CN102998482A - Measuring method for errors of rotating speed sensor - Google Patents

Measuring method for errors of rotating speed sensor Download PDF

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CN102998482A
CN102998482A CN2012105122383A CN201210512238A CN102998482A CN 102998482 A CN102998482 A CN 102998482A CN 2012105122383 A CN2012105122383 A CN 2012105122383A CN 201210512238 A CN201210512238 A CN 201210512238A CN 102998482 A CN102998482 A CN 102998482A
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rotating speed
edge
negative edge
signal
phase
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CN102998482B (en
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丁俊东
陆娟
杨明
王奇
施华传
李文文
沈妍
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FAW Group Corp
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Wuxi Fuel Pump and Nozzle Research Institute of China FAW Corp
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Abstract

The invention provides a measuring method for errors of a rotating speed sensor. The measuring method comprises a first step of measuring sensor delay time T1 and a second step of measuring transmission delay time T2. In the first step, the total edge number of A-phase rising edges, B-phase rising edges and falling edges between falling edges of Z-phase single pulse signals corresponding to different rotating speeds and falling edges of first crankshaft tooth signals is measured, and the corresponding sensor delay time T1 of the rotating speed sensor at one or a plurality of middle test rotating speeds and the highest test rotating speed is calculated. In the second step, signals are collected through the signal output end of the rotating speed sensor 3 and the central processing unit (CPU) crankshaft signal input end of an engine respectively, and transmission delay of the signals is judged according to time difference of two collected signals. The measuring method is used for measuring the errors of the rotating speed sensor.

Description

The measuring method of speed probe error
Technical field
The present invention relates to a kind of measuring method of sensor error, especially a kind of measuring method of speed probe error.
Background technology
Crankshaft sensor (namely herein speed probe) is one of topmost sensor in the engine electric-controlled system, and for detection of piston top dead center, crank angle and engine speed provide oil spout constantly to ECU.Accurately oil spout constantly and discharging economical on engine fuel has important impact.Along with electric-controlled co-rail system development and application further deeply, the accuracy requirement of crankshaft signal is also being improved constantly.This just requires crankshaft sensor that accurate crank position is provided.The disclosed target wheel position detection systems of Chinese patent CN10716929A, this system is provided for accurately learning the technology of the space width of tooth opinion, the permission system is for closely-spaced accurate Calculation positional information, remedy the error that causes owing to variation between manufacturing tolerance, part, gear sensor and gear sensor system change, but can't prototype gear sensor self and the fixed delay error that produces of whole signal transmission system, cause gear physical location and sensor output signal to have error.
Summary of the invention
The invention provides a kind of measuring method of speed probe error, can Measurement accuracy speed probe self error (sensor delay), and engine wiring harness and hardware circuit signal are processed error (transmission delay) between gear physical location that the signal delay that produces causes and the signals of rotational speed sensor.The technical solution used in the present invention is:
A kind of measuring method of speed probe error comprises following two large steps:
Step 1: the measurement of sensor delay time T 1;
Described step 1 comprises:
Step 101, use driving arrangement to drive the rotation of bent axle fluted disc and reach initial test rotating speed, read the negative edge of Z phase single pulse signal corresponding to initial test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 102, using driving arrangement to drive the bent axle fluted disc rotates, progressively improve the test rotating speed, on the one or more middle test rotating speed between initial test rotating speed and the highest test rotating speed, the negative edge of the Z phase single pulse signal that the test rotating speed is corresponding in the middle of the test PC is read arrives total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal; All repeatedly duplicate measurementss on test rotating speed in the middle of each are averaged;
Step 103, use driving arrangement to drive the rotation of bent axle fluted disc and reach the highest test rotating speed, read the negative edge of Z phase single pulse signal corresponding to the highest test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 104, arrive total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal according to the negative edge of the Z phase single pulse signal that test rotating speed or the highest test rotating speed are corresponding in the middle of the above-mentioned measurement, and the negative edge of Z phase single pulse signal corresponding to initial test rotating speed is to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal, calculates speed probe corresponding sensor delay time T 1 when test rotating speeds and the highest test rotating speed in the middle of one or more;
Step 2, the measurement of propagation delay time T2;
Described step 2 comprises:
Step 201 respectively from the signal output part of speed probe and the CPU crankshaft signal input end collection signal of engine, according to the mistiming of two signals that collect, is judged the transmission delay of signal;
Step 202, the rotating speed of adjustment bent axle fluted disc, repeating step 201, the mistiming of two signals of the signal output part of measurement speed probe and the CPU crankshaft signal input end of engine.The mistiming of two signals of the CPU crankshaft signal input end of the signal output part of described speed probe and engine is consistent in repeatedly measuring, and is propagation delay time T2.
