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National Instruments NI 9751 Скачать руководство пользователя страница 23

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NI 9751 User Manual

Figure 24.

Piezo IPhaseArray Configuration Example 4

Figure 25.

Current and Voltage Traces from Piezo IPhaseArray Configuration Example 4

HVTarget = 150 V. Charge voltage = 100 V.

Figure 26.

Piezo IPhaseArray Configuration Example 5

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Содержание NI 9751

Страница 1: ...SHC68 68 RDIO...

Страница 2: ...ver Module Contents Safety Guidelines 2 Introduction 2 Pinout 3 Hardware 4 Powering the Module 4 Platform Compatibility 6 Internal Boost Power Supply 7 Direct Injector Drivers 10 Connecting Injectors...

Страница 3: ...stances Introduction The NI 9751 Direct Injector DI Driver Module includes the following components CompactRIO cRIO module with the following components for driving a variety of diesel and gasoline DI...

Страница 4: ...specified for each phase First phase can be configured to end after first peak DI Calibrator application which assists with firing injectors on a test bench for configuring the injector current voltag...

Страница 5: ...e external screw terminal connector block the terminals of which are labeled BATT 0 and GND 9 A typical power source is an automotive 12 VDC or 24 VDC battery system but the NI 9751 can accept power f...

Страница 6: ...ange from 24 V to 190 V and is optionally used to provide the boost voltage in place of the internal boost supply Because the internal boost power supply is a significant contributor to the internal m...

Страница 7: ...ontrol modules are not compatible with the National Instruments CompactDAQ chassis You can use NI Powertrain Control modules with NI cRIO 911x NI cRIO 907x and NI R Series Expansion systems under the...

Страница 8: ...valve Working voltage requirement HVTarget Frequency of injection events Injector solenoid back boost time BackBoostTime Injector Solenoid Resistance Typical common rail diesel injector solenoids wil...

Страница 9: ...nt level This configuration can lead to back boosting the power supply over the required working voltage Use the internal high voltage supply to prevent this from happening If the working voltage exce...

Страница 10: ...nductance while not using the boost supply Internal Boost Power Supply Benchmarks Table 2 describes bench test results that demonstrate power supply capability With air flow over the NI 9751 you can e...

Страница 11: ...high voltage supply connects to the same internal capacitance as the internal boost supply Ensure that you make a permanent connection before you power the external power supply When an external high...

Страница 12: ...per and lower current dithering setpoints phase duration and high voltage or battery voltage drive circuit Use the high voltage drive circuit only when necessary to conserve internal boost power suppl...

Страница 13: ...of the injection command is not determined by the total durations of the IPhaseArray elements but by the Boolean command delivered to the DI Driver FPGA Express VI If the Duration parameter of an IPh...

Страница 14: ...ments 13 Figure 5 Current and Voltage Traces from Solenoid IPhaseArray Configuration Example 2 Figure 6 Solenoid IPhaseArray Configuration Example 3 Figure 7 Current and Voltage Traces from Solenoid I...

Страница 15: ...iguration Example 4 Phase1FirstPeakEnable The Phase1FirstPeakEnable is a Boolean control that transfers operation from the first phase to the second phase upon reaching the first current peak that cor...

Страница 16: ...ght cause unpredictable injector valve closing Calibrate the BackBoostTime long enough for the energy within the injector solenoid to fully discharge to the internal boost power supply If BackBoostTim...

Страница 17: ...16 ni com NI 9751 User Manual Figure 13 BackBoostTime 0 050 ms Figure 14 BackBoostTime 0 100 ms Figure 15 BackBoostTime 0 150 ms...

Страница 18: ...y Electrically a piezo stack is like a capacitor because it requires current in one direction to charge up to a specified voltage and current in the opposite direction to discharge The typical charge...

Страница 19: ...ed Schematic for Two Piezo Injectors Internal Boost Power Supply Current Sense Comparator Circuitry High Side High Voltage Switch 47 H Inductor 47 H Inductor Short Piezo Injector 1 CH1 Low Side Switch...

Страница 20: ...connect Channel 3 with a shorting jumper between the Inj and Inj terminals When you enable PiezoInvert mode the first four IPhaseArray elements are used for discharge and the last four elements are u...

Страница 21: ...voltage waveforms for seven different IPhaseArray configurations for piezo injectors Figure 18 Piezo IPhaseArray Configuration Example 1 Figure 19 Current and Voltage Traces From Piezo IPhaseArray Con...

Страница 22: ...Voltage Traces from Piezo IPhaseArray Configuration Example 2 HVTarget 150 V Charge time 124 s Figure 22 Piezo IPhaseArray Configuration Example 3 Figure 23 Current and Voltage Traces from Piezo IPha...

Страница 23: ...al Figure 24 Piezo IPhaseArray Configuration Example 4 Figure 25 Current and Voltage Traces from Piezo IPhaseArray Configuration Example 4 HVTarget 150 V Charge voltage 100 V Figure 26 Piezo IPhaseArr...

Страница 24: ...es from Piezo IPhaseArray Configuration Example 5 HVTarget 150 V Charge voltage 100 V step then 150 V Figure 28 Piezo IPhaseArray Configuration Example 6 Figure 29 Current and Voltage Traces from Piez...

Страница 25: ...tware settings to achieve a specified current voltage profile Injector Driver Circuit Faults and Protections A short circuit in the NI 9751 might result in some scenarios The NI 9751 detects each poss...

Страница 26: ...ring the high voltage or low voltage portion of the current profile INJ shorted to INJ This condition causes a HighVoltageDriver critical fault or LowVoltageDriver critical fault during an injection e...

Страница 27: ...T input range 7 VDC to 32 VDC Recommended main battery input power capacity 100 W External Power EXT PWR for boost power supply replacement 24 VDC to 190 VDC Note When using an external high voltage p...

Страница 28: ...0 oz 1 The recommended maximum time at 40 A is 100 s 2 Longer injection durations are possible but you must consider the duty cycle of the driver For example a single one shot pulse on an injector tes...

Страница 29: ...26 1 Class A emissions Industrial immunity EN 55011 CISPR 11 Group 1 Class A emissions AS NZS CISPR 11 Group 1 Class A emissions FCC 47 CFR Part 15B Class A emissions ICES 001 Class A emissions Cautio...

Страница 30: ...nment weee Battery Replacement and Disposal Battery Directive This device contains a long life coin cell battery If you need to replace it use the Return Material Authorization RMA process or contact...

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