terminal VDDF of the controller U1 is connected with a first terminal of a capacitor C1, and a voltage-regulating power supply ground terminal VSS1 of the controller U1 is respectively connected with a second terminal of the capacitor C1 and a power supply ground;
a work indication terminal PK4 of the controller U1 is connected with a first terminal of a resistor R1, a second terminal of the resistor R1 is connected with a negative electrode of a work indicator LED1, and a positive electrode of the work indicator LED1 is connected with a first power supply VCC;
a register terminal XCLKS/ECLKX2/PE7 of the controller U1 is connected with a first terminal of a resistor R2, a register terminal PE6 of the controller U1 is connected with a first terminal of a resistor R3, a register terminal PE5 of the controller U1 is connected with a first terminal of a resistor R4, and a second terminal of the resistor R2, a second terminal of the resistor R3 and a second terminal of the resistor R4 are respectively connected with a power ground;
the register terminal ECLK/PE4 of the controller U1 is connected with a first terminal of a resistor R5, and a second terminal of the resistor R5 is connected with a first power supply VCC;
a power supply filter terminal VDDX2 of the controller U1 is respectively connected with a first power supply VCC and a first terminal of a capacitor C10, and a power supply filter ground terminal VSSX2 of the controller U1 is respectively connected with a second terminal of a capacitor C10 and a power supply ground;
a power supply filter terminal VDDR of the controller U1 is respectively connected with a first power supply VCC and a first terminal of a capacitor C11, and a power supply filter ground terminal VSSX2 of the controller U1 is respectively connected with a second terminal of the capacitor C11, a power supply ground and a voltage stabilization ground terminal VSSPLL of the controller U1; a voltage stabilizing terminal VDDPLL of the controller U1 is connected with a first terminal of a capacitor C14, and a second terminal of a capacitor C14 is connected with the power ground;
a power supply filter terminal VDD of the controller U1 is connected with a first terminal of the capacitor C9, and a power supply filter ground terminal VSS2 of the controller U1 is respectively connected with a second terminal of the capacitor C11 and a power supply ground;
an analog-to-digital conversion voltage reference terminal VDDA1 of the controller U1 is respectively connected with a first terminal of a capacitor C6, a first terminal of a capacitor C7, a first terminal of a capacitor C8 and a first terminal of an inductor L2, a second terminal of a capacitor C6, a second terminal of a capacitor C7 and a second terminal of the capacitor C8 are respectively connected with a power ground, and a second terminal of an inductor L2 is connected with a first power VCC;
an analog-to-digital conversion voltage reference ground terminal VSSA1 of the controller U1, an analog-to-digital conversion voltage reference terminal VRL of the controller U1 and a first terminal of a capacitor C5 are respectively connected with a power ground, and an analog-to-digital conversion voltage reference terminal VRH of the controller U1 is respectively connected with a first power VCC and a second terminal of a capacitor C5;
the model of the controller U1 is MC9S12XS128MAL, the resistance values of the resistor R7 and the resistor R8 are 10K, and the capacitance values of the capacitor C16, the capacitor C2, the capacitor C5, the capacitor C6, the capacitor C10 and the capacitor C11 are 0.1 uF; inductance values of an inductor L1 and an inductor L2 are 10uH, capacitance values of a capacitor C3 and a capacitor C7 are 0.01uF, capacitance values of a capacitor C4 and a capacitor C8 are 10uF, capacitance value of a capacitor C1 is 220uF, resistance value of a resistor R1 is 1K, resistance values of a resistor R2, a resistor R3, a resistor R4 and a resistor R5 are 10K, resistance value of a resistor R6 is 10M, capacitance values of a capacitor C12 and a capacitor C13 are 20pF, capacitance values of a capacitor C9 and a capacitor C14 are 220nF,
as shown in fig. 3, after the testing system for verifying the alarm function of the wear-out type brake lining wear alarm device by using the inertia stand is installed on the brake inertia stand simulation brake lining wear condition verification stand, the method comprises the following steps: the rotating end (i.e. the brake disc) of the air disc brake assembly 20 is connected to a motor 24 through an intermediate support 21 and a transmission shaft 23, wherein the motor is used for simulating the rotating speed of a wheel, and the flywheel disc 22 is used for simulating the load borne by the air disc brake assembly; the fixed end (namely the air pressure caliper) of the air pressure disc brake assembly is connected to a tailstock 18 of the inertia test bench, and a force arm 19 on the tailstock is connected with a force sensor 25; in the braking process, the braking force generated by the air disc brake assembly is transmitted to the force sensor through the force arm, and the product of the test value of the force sensor and the force arm in the test is the braking torque T; the air disc brake assembly 20 is located within the brake installation compartment.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A test system for verifying the alarm function of a wear-off type brake lining alarm device by using an inertia rack comprises a brake shoe and a friction plate arranged on the surface of the brake shoe, and is characterized in that a fixed groove is formed in the brake shoe, a thread groove or a thread hole penetrating through the brake shoe is formed in the bottom of the fixed groove, the size of the thread groove or the size of the thread hole is smaller than that of the fixed groove, and a through hole for a wear-off type sensor wire harness to penetrate through is formed in the bottom of the thread groove; the broken sensor wire harness is connected with the controller U1;
