31results about How to "Improve diagnostic coverage" patented technology

A solenoid valve comprises a housing 2 having an axial bore 7 which is in flow connection with at least an inlet port and an outlet port 3, 5, a valve element 8 which is moveable to and fro in the axial direction of the bore 7, an electrical coil 13 for generating a magnetic field for moving the valve element 8 between a first end position, in which it lies sealing against a seat 9′ in order to disconnect said inlet and outlet port 3, 5 from each other, and a second end position, in which it lies at a distance from said seat 9′ in order to create a flow opening for connecting said inlet and outlet port 3, 5 with each other, and a position sensor 17 for detecting axial positions of the valve element 8 in the axial direction of the bore 7. A control unit C is provided for determining stroke, velocities and / or accelerations of the valve element 8 in the axial direction of the bore 7 as a function of the detected axial positions during movements of the valve element 8 between its first and second end positions.

The invention relates to an embedded system power on self test method. The method comprises the following steps: (1), electrifying a system, and detecting a center processing unit (CPU) register; (2), detecting internal memory by a cross blocking method being used, and judging whether breakdowns exist in the internal memory or not; (3), classifying instructions used by the system, testing the various instructions, comparing test results with an expected test result vector quantity, and judging whether all the instructions pass a test, if yes, executing the step (4), if no, carrying out failure process; (4), carrying out read only memory (ROM) integrity detection on operation system files which are loaded, application programs and data, and judging whether the loaded files are integrated or not, if yes, quitting detection, if no, entering error process. Compared with the prior art, the embedded system power on self test method has the advantages of being reliable, effective, and high in fault detect covering rate.

The invention discloses a fault detecting method for a braking device. The fault detecting method is used for comprehensively detecting and diagnosing the action matching reliability of all sectors on a brake shoe and a brake drum. The fault detecting method comprises the steps of sequentially carrying out static detection and dynamic detection on the braking device; during static detection, applying a torque current with a specific direction to a traction machine in a brake closing state, and observing the slip condition of a traction wheel; during dynamic detection, setting the switching sequence of the sectors through a sector management unit, releasing the brake, and driving the traction machine to rotate; and when the traction machine rotates for a certain mechanical angle, stopping the brake, meanwhile, cutting off a power source of the traction machine, and observing the braking- stopping distance of the traction machine from rotating to stopping. The fault condition of the braking device is diagnosed through judging static and dynamic detection results on all the sectors. The fault detecting method is high in diagnosis coverage rate and capable of checking slight abnormality of the braking device, achieving the aim of nipping in blossom and effectively avoiding accidents caused by failure of the braking device.

The invention discloses a safety instrument system based on D-S (Dempster / Shafer) evidence theory. The safety instrument system comprises a sensor, a logic decision system and a performing unit, wherein the logic decision system comprises an input circuit, a processor, an output circuit, and a diagnosis module based on the D-S evidence theory; and the diagnosis module based on the D-S evidence theory is used for improving the reliability of the diagnosis basis through the calculation based on the D-S evidence theory in a multi-channel logical decision system according to the related feedback information among the channels. By adopting the safety instrument system based on the D-S evidence theory, the self-diagnosis function of the system can be realized through fewer hardware devices; and the safety instrument system based on the D-S evidence theory has the advantages of being lower in cost and higher in reliability and safety.

The invention discloses an LVDT sensor signal detection circuit and a detection method thereof. The detection circuit comprises a frequency generation circuit. The frequency generation circuit is connected with an LVDT sensor sequentially through an analog filter circuit and a drive circuit. A secondary coil of the LVDT sensor is connected with an envelope analysis module and a fault judgement module sequentially through an amplitude processing circuit and an A / D conversion module. The detection method comprises the steps that a primary coil outputs sine 0 phase; after delay, the phase of the secondary coil is judged; the duration of 0 phase of the secondary coil is recorded; according to recorded delay data, the secondary coil of the LVDT sensor carries out signal acquisition; whether signal amplitude, phase and acceleration are within a normal range is judged through the envelope analysis module and the fault judgement module; and failures are detected corresponding to different situations. According to the invention, detection and failure diagnosis are integrated into a whole body, and diagnostic coverage and flexibility are high.

