1675results about "Rapid change measurement" patented technology

A multi-mode internal combustion engine and method of operating the engine is provided which is capable of operating in a variety of modes based on engine operating conditions to enhance fuel efficiency and reduce emissions. The multi-mode engine include a fuel delivery system and control system for permitting the engine to operate in a diesel mode, a homogeneous charge dual fuel transition mode, a spark ignition or liquid spark ignition mode and/or a premixed charge compression ignition mode. The control system and method permits the engine operation to transfer between the various modes in an effective and efficient manner by controlling one or more fuel delivery devices or other engine components so as to move along a continuous transfer path while maintaining engine torque at a substantially constant level.

A sensor head characterizes unsteady pressures in a fluid flowing within a pipe, as may be caused by one or both of acoustic waves propagating through the fluid within the pipe and/or pressure disturbances that convect with the fluid flowing in the pipe. The sensor head comprises a rigid support structure and at least one transducer attached to the rigid support structure. The rigid support structure holds the transducer in contact with an outer surface of the pipe. The at least one transducer senses relative movement between the outer surface of the pipe and the support structure and provides a signal indicative of unsteady pressures within the fluid at a corresponding axial position of the pipe in response to the relative movement. The support structure may be attached to each transducer in an array of transducers, and may include a handle secured thereto for manipulating the sensor head into contact with the pipe. Output signals from the transducers are provided to a processing unit, which processes the output signals to provide a signal indicative of at least one parameter of the flow process.

The automated fault diagnostic system operates on engine-compressor sets with one vibration sensor per sub-group of engine cylinders and one sensor per compressor cylinder. Vibration signals linked to crankshaft phase angle windows (“VT”) mark various engine events and compressor events. In data-acquisition-learning mode, VT is stored for each engine and compressor event per operating load condition, statistical process control (SPC) theory identifies alarm threshold bands. Operator input-overrides are permitted. If no baseline data is stored, the system automatically enters the learn mode. To monitor, current VT are obtained and current load condition is matched to the earlier load set and alarms issue linking predetermined engine or compressor event to the over-under VT. Baseline data, SPC analysis, alarms and monitoring are set for crankcase flow, engine cylinder exhaust temperatures, ignition system diagnostic messages. Compressor performance alarms use suction and discharge temperatures and pressures.

A system comprising a measurement device and a handheld device is disclosed, the system adapted to withstand, detect, record, and display heat cycle event counts. The measurement device comprises a sensor for measuring and a heat cycle detection unit. The heat cycle detection unit comprises a temperature or pressure responsive element, a detection module, data interface, and data memory. The handheld device comprises a screen, a button, a communication circuit, and a processing system. The communication circuit is configured to communicate with the measurement device and a computing device and the processing system is configured to receive non-measurement information from the measurement device, display the received information on the screen, and cycle the received information displayed on the screen based on an actuation of the button, wherein the handheld device is used to display a heat sterilization cycle count of the measurement device.

A pressure glow plug for a diesel engine has a glow plug body 2 for being inserted into a cylinder of the diesel engine, a heating rod 1 that is arranged in the glow plug body 2 and a pressure sensor 9 that is arranged between the heating rod 1 and the glow plug body 2 in such a way that the pressure in the combustion chamber of the cylinder that is transmitted by the heating rod 1 influences the pressure sensor 9. The heating rod 1 is arranged in the glow plug body 2 such that it can be displaced in an axially sliding fashion, namely by a corresponding sliding element, for example, a membrane 7 or seals 3.

An apparatus for detecting the pressure and temperature in the intake tube of an internal combustion engine. A temperature sensor and a pressure sensor are secured to a carrier together with an evaluation circuit in a common housing with as little strain as possible. The housing includes at least two chambers separate from one another, one of which forms a pressure chamber that communicates with the intake tube via a stub and is sealed off from the environment in which the pressure sensor is secured. The other chamber serves to secure the temperature sensor therein by use of connection elements, and sealing adhesive connections that decouple mechanical strains for securing the carrier and sealing off the pressure sensor.

When a maximum value of vibration intensity (maximum vibration intensity) (Vmax) acquired from a vibration sensor (33) in a low engine speed/high engine load (operating region (R)) is equal to or greater than a given threshold value (X), a spark timing of a spark plug (16) is shifted from a point set in a normal state on a retard side with respect to a compression top dead center, farther toward the retard side. Then, when a maximum vibration intensity (Vmax2) acquired after the spark timing retard is greater than a maximum vibration intensity (Vmax1) acquired before the spark timing retard, it is determined that preignition occurs. This technique makes it possible to reliably detect preignition using the vibration sensor, while distinguishing the preignition from knocking. An in-cylinder pressure sensor for detecting an in-cylinder pressure of an engine may be used to determine the presence or absence of the preignition, in the same manner.

An electronic control for determining knocking in an internal combustion engine having an intake injector for injecting fuel into an air intake port and an