the friction plate is provided with an accommodating groove or a through hole penetrating through the friction plate;
the wear-off type sensor comprises an upper shell and a lower shell, wherein a wear degree module mounting seat for fixedly mounting a wear degree module is arranged in the upper shell, the wear degree module is fixedly mounted on the wear degree module mounting seat, and the wear degree module is used for collecting the wear degree of a friction plate;
the abrasion degree module comprises n abrasion resistors which are respectively a1 st abrasion resistor, a 2 nd abrasion resistor, a 3 rd abrasion resistor, … … and an nth abrasion resistor, wherein n is a positive integer greater than 1;
the first end of the 1 st abrasion resistor, the first end of the 2 nd abrasion resistor, the first end of the 3 rd abrasion resistor, … … and the first end of the nth abrasion resistor are respectively connected with the first connecting piece, and the second end of the 1 st abrasion resistor, the second end of the 2 nd abrasion resistor, the second end of the 3 rd abrasion resistor, … … and the second end of the nth abrasion resistor are respectively connected with the second connecting piece; namely n abrasion resistors are connected in parallel;
a conversion module mounting seat for fixedly mounting a conversion module is arranged in the lower shell, and the conversion module is mounted on the conversion module mounting seat; the outer surface of the lower shell is provided with a support ring used for supporting on the fixing groove, the outer surface of the lower shell is also provided with a thread matched with the thread groove or the thread hole, and the thread is positioned at the lower part of the support ring;
and the controller U1 gives an alarm according to the data collected by the wear-off sensor.
2. The test system for verifying the warning function of a wear-off brake lining wear warning device using an inertia stand as set forth in claim 1, wherein the conversion module comprises: a first jack of the connecting sheet is connected with a first end of the first resistor and a first end of the second resistor respectively, a second end of the second resistor is connected with a first power supply VCC, a second jack of the connecting sheet is connected with a second end of the first resistor and a first end of the third resistor respectively, a second end of the third resistor is connected with a first end of the fourth resistor, and a second end of the fourth resistor is connected with a power supply ground; and the adjusting end of the resistor III is connected with the signal acquisition end PB4 of the controller U1.
3. The system for testing the alarm function of a wear-off type brake lining wear alarm device by using an inertia rack as claimed in claim 1, wherein the upper shell and the lower shell of the wear-off type sensor are detachable structures, a first thread adapted to the outer surface of the lower shell is arranged on the inner surface of the upper shell, and a second thread is arranged on the outer surface of the lower shell; the upper shell and the lower shell are disassembled and assembled through the first threads on the upper shell and the second threads on the lower shell;
or a third thread which is matched with the outer surface of the upper shell is arranged on the inner surface of the lower shell, and a fourth thread is arranged on the outer surface of the upper shell; the upper shell and the lower shell are disassembled and assembled through the fourth threads on the upper shell and the third threads on the lower shell.
4. The test system for verifying the warning function of a wear-off brake lining wear warning device using an inertia stand as set forth in claim 1, further comprising a power module, the power module comprising: a power output terminal batt is connected with a first end of a switch S2, a second end of the switch S2 is respectively connected with a first end of a fuse F1 and a first end of a resistor R9, a second end of the resistor R9 is connected with an anode of a light emitting diode LED2, a cathode of the light emitting diode LED2 is connected with a power ground, a second end of the fuse F1 is connected with an anode of a diode D2, a cathode of a diode D2 is respectively connected with a cathode of a diode Z1, a first end of a capacitor C16, a first end of a capacitor C17 and a power voltage input terminal + Vin of a voltage chip U2, and an anode of the diode Z1, a second end of the capacitor C16 and a second end of the capacitor C17 are respectively connected with a power ground terminal of the voltage chip U2 and a switch terminal ON/OFF of the voltage chip U2;
a power supply voltage OUTPUT end OUTPUT of the voltage chip U2 is respectively connected to a first end of an inductor L3 and a cathode of a diode Z2, an anode of the diode Z2 is connected to a power ground, a second end of the inductor L3 is respectively connected to a first end of a capacitor C18 and a FEEDBACK end FEEDBACK of the voltage chip U2, a second end of the inductor L3 OUTPUTs a first power VCC, and a second end of the capacitor C18 is connected to the power ground.
5. The test system for verifying the alarm function of a wear-off brake lining wear alarm device by using an inertia stand as claimed in claim 1, wherein the audible and visual alarm module comprises: a bright light driving signal input end IN2 of the driving chip U3 is connected with a bright light driving signal output end PB1 of the controller U1, an acoustic driving signal input end IN3 of the driving chip U3 is connected with an acoustic driving signal output end PB2 of the controller U1, and a common end COM1 of the driving chip U3 is connected with a power ground;
the bright light driving output end OUT2 of the driving chip U3 is connected with the first end of an input loop of the relay D5, the second end of the input loop of the relay D5 is connected with a +5V power supply, the first end of a normally open contact of the relay D5 is connected with a +12V power supply, the second end of the normally open contact of the relay D5 is connected with the first end of a bright light alarm LAMP LAMP, and the second end of the bright light alarm LAMP LAMP is connected with the power supply ground;
the acoustic driving output end OUT3 of the driving chip U3 is connected with the first end of an input loop of the relay D6, the second end of the input loop of the relay D6 is connected with a +5V power supply, the first end of a normally open contact of the relay D6 is connected with a +12V power supply, the second end of the normally open contact of the relay D6 is connected with the first end of an acoustic alarm SPEAKER, and the second end of the acoustic alarm SPEAKER is connected with a power ground.
6. A test device for verifying the alarm function of a wear-off type brake lining wear alarm device by using an inertia bench, which is characterized in that the test system for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia bench as claimed in any one of claims 1 to 5 is installed on a brake inertia bench simulation brake lining wear condition verification bench.
7. A test method for verifying the alarm function of a wear-off type brake lining wear alarm device by using an inertia rack is characterized by comprising the following steps of:
s1, verifying the installation work of the test system of the alarm function of the wear-off type brake lining wear alarm device by using an inertia rack:
s11, sequentially passing the broken sensor wire harness through the fixing groove and the threaded hole in sequence, or sequentially passing the broken sensor wire harness through the fixing groove, the threaded groove and the through hole in sequence; connecting the wear-off sensor wire harness with a controller U1;
s12, screwing the lower shell into the threaded hole or the threaded groove to enable the support ring to be supported in the fixing groove;
s13, inserting the first connecting piece into the first connecting piece inserting hole, inserting the second connecting piece into the second connecting piece inserting hole, and connecting and installing the first connecting piece and the second connecting piece through a first thread on the upper shell and a second thread on the lower shell, or connecting and installing the first connecting piece and the second connecting piece through a fourth thread on the upper shell and a third thread on the lower shell;
s14, fixedly mounting the friction plate on the brake shoe, and enabling the upper shell to be positioned in the accommodating groove or the through hole;
s2, installing the test system for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia stand as claimed in any one of claims 1 to 5 on a simulation brake lining wear condition verification stand of a brake inertia test stand;
and S3, testing.
8. The test method for verifying the warning function of a wear-off brake lining wear warning device using an inertia stand according to claim 7, wherein the test comprises:
s31, test preparation:
s311, calculating the rotation speed of the main shaft of the test bed
The rotating speed of a main shaft of the brake inertia test bed and the vehicle speed are converted according to the following relation:
n＝2.65v/r，
wherein n represents the rotation speed of the main shaft of the brake inertia test bed and has the unit r/min;
v represents the test vehicle speed in km/h;
r represents the rolling radius of the wheel in m;
s312, calculating the experimental rotational inertia
The experimental moment of inertia is calculated as follows:
I＝Gmr2，
wherein I represents a calculated value of the moment of inertia in kg.m2；
GmThe maximum design total mass of the automobile is distributed to the part of the mass born by the wheel corresponding to the tested brake according to the brake force distribution ratio design value, wherein the unit is kg;
r represents the rolling radius of the wheel in m;
s313, cutting and processing the brake lining
In order to save unnecessary 'wearing time', a machining mode is utilized to simulate the wearing working condition of the brake lining in the braking process, the thickness of the brake lining is cut, and the cutting is stopped when the cutting thickness is that 'the distance between the surface of a wearing head and the surface of the brake lining is 2-3 mm';
s32, specification of test conditions
S321, running-in test
(a) The initial braking speed is 50 km/h;
(b) the test cooling air speed is 11m/s, and the temperature of the cooling air is room temperature;
(c) the pressure of the brake pipeline is adjusted to ensure that the brake deceleration reaches 3.0m/s2Braking from the initial braking speed to the final speed of zero;
(d) the braking interval time is determined by controlling the initial temperature of the brake not to exceed 120 ℃;
(e) the running-in times are determined so that the contact area between the brake lining and the brake drum reaches more than 80 percent;
s322, benchmark test
(a) The initial braking temperature is 80 +/-2 ℃;
(b) the initial braking speed is 30 km/h;
(c) the braking deceleration is 3.0m/s2；
(d) The test times are 3 times;
s323, wear alarm function verification test
(a) The initial braking speed is 80 km/h;
(b) performing a test in a constant input mode, wherein the pressure of a brake pipeline is the same as that of a reference test, and braking is performed from an initial braking speed to a final speed of zero;
(c) the final brake temperature is less than or equal to 350 ℃;
(d) the test cooling air speed is 11m/s, and the temperature of the cooling air is room temperature;
(e) the function verification test frequency is determined by that the abrasion amount of the brake lining reaches the abrasion limit to trigger an alarm device to trigger an alarm signal.
9. The test method for verifying the warning function of a wear-off brake lining wear warning device using an inertia stand according to claim 7, wherein the test comprises:
calculating the abrasion degree of the friction plate in real time:
when the abrasion degree of the friction plate is greater than or equal to a preset first abrasion degree threshold value, an audible and visual alarm is given;
when the abrasion degree of the friction plate is larger than or equal to a preset second abrasion degree threshold value, and the preset second abrasion degree threshold value is larger than a preset first abrasion degree threshold value, an audible and visual alarm is sent out, and the brake inertia test bed is controlled to stop working.
10. The test method for verifying the alarm function of the wear-off type brake lining wear alarm device by using the inertia stand as set forth in claim 9, wherein the degree of wear of the friction plate is calculated by:
s41, calculating an initial voltage acquisition value:
s411, initial resistance value R of abrasion degree module0：
Figure FDA0003090769830000061
Wherein R is0Representing an initial resistance value of the wear module;
R1a resistance value representing a1 st wear resistance;
R2a resistance value representing a 2 nd wear resistance;
R3a resistance value representing a 3 rd wear resistance;
R4a resistance value representing a 4 th wear resistance;
Rn-1a resistance value representing an n-1 th wear resistance;
Rna resistance value representing an nth wear resistance;
s412, determining whether the error value Q is within a preset error range:
Figure FDA0003090769830000071
wherein Q represents an error value;
V0representing the resistance value collected at the beginning;
VCCrepresents a first power supply VCC;
r1a resistance value representing a first resistance;
r2a resistance value representing a second resistance;
r3a resistance value representing a resistance three;
r3' indicating toneThe resistance value is saved;
r4a resistance value representing a resistance four;
if the error value Q is within the preset error range, starting the test;
if the error value Q is not within the preset error range, replacing the grinding-off type sensor, and judging whether the error value Q is within the preset error range again;
s42, calculating the resistance R at the time tt：
Figure FDA0003090769830000072
Wherein, VtThe voltage value collected by the controller U1 at the moment t is represented;
Rtrepresents the resistance value at time t;
s43, calculating the wear number p-1 at the time t:
Figure FDA0003090769830000081
wherein p is 1,2,3, …, n;
s44, judging the size between the abrasion number p-1 and the preset first abrasion number threshold value and the preset second abrasion number threshold value:
if the abrasion number p-1 is greater than or equal to a preset first abrasion number threshold value, namely the abrasion degree of the friction plate is greater than or equal to a preset first abrasion degree threshold value, an audible and visual alarm is sent out;
and if the abrasion number p-1 is greater than or equal to a preset second abrasion number threshold value, and the preset second abrasion number threshold value is greater than a preset first abrasion number threshold value, sending out an audible and visual alarm and controlling the brake inertia test bed to stop working.
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