The invention provides a method and a system for diagnosing an open-circuit fault of a digital circuit. According to the method and the system, a digital signal output module is connected with a digital signal acquisition module, so as to selectively output a high level or a low level according to the actual state of the current circuit; the digital signal acquisition module is connected with a digital signal fault diagnosis module, so as to acquire a digital signal voltage value; when the digital circuit is short-circuited to a power supply, the acquired voltage value is equal to the voltage of the power supply; when the digital circuit is short-circuited to the ground, the acquired voltage value is equal to 0 V; when the digital circuit is in open circuit, the acquired voltage value is equal to one second of the voltage of the power supply; the digital signal fault diagnosis module performs comparative diagnosis on the output voltage value and standard voltage values under five conditions of high level, low level, short circuit to the power supply, short circuit to the ground and open circuit and judges whether the current digital input circuit has an open-circuit fault or not. After the digital circuit is diagnosed by utilizing the method and the system, various fault modes of the digital circuit can be recognized, the open-circuit fault of the digital circuit can be clearly and accurately reported, and the defect that open-circuit diagnosis cannot be performed on a traditional digital circuit is effectively overcome.

The invention provides a variable memory checking method which comprises the following steps: acquiring the starting address of a check unit in a memory region and corresponding data; performing CRC (cyclic redundancy check) on all units before the current check unit, and returning a first CRC value; performing CRC on all units after the current check unit, and returning a second CRC value; performing walking operation on the current data bit; performing CRC on all units before the current check unit, and returning a third CRC value; performing CRC on all units after the current check unit, and returning a fourth CRC value; comparing the second CRC value and the fourth CRC value when the first CRC value and the third CRC value are consistent, performing walking operation on next bit when the second CRC value and the fourth CRC value are consistent until all data bits are checked; and restoring data of the current check unit. Crosstalk among memory units can be detected, and high effective diagnostic coverage is realized.

The invention relates to a functional safe switching value outputting module with a high diagnostic coverage rate, wherein a switching value outputting unit is connected with a microprocessor, so as to convert a digital signal transmitted by the microprocessor into a switching value signal and output the switching value signal; one end of a diagnostic unit is connected with the switching value outputting unit, so as to acquire the switching value signal of the switching value outputting unit; the other end of the diagnostic unit is connected with the microprocessor, so as to feed back the acquired switching value signal to the microprocessor; the diagnostic unit receives a control signal and a configuration signal which are sent by the microprocessor; and the switching value outputting unit and the diagnostic unit jointly form a 1OO1D voting architecture, a switch of the diagnostic unit is mutually connected with a switch of the switching value outputting unit in series, and when a fault occurs, the microprocessor controls the switch of the diagnostic unit to be switched off, so that power supply input is cut off. The functional safe switching value outputting module provided by the invention adopts a DAC combined diagnostic unit having a rich self-diagnostic function as well as an output monitoring unit and a voltage monitoring unit and further improves the diagnostic coveragerate and the reliability and reduces cost and development difficulty.

The invention discloses a self-inspection device for a detection system for an absolute position of a lift car and a self-inspection method thereof. The self-inspection device comprises a grating ruler, a recognition assembly and a controller, wherein the grating ruler is vertically arranged in a liftway and is provided with at least two groups of marks which are arranged at intervals in the length direction of the grating ruler, each mark comprises a first identification unit and a second identification unit which are arranged at intervals in the length direction of the grating ruler, the recognition assembly is fixedly arranged on the lift car and comprises at least three sensors, the sensors are used for detecting the first identification units and the second identification units and are arranged at intervals in the vertical direction, the first identification units or the second identification units cannot be simultaneously detected at the same detection position, and the controller can receive feedback information sent by the sensors and judging whether a fault exists in the detection system or not according to the feedback information. The self-inspection device and the self-inspection method thereof have the advantages that the identification changes of the grating ruler can be comprehensively detected, and whether a fault exists in the detection system for the absoluteposition of the lift car or not can be automatically detected.

The invention relates to the technical field of server testing, and provides a server sound card audio function diagnosis method and system, and the method comprises the steps: driving to play a sample audio file, playing the sample audio file through an audio output interface, recording the played sample audio file through an audio receiving interface, and generating an audio receiving file; carrying out time domain analysis on the audio receiving file, obtaining an audio signal amplitude of the audio receiving file, checking and comparing the generated audio receiving file with a sample audio file, and judging whether the audio signal amplitude of the audio receiving file is normal or not; performing frequency domain analysis on the generated audio receiving file; the audio signal frequency of the audio receiving file is obtained, the generated audio receiving file is checked and compared with the sample audio file, and whether the audio signal frequency of the audio receiving file is normal or not is judged, so that the server sound card function is rapidly and effectively diagnosed, the product quality is ensured, and the diagnosis coverage rate and the diagnosis level are improved.

