Tech a says that ehis are ecm controlled but not limited by hard value nops. Pdf power drive circuits for piezoelectric actuators in. It accommodates up to three solenoid direct injectors or two piezo injectors, but you must use the same injector type per module. Illustration 1 shows the stack with no supply voltage and illustration 2 shows the increase in height of the stack when the supply voltage is switched on. On siemens piezo injectors the actuator is formed by 80. One thing to remember about piezo injectors is that the voltage levels are much higher than on solenoid types, and they can reach 250 v on some systems. The injector driver controls three transistors switches that apply the boost voltage to open the injector and then modulates the current to hold the injector open. When the ecu driver circuit turns off, the spring closes the injector valve. On the verge of liquidation, delphi intros new direct piezo diesel injector.
The bosch piezoelectric crystal injector operates using a crystal stack, usually quartz, that changes size when. Piezo actuated diesel fuel injector is gradually replacing the conventional solenoid injector since it can provide a more flexible control ability of the fuel injection. The kit includes labview fpga and rt vis for controlling the driver channels. Piezo actuated diesel fuel injector is gradually replacing the conventional. There are two common types of driver circuits currently in use on toyota efi engines. Nissan, along with many other manufacturers, uses piezo injectors in its diesel engines. However for a piezo injector the injection cycle takes the form of two miniscule injections which are about 200 us long. Power drive circuits for piezoelectric actuators in. The magnetic field created causes the injector to open against spring tension. Cit800 diesel common rail injector tester for bosch denso. A boosted voltage supply up to 65 volts is generated in the pcm and used to initially open the injector. For fully utilizing the advantages of the piezo actuated injector, precision control of the piezo actuator is therefore needed.
Most electronic fuel injection efi systems use an ecu with 12 volt saturated circuit drivers. Maximum pressure increased from 180 mpa to 200 mpa. In this research, we analyzed the electrical and mechanical characteristics of the. These injectors work by passing electrical current through a stack of piezo crystals, causing them to expand. High voltage 80v for a fast injector response time. Fuel injection with a common rail injector is possible when controlling the magnitude of t he. A one shot timer circuit sends a predetermined timing signal to a first controller circuit interconnecting the one shot timer circuit and the solenoid coil wherein the. Diesel piezoelectric injector driver circuit youtube. Electrical characteristics of the piezo injector were analyzed. Each injector is controlled by two circuits from the pcm. Design and development of a directacting piezoelectric. The rapidly switched cri3 piezo injector injects into the cylinder the amount of fuel required for economical combustion, independent of the driving situation. Development of an adaptive driving module for piezo. Cit800 diesel common rail piezo and electromagnetic injector driver.
A study on the piezo injector control algorithm for crdi. The drive circuit includes a voltage input for receiving a voltage signal, an energy storage device coupled to the voltage input for storing an electrical charge, a bidirectional current path coupled to one or more piezoelectric injectors, an inductor coupled. Piezo electricity results from squeezing or applying pressure from. The lml piezo injectors require 150psi of fuel pressure on the return side in order to fire correctly. When considering standard ehi operation in a typical cr diesel fuel system. I need to come up with a circuit that will output up to 100v preferably using. When you turn off the injector the piezo stack contracts and generates voltage. First, i wanted to make sure that the injectors were getting the correct signals from the ecu.
Commercial piezoelectric fuel injectors, in general, do not use the full potential offered by piezoelectric actuators and often impede. Newly designed g3pi piezo injectors with builtin iart pressure sensor and fuel temperature measurement function system pressure. The voltage used on the diesel injectors is much higher though. Electric circuit for piezo injector driver development of an adaptive driving module for piezo actuated diesel fuel injector fig. Unlike a typical solenoiddriven or heuistyle injector, a piezo stack injector can operate at very high speeds 0400 micro seconds, allowing multiple injection events per engine cycle. Explains in detail how the piezo injector is triggered from within the e cm. P0627 fuel pump circuit malfunction open circuit p062d fuel injector driver circuit performance bank 1 p064c glow plug control module p066b cylinder. Modern directinjection diesel engines produce low amounts of carbon dioxide, carbon monoxide, unburned hydrocarbons, reactive nitrogen compounds nox, and particulate matter pm. Shows how actual transistor drivers react electrically pushpull transistor arrangement to trigger the piezo device. The injected fuel quantity is proportional to the injector duration opening time, fuel rail pressure, fuel temperature and fluid viscosity.
Pdf this article presents two designs of power amplifiers to be used with piezo electric actuators in diesel injectors. Piezo actuators convert electrical power into mechanical power motors or, alternatively, mechanical power into electrical power generators. The injector driver controls three transistors switches that apply the boost voltage to open the injector and then modulates the current to hold. Ni 9751 direct injector driver module user manual national. Directinjection diesel engines, which use an electronically controlled common rail. The engine will cut out if the control module detects any faults with. The continental injector has hundreds of little piezo slices stacked on top of each other so that the combined expansion increases the total motion. The experiments for the gdi injection quantities are conducted under 60100 bar fuel pressures, 12002000. Piezo injector drivers overview all system components. Current vs voltage piezzo diesel injector automotive. Dieselpiezoelectricinjectordrivercircuit video dailymotion. The piezoelectric fuel injector for diesel systems is a a highly accurate injection solenoid that works based on the piezzo effect.
The piezo actuator allows extremely short switching times for precise control and stability of smallest injection quantities possible. The noid light is designed for a circuit with a high resistance injector generally 12 ohms or above. Piezo injection and high side fet drivers electronics forums. The purpose of this study is to develop a piezo injector driver for commonrail direct injection diesel engines. Study on effects of common rail injector drive circuitry with. Amcr2000 crdi common rail diesel fuel piezo injector tester for boscch densso delphi simmens, common rail injector repair tools amcr2000 highpressure common rail injector controller is to imitate the engine ecu engine control unit, while providing bossch, deenso, delphhhi and other common rail system control signals, driven high pressure common rail pump and high. The topologies as well as the controller approach and implementation are discussed. Product brief cit800multifunction of common rail injector tester can accurately and effectively, to imitate ecu drive signal for each work condition of injector. Electric circuit for piezo injector driver development of an adaptive driving module for piezo actuated diesel fuel injector. These injectors are used in both petrol and diesel engines to improve their persformance and efficiency. But because this motion is in the wrong directiondown. When the regulator wears out the truck can be difficult to start or wont start at all. Thirdgeneration common rail diesels now feature piezoelectric injectors for increased precision, with fuel pressures up. Development of an adaptive driving module for piezo actuated.
Obd ii fault code p062d is a generic code that is defined as fuel injector driver circuit performance bank 1, and is set when the pcm powertrain control module detects an inconsistency between the number injection command, and injection confirmation signals for one or more fuel injectors. The pcm directly supplies the fuel injectors with the 80 volts required to operate, so theres no external injector driver module of any kind similar to the 6. The developed injector driver is verified by experiments under various fuel pressures, injection durations and driving circuit voltages. To prevent extremly high voltages and to control the turn off time, the injectors are discharged into a controlled impedance which develops the reverse current. On the verge of liquidation, delphi intros new direct. Tech b says that ehis are used with common rail fuel injection systems. A drive circuit is provided in a full hbridge and half hbridge configuration for controlling one or more piezoelectric fuel injectors. That would manifest itself as a non working driver though i am specifically seeing failed devices, not ones that are simply not operating properly. Recent listings manufacturer directory get instant insight into any electronic component. In the diesel i will need to switch the positive with a constant grounding source. A control strategy for charging and discharging the actuator are proposed. A piezoelectric diesel injector delivers atomized fuel directly to the engine combustion chamber when signaled to do so by the engine control module ecm. These systems are very inexpensive, simple, and reliable. Piezo injectors signature test technical focus snapon.
Direct acting piezo injectors a new generation of diesel injector technology will help vehicle manufacturers meet. Development of an injector driver for piezo actuated. The engine unit controls the piezo injectors to ensure that the right amount of diesel fuel is injected into the cylinders at the right point in time. Product name status description features package qlevel si9241aey singleended bus transceiver 200kb typical, reverse bat protection smd so8 si9243aey single ended bus transceiver 200kb typical, reverse bat protection smd so8. Engine performance can be benefitted from such flexible injection. What it doe not explain fully is that the piezo stack expands when you apply the voltage to turn on the injector. Some advanced common rail fuel systems perform as many as five injections per stroke.
The drive circuit includes a solenoid coil for each electromagnetic fuel injector. The detailed specifications of the test engine are shown in table 2. A piezoelectric actuator provides high force generation and fast response time. On piezo injectors the actuators are used as motors and modify their shape under the action of an electrical fields. This article presents two designs of power amplifiers to be used with piezo electric actuators in diesel injectors. Fuel injection with a common rail injector is possible when controlling the magnitude of t he hydraulic pressure acting on the nozzle needle. The return line circuit has a pressure regulator to maintain this desired pressure.
A diesel piezo injector driver was developed using microcontrollers and mosf ets. An experimental study of the driving of a solenoid type diesel. Which of the following explains why piezo actuators respond faster to injector driver signals than equivalent solenoid actuators. This type of driver works by supplying 12 volts to the injectors and the ecu turns it on and off to establish a fuel injector pulse. Di driver simplified schematic for a single inverted piezo injector. This user manual contains information for the ni 9751 direct injector driver module. Common rail direct fuel injection is a direct fuel injection system for diesel engines it features a highpressure over 2,000 bar or 200 mpa or 29,000 psi fuel rail feeding solenoid valves, as opposed to a lowpressure fuel pump feeding unit injectors or pump nozzles. Injector driver circuits toyota engine control systems. The highest pressure that a diesel injection circuit is subject to is known as. An electronic fuel injector driver circuit is a high speed operator of electromagnetic fuel injector valves for internal combustion engine. Tech a says that high pressure fuel can exit an injector at the speed of sound.
Further different approaches to fulfill the direct injection requirements will be discussed. The rapidly switching cri3 piezo injector allows short injection intervals which inject into the cylinder the amount of fuel required for economical combustion, independent of the driving situation. Common rail diesel fuel injection is now the state of the art in engine injection. Crd bosch piezo injector circuit current pico auto. Power drive circuits for piezo electric actuators in automotive applications abstract. Principle of operation of the common rail piezo injector. Am cr2000 touch screen type crdi common rail diesel fuel. The designed injector driving circuits are tested to verify its feasibility. Up to ten individual injections are possible per injection cycle. Piezo injectors use piezoelectric technology to open and close fuel injectors at extremely high speeds and precision to inject fuel into an internal combustion engine.
Us5430601a electronic fuel injector driver circuit. For this purpose, a pairswitch circuit capable of charging and discharging the current supplied to the injector has been developed. Driving circuits for a highpressure fuel injector and control of fuel injection. Piezo fuel injectors cri4, which use piezo crystals as part of a rapid actuator, are helping manufacturers to meet their euro 6 target. Diesel piezoelectric injector driver circuit amazon printed books 3786463 amazon kindle edition. Compactrio crio module with the following components for driving a variety of diesel.
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