Further, in the described step 1, the test PC is installed NI DAQ Survey Software, uses NI DAQ Survey Software to finish the negative edge of Z phase single pulse signal to the measurement of total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal.
Advantage of the present invention: the present invention can measure the error of speed probe under the different rotating speeds accurately, and then can remedy in actual applications the error that the speed probe system causes, thereby determine that accurately oil spout constantly, the cylinder intermediate fuel oil is fully burnt, both fuel savings can reduce again the tail gas pollution of vehicular discharge.
Description of drawings
Fig. 1 is bent axle fluted disc of the present invention, scrambler, speed probe scheme of installation.
Fig. 2 is Z, A, the B phase signals figure of crank teeth signal of the present invention and scrambler.
Fig. 3 is the edge measuring method figure of DAQ pulse of the present invention.
Fig. 4 is the same or processing synoptic diagram of the pulse signal of A of the present invention, B phase.
Fig. 5 is that distribution plan is counted at total edge of A under the different rotating speeds of the present invention, B two-phase rising edge and negative edge.
Embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
A kind of measuring method of speed probe error before measuring, need to be installed first the speed probe error measuring system, comprises bent axle fluted disc 1, scrambler 2, speed probe 3 are installed capture card, test PC; Speed probe 3 is fixed with the position of bent axle fluted disc 1; Scrambler 2 and 1 coaxial connection of bent axle fluted disc; Capture card is installed on the test PC;
The A phase of scrambler 2, B phase revolution are exported respectively the pulse signal of identical fixed qty (this example is 3600), Z phase revolution output individual pulse signal; The Z phase pulse signal of scrambler 2 outputs to the AUX end of each counter on the capture card; The pulse signal of the A of scrambler 2, B phase through with or process, produce the identical or afterpulse signal of A, B, and output to the SOURCE end of each counter on the capture card; The crank teeth signal of speed probe 3 outputs outputs to the GATE end of each counter on the capture card.
A kind of measuring method of speed probe error comprises following two large steps:
Step 1: the measurement of sensor delay time T 1;
Described step 1 comprises:
Step 101, use driving arrangement to drive 1 rotation of bent axle fluted disc and reach initial test rotating speed, read the negative edge of Z phase single pulse signal corresponding to initial test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 102, using driving arrangement to drive bent axle fluted disc 1 rotates, progressively improve the test rotating speed, on the one or more middle test rotating speed between initial test rotating speed and the highest test rotating speed, the negative edge of the Z phase single pulse signal that the test rotating speed is corresponding in the middle of the test PC is read arrives total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal; All repeatedly duplicate measurementss on test rotating speed in the middle of each are averaged;
Step 103, use driving arrangement to drive 1 rotation of bent axle fluted disc and reach the highest test rotating speed, read the negative edge of Z phase single pulse signal corresponding to the highest test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 104, arrive total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal according to the negative edge of the Z phase single pulse signal that test rotating speed or the highest test rotating speed are corresponding in the middle of the above-mentioned measurement, and the negative edge of Z phase single pulse signal corresponding to initial test rotating speed is to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal, calculates speed probe 3 corresponding sensor delay time T 1 when test rotating speeds and the highest test rotating speed in the middle of one or more;
Step 2, the measurement of propagation delay time T2;
Described step 2 comprises:
Step 201 respectively from the signal output part of speed probe 3 and the CPU crankshaft signal input end collection signal of engine, according to the mistiming of two signals that collect, is judged the transmission delay of signal;
Step 202, the rotating speed of adjustment bent axle fluted disc 1, repeating step 201, the mistiming of two signals of the signal output part of measurement speed probe 3 and the CPU crankshaft signal input end of engine; The mistiming of two signals of the CPU crankshaft signal input end of the signal output part of described speed probe 3 and engine is consistent in repeatedly measuring, and is propagation delay time T2.
Further, in the described step 1, the test PC is installed NI DAQ Survey Software, uses NI DAQ Survey Software to finish the negative edge of Z phase single pulse signal to the measurement of total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal.
Below be to describe in detail.
As shown in Figure 1, the speed probe error measuring system comprises a bent axle fluted disc 1, a scrambler 2, a speed probe 3.
This measuring system is used dc brushless motor to drive bent axle fluted disc 1 and is rotated, and 0 ~ 1500r/min rotating speed is provided.
Speed probe 3 is fixed in the periphery a distance apart from bent axle fluted disc 1, the changes of magnetic field that the tooth that turns on the measurement bent axle fluted disc 1 causes, and produce crank teeth signal (hereinafter the crank teeth signal is the output signal of speed probe 3).Speed probe 3 can adopt the Hall effect gear sensor, the movement or the rotation that utilize the Hall IC of magnetic bias accurately to measure the class ferrous metal.
Scrambler 2 adopts Omron E6HZ-CWZ6C rotary encoder, with 1 coaxial connection of bent axle fluted disc, can provide A, B, Z three-phase pulse signal, as shown in Figure 2.A phase, B phase revolution are exported respectively 3600 pulse signals, 90 ° of phase differential, Z phase revolution output individual pulse signal.After scrambler 2 installed, the individual pulse signal of Z phase is a certain position of corresponding bent axle fluted disc 1 regularly.
As shown in Figure 2, begin to calculate the umber of pulse of A phase with the negative edge of the Z phase single pulse signal of the revolution of scrambler 2, till the negative edge of first crank teeth signal, observe under the different rotating speeds trigger pip (negative edge of Z phase single pulse signal) to the variation of the number of pulses of A phase between the negative edge of first crank teeth signal, analyze speed probe 3 output signal edges (can take the negative edge of first crank teeth signal as example) and whether change.The A phase of scrambler 2 revolutions or B are 3600 pulse outputs mutually, if the quantity of therefore only adding up an edge (rising edge or negative edge) of A phase or the pulse of B phase, measuring accuracy is 0.1 ° so.In order to improve measuring accuracy, this paper calculates the negative edge of Z phase single pulse signal to A, the rising edge of B two-phase and total edge number of negative edge between the negative edge of first crank teeth signal, and measuring accuracy is brought up to 0.025 °.
The speed probe error measuring system also comprises capture card, test PC, and LabVIEW software platform and the NI DAQ Survey Software of American National instrument company (NI) is installed on the test PC.Capture card is selected the PCI-6221 integrated circuit board of NI company, is installed on the test PC.
As shown in Figure 3, described capture card comprises two counters, and each counter comprises AUX end, GATE end, SOURCE end.If the AUX termination of counter enters the first pulse signal, the GATE termination enters the second pulse signal, the SOURCE termination enters counting clock signal, NI DAQ Survey Software provides a kind of measurement function, and the some edges (rising edge or negative edge) that can measure the first pulse signal begin the pulse number (the perhaps edge number of pulse) to the counting clock signal between first adjacent same edge of the second pulse signal.
Because the PCI-6221 integrated circuit board only has two counters, can't be to four edges (A phase rising edge, negative edge, B phase rising edge, negative edge) count simultaneously, if may have synchronous problem with two integrated circuit boards, therefore, this paper carries out together or processing the pulse square wave of A, B phase first, as shown in Figure 4.The pulse signal of A, B phase through with or process after, the rising of the identical or afterpulse signal of the A of generation, B and total edge number of negative edge namely equal total edge number of A, B two-phase rising edge and negative edge.
In the present embodiment, the AUX termination of each counter enters the Z phase pulse signal of scrambler 2, and the GATE termination enters the crank teeth signal of speed probe 3 outputs, and the SOURCE termination enters the identical or afterpulse signal of A, B of scrambler 2.From the negative edge of Z phase single pulse signal, (be called for short measuring period) till the negative edge of first crank teeth signal, utilize two counters of PCI-6221 integrated circuit board to measure respectively simultaneously A, B identical or the rising edge of afterpulse signal and the number of negative edge, the negative edge that obtains Z phase single pulse signal after the addition begins till the negative edge of first crank teeth signal, total edge number of A, B two-phase rising edge and negative edge.
Below describe the measuring process of speed probe error in detail.
If the tooth edge actual position to bent axle fluted disc 1 is measured, need so to guarantee position, tooth edge and the actual tooth edge position consistency of the fluted disc that records under the different rotating speeds, difficult point is the measurement to tooth edge actual position.The fluted disc rotating speed is high, and measurement space is little, and measuring accuracy requires high.Consider that measurement position, absolute tooth edge difficulty is larger under the high rotating speed, cost is higher, and this paper adopts the measurement of relative position.
The measurement of speed probe error comprises two large steps.
Step 1, the measurement of sensor delay time T 1.As shown in Figure 5, this paper gathers total edge number of trigger pip under the different rotating speeds (negative edge of Z phase single pulse signal) to the A between the negative edge of first crank teeth signal, B two-phase rising edge and negative edge, for rejecting the measuring error of Hall element self, test is carried out under isoperibol, and speed probe 3 is fixed with the distance of bent axle fluted disc 1.The initial test rotating ratio of bent axle fluted disc 1 is lower, and this example is at 20r/min, during initial test rotating speed the delay of speed probe 3 very small, can ignore.Progressively improve rotating speed, bent axle fluted disc 1 is ceaselessly rotating, when the tooth edge arrives, cause the variation of magnetic flux, speed probe 3 need to catch the variation of this magnetic flux and then carry out the signal amplification, and during this period of time, bent axle fluted disc 1 is still rotating, rotating speed is higher, and the differential seat angle at signal and actual tooth edge is larger, and the negative edge of the Z phase single pulse signal that collects also just increases to total edge number of the A between the negative edge of first crank teeth signal, B two-phase rising edge and negative edge.This example is in order to improve measuring accuracy, actual acquisition be that the negative edge of Z phase single pulse signal begins till the negative edge of first crank teeth signal total edge number of A, B two-phase rising edge and negative edge.The initial test rotating speed of this example test is 20r/min, the negative edge of the Z phase single pulse signal that records to total edge number of the A between the negative edge of first crank teeth signal, B two-phase rising edge and negative edge be 52 (for more accurate, repeatedly duplicate measurements is averaged).Progressively improve the test rotating speed, measure respectively in the middle of one or more and test on the rotating speed, in the time of the highest test rotating speed, the negative edge of Z phase single pulse signal is to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal.The highest test rotating speed of this example test is 1500r/min, the negative edge of the Z phase single pulse signal that records to total edge number of the A between the negative edge of first crank teeth signal, B two-phase rising edge and negative edge be 61.5 (for more accurate, repeatedly duplicate measurements is averaged).When the highest test rotating speed, speed probe 3 time delay T1 calculating: namely 25 revolutions per seconds of 1500 rev/mins of the highest test rotating speeds of bent axle fluted disc 1, to send 3600 pulses/turn mutually according to A phase or B, calculate so per second A phase or B and can send mutually 3600*25=90000 pulse, the edge (rising edge adds negative edge) of the identical or afterpulse signal of corresponding 4 A, B of recurrence interval of each A phase or B phase.Per second is the edge of the identical or afterpulse signal of 90000*4=360000 A, B namely.T1=time delay (61.5-52) * (1/360000) the ≈ 26.4us of speed probe 3 during so the highest test rotating speed.In like manner also can calculate T1 time delay of sensor 3 corresponding to each middle test rotating speed.
In sum, step 1 comprises following each substep:
Step 101, use driving arrangement to drive 1 rotation of bent axle fluted disc and reach initial test rotating speed, read the negative edge of Z phase single pulse signal corresponding to initial test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 102, using driving arrangement to drive bent axle fluted disc 1 rotates, progressively improve the test rotating speed, on the one or more middle test rotating speed between initial test rotating speed and the highest test rotating speed, the negative edge of the Z phase single pulse signal that the test rotating speed is corresponding in the middle of the test PC is read arrives total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal; All repeatedly duplicate measurementss on test rotating speed in the middle of each are averaged;
Step 103, use driving arrangement to drive 1 rotation of bent axle fluted disc and reach the highest test rotating speed, read the negative edge of Z phase single pulse signal corresponding to the highest test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 104, arrive total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal according to the negative edge of the Z phase single pulse signal that test rotating speed or the highest test rotating speed are corresponding in the middle of the above-mentioned measurement, and the negative edge of Z phase single pulse signal corresponding to initial test rotating speed is to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal, calculates speed probe 3 corresponding sensor delay time T 1 when test rotating speeds and the highest test rotating speed in the middle of one or more;
Step 2, the measurement of propagation delay time T2.This step need to take multiple measurements in motor car engine.The transmission of Hall element signal is first by the engine linear speed, and ECU (electronic control unit of engine) linear speed passes through the ECU hardware filtering again, and then the CPU that enters engine is to its computing.Because in the signals transmission, bent axle is still in high-speed rotation, therefore, sending gear signal from speed probe 3 collects to CPU and has the hardware delay time the signal, produce deviation so that CPU captures tooth position and the bent axle fluted disc 1 actual tooth position of bent axle fluted disc 1, affect the calculating of injection advance angle.Test result shows that the propagation delay time of speed probe 3 is consistent under bent axle fluted disc 1 different rotating speeds;
Step 2 mainly comprises:
Step 201 respectively from the signal output part of speed probe 3 and the CPU crankshaft signal input end collection signal of engine, according to the mistiming of two signals that collect, is judged the transmission delay of signal;
Step 202, the rotating speed of adjustment bent axle fluted disc 1, repeating step 201, the mistiming of two signals of the signal output part of measurement speed probe 3 and the CPU crankshaft signal input end of engine; The mistiming of two signals of the CPU crankshaft signal input end of the signal output part of described speed probe 3 and engine is consistent in repeatedly measuring, and is propagation delay time T2.
Test result shows, under bent axle fluted disc 1 different rotating speeds propagation delay time of speed probe 3 consistent, be propagation delay time T2.
The speed probe error namely equals sensor delay time T 1 and propagation delay time T2 sum.

Claims (2)

1. the measuring method of a speed probe error is characterized in that, comprises following two large steps:
Step 1: the measurement of sensor delay time T 1;
Described step 1 comprises:
Step 101, use driving arrangement to drive bent axle fluted disc (1) rotation and reach initial test rotating speed, read the negative edge of Z phase single pulse signal corresponding to initial test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 102, using driving arrangement to drive bent axle fluted disc (1) rotates, progressively improve the test rotating speed, on the one or more middle test rotating speed between initial test rotating speed and the highest test rotating speed, the negative edge of the Z phase single pulse signal that the test rotating speed is corresponding in the middle of the test PC is read arrives total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal; All repeatedly duplicate measurementss on test rotating speed in the middle of each are averaged;
Step 103, use driving arrangement to drive bent axle fluted disc (1) rotation and reach the highest test rotating speed, read the negative edge of Z phase single pulse signal corresponding to the highest test rotating speed to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal at the test PC; Repeatedly duplicate measurements is averaged;
Step 104, arrive total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal according to the negative edge of the Z phase single pulse signal that test rotating speed or the highest test rotating speed are corresponding in the middle of the above-mentioned measurement, and the negative edge of Z phase single pulse signal corresponding to initial test rotating speed is to total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal, calculates speed probe (3) corresponding sensor delay time T 1 when test rotating speeds and the highest test rotating speed in the middle of one or more;
Step 2, the measurement of propagation delay time T2;
Described step 2 comprises:
Step 201 respectively from the signal output part of speed probe (3) and the CPU crankshaft signal input end collection signal of engine, according to the mistiming of two signals that collect, is judged the transmission delay of signal;
Step 202, the rotating speed of adjustment bent axle fluted disc (1), repeating step 201, the mistiming of two signals of the signal output part of measurement speed probe (3) and the CPU crankshaft signal input end of engine; The mistiming of two signals of the CPU crankshaft signal input end of the signal output part of described speed probe (3) and engine is consistent in repeatedly measuring, and is propagation delay time T2.
2. the measuring method of speed probe error as claimed in claim 1, it is characterized in that: in the described step 1, the test PC is installed NI DAQ Survey Software, uses NI DAQ Survey Software to finish the negative edge of Z phase single pulse signal to the measurement of total edge number of A, B two-phase rising edge and negative edge between the negative edge of first crank teeth signal.
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CN108139427A (en) * 2015-11-11 2018-06-08 舍弗勒技术股份两合公司 Method for determining a corrected rotational speed signal and electric motor arrangement
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CN104153930A (en) * 2014-08-28 2014-11-19 河南柴油机重工有限责任公司 Timing device for digital igniter of gas fuel internal combustion engine
CN108139427B (en) * 2015-11-11 2020-09-11 舍弗勒技术股份两合公司 Method for determining a corrected rotational speed signal and electric motor arrangement
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CN106934085A (en) * 2015-12-29 2017-07-07 长城汽车股份有限公司 The compensation method of engine crankshaft signals, device and automobile
CN106934085B (en) * 2015-12-29 2021-10-26 长城汽车股份有限公司 Engine crankshaft signal compensation method and device and automobile
CN105737750A (en) * 2016-04-18 2016-07-06 天津理工大学 Method and apparatus for measuring arm span of ship diesel engine based on photoelectric encoder and laser range finding sensor
CN105911555A (en) * 2016-04-18 2016-08-31 天津理工大学 Marine diesel engine arm span difference detection method and device based on photoelectric encoder and laser distance-measuring sensor
CN105911555B (en) * 2016-04-18 2018-05-29 天津理工大学 A kind of boat diesel engine difference crank spread detection method and device based on photoelectric encoder and laser range sensor
CN105737750B (en) * 2016-04-18 2018-05-29 天津理工大学 A kind of marine diesel horn based on photoelectric encoder and laser range sensor is away from value measurement method and device
CN106248997A (en) * 2016-08-22 2016-12-21 沈阳华创风能有限公司 A kind of speed probe test equipment
CN110736489A (en) * 2018-07-18 2020-01-31 大陆汽车电子（连云港）有限公司 Sensor performance testing method and system
CN109612502B (en) * 2018-12-05 2021-02-12 麦歌恩电子(上海)有限公司 Method and system for testing transmission delay of internal signal of magnetic encoder chip
CN109612502A (en) * 2018-12-05 2019-04-12 麦歌恩电子(上海)有限公司 The test method and system of magnetic coder chip interior signal transmission delay
CN112963245A (en) * 2021-03-16 2021-06-15 潍柴动力股份有限公司 Engine speed sensor air gap control device and control method
CN112963245B (en) * 2021-03-16 2021-12-21 潍柴动力股份有限公司 Engine speed sensor air gap control device and control method
CN114324980A (en) * 2022-03-14 2022-04-12 南京中旭电子科技有限公司 Multi-parameter testing method for multi-channel Hall sensor with expansion function
CN114324980B (en) * 2022-03-14 2022-05-24 南京中旭电子科技有限公司 Multi-parameter testing method for multi-channel Hall sensor with expansion function

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