The invention provides a diagnostic device, system and method for a high-voltage relay and relates to the technical field of high-voltage relays. The device includes a controller, a first transistor,a second transistor, a first feedback circuit and a second feedback circuit, wherein the controller is connected to a gate of the first transistor, a drain electrode of the first transistor is connected to a battery, a source electrode of the first transistor is connected to a first coil end of the high-voltage relay, a source electrode of the first transistor is also connected to a controller through the first feedback circuit, the controller is connected to a gate of the second transistor, a source electrode of the second transistor is grounded, a source electrode of the second transistor isgrounded, a drain electrode of the second transistor is connected to a second coil end of the high-voltage relay, and a drain electrode of the second transistor is further connected to the controllervia the second feedback circuit. Compared with the prior art, the invention improves the diagnostic coverage for the high-voltage relay.

A battery system having a battery pack with a negative pole, a positive pole and a battery cell, a coupling network having a first negative terminal and a first positive terminal, a pack voltage divider, and a coupling voltage divider. The first positive terminal is connectable to the positive pole via a switch. Optionally, the first negative terminal is connectable to the negative pole via a switch. The pack voltage divider includes a two resistors connected between the positive pole and a first reference point. A negative pack measurement resistor and a negative sub-pack measurement resistor are dis-connectable from the negative pole or the first reference point via a switch. A positive coupling measurement resistor and a positive sub-coupling measurement resistor are connected between the first positive terminal and the first reference point. Two resistors are connected between the first negative terminal and the first reference point.

The invention discloses a controller circuit,a sampling method and a control method of an electric power steering system. The circuit comprises a three-phase motor, a microcontroller, a three-phase bridge module and a three-phase motor phase voltage state feedback circuit. The three-phase motor phase voltage state feedback circuit comprises three voltage division circuits and three pull-up circuits. The microcontroller is used for controlling the U-phase upper bridge field-effect tube, the U-phase lower bridge field-effect tube, the V-phase upper bridge field-effect tube, the V-phase lower bridge field-effect tube, the W-phase upper bridge field-effect tube and / or the W-phase lower bridge field-effect tube to be opened or closed, and carrying out power-on fault diagnosis on the U-phase upper bridge field-effect transistor, the U-phase lower bridge field-effect transistor, the V-phase upper bridge field-effect transistor, the V-phase lower bridge field-effect transistor, the W-phase upper bridge field-effect transistor and the W-phase lower bridge field-effect transistor based on the voltage acquired by the analog-to-digital conversion voltage acquisition end. According to the invention, accurate diagnosis of each field effect transistor in the three-phase bridge module is realized, and the diagnosis coverage rate of the field effect transistor is improved.

The invention provides a current acquisition and diagnosis circuit which comprises a current signal input end CH1, a sampling unit, a signal amplification unit and an analog signal-to-digital signal converter ADC. The current acquisition and diagnosis circuit is characterized in that the signal amplification unit comprises a plurality of signal conditioning operational amplifiers which are connected in parallel, the signal amplification unit is further connected with a current source in parallel, the current signal input end CH1 is connected with a detection unit, and the detection unit is connected to the analog-to-digital signal converter ADC. The invention further provides a failure diagnosis method of the circuit. The failure diagnosis method comprises the following steps: performing failure diagnosis on the switch SW1, the switch SW18 and the switch SW3; performing failure diagnosis on the analog signal-to-digital signal converter ADC, the signal conditioning operational amplifierOP1 and the signal conditioning operational amplifier OP2; carrying out failure diagnosis on the power supply I1 and the switch SW17; and performing failure diagnosis on the sampling resistor R1 andthe sampling resistor R9. The current acquisition and diagnosis circuit and the failure diagnosis method thereof have a relatively high self-diagnosis function and can detect failures of all devices in the current acquisition circuit and are high in diagnosis coverage rate.

A method monitors a sensor clock signal in a sensor unit, which is generated and output for a data transfer between the sensor unit and a control unit with a predefined period duration. A reference clock signal having a predefined reference period duration is received. The sensor clock signal is compared to the reference clock signal. Based on the comparison, a deviation of the current period duration of the sensor clock signal from a target period duration is detected. Based on the detected deviation, a counting pulse or a reset pulse is emitted.

The invention relates to a battery system (10) for an electric vehicle, comprising: a battery pack (5) having a positive electrode (22), a negative electrode (21), at least one battery cell (2) and a pack voltage divider (25); and at least one coupling network having a negative connection (11) and a positive connection (12), wherein the group voltage divider (25) comprises a positive group resistor (RP2) and a positive sub-group resistor (RSP2), which are connected in series with each other between the positive electrode (22) and a reference point (50), and a negative group resistor (RP1) and a negative sub-group resistor (RSP1), which are connected in series with each other between the negative electrode (21) and the reference point (50). The at least one coupling network has a coupling voltage divider (15), the coupling voltage divider comprises a positive coupling resistor (RK2) and a positive partial coupling resistor (RSK2), which are connected in series with each other between the positive connection (12) and the reference point (50), and a negative coupling resistor (RK1) and a negative partial coupling resistor (RSK1), which are connected in series with each other between the negative connection (11) and the reference point (50). The invention also relates to a method for diagnosing a battery system (10) according to the invention, wherein a positive group voltage (UP2) occurring at the positive component-group resistor (RSP2) is measured, a negative group voltage (UP1) occurring at the negative component-group resistor (RSP1) is measured, a positive coupling voltage (UK2) occurring at the positive component-coupling resistor (RSK2) is measured, a negative coupling voltage (UK1) occurring at the negative component-coupling resistor (RSK1) is measured, and the measured voltages (UP1, UP2, UK1, UP2, UK1, UP2, UK1, UK2, UK1, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1, UK2, UK1 The invention also relates to an electric vehicle comprising a battery system (10) according to the invention.

The invention relates to a functionally safe switching value output module with high diagnostic coverage, wherein the switching value output unit is connected to a microprocessor, and the digital signal transmitted from the microprocessor is converted into a switching value signal for output; one end of the diagnosis unit is connected to the switching value output unit , to collect the switching signal of the switching output unit; the other end is connected to the microprocessor, and the collected switching signal is fed back to the microprocessor; the diagnosis unit receives the control signal and configuration signal sent by the microprocessor; the switching output unit and The diagnostic units together form a 1001D voting structure. The switch of the diagnostic unit and the switch of the digital output unit are connected in series. When a fault occurs, the microprocessor controls the switch of the diagnostic unit to be disconnected, so that the power input is turned off. The invention adopts a DAC with rich self-diagnostic functions combined with a diagnostic unit, an output monitoring unit, and a voltage monitoring unit, which further improves the diagnostic coverage, improves reliability, reduces cost, and reduces development difficulty.

The invention provides a laser radar. The laser radar comprises a shell which is internally provided with an emitting cabin, a laser device assembly, aphotoelectric detector and adetection control unit, wherein the laser device assembly is arranged in the emitting bin, and the laser device assembly comprises a plurality of laser devices and is configured to be capable of emitting detection laser beams; the photoelectric detector is arranged in the emitting bin and is configured to receive stray light of the laser device and convert the stray light into an electric signal; and the detection control unit is coupled with the photoelectric detector and is configured to collect and analyze an electric signal of the photoelectric detector and judge whether the laser device assembly works normally or not according to an analysis result.

The invention discloses a control system and method for a safety band-type brake of a frequency converter. The control system comprises two or more processors, a control signal output channel, an output state feedback channel and a switch. The processors are in one-to-one correspondence with the control signal output channels, the output state feedback channels and the switches. Each processor isused for respectively outputting a control instruction to the corresponding control signal output channel when safety band-type brake control is carried out, and outputting a corresponding control signal through the control signal output channel so as to disconnect a switch connected with the control signal output channel and enable a brake band-type brake device connected with the switch to carryout power-down band-type brake; and receiving state feedback signals fed back by the corresponding output state feedback channels, and diagnosing whether software exception and / or hardware exceptionexists or not by judging whether the state feedback signals are consistent with the control instruction or not. The control system and the control method are easy to implement, high in adaptability, high in reliability and low in cost.

The invention provides a signal detection circuit, a DC / DC converter, a detection method and a storage medium. The signal detection circuit comprises a current detection resistor, a first signal acquisition processing sub-circuit, a second signal acquisition processing sub-circuit and a diagnosis verification unit. The first signal acquisition processing sub-circuit is used for acquiring a first current signal of the current detection resistor; the second signal acquisition processing sub-circuit is used for acquiring a second current signal of the current detection resistor; the diagnosis and verification unit is used for diagnosing failure modes of the current detection resistor, the first signal acquisition and processing sub-circuit and the second signal acquisition and processing sub-circuit according to the first current signal and the second current signal; and the failure mode comprises a signal fault type which needs to be covered by the ASIL D. The signal detection circuit provided by the invention is simple in structure and easy to implement; and according to the signal detection circuit, the DC / DC converter, the detection method and the storage medium provided by the invention, the diagnosis coverage rate of a safety mechanism can be improved at relatively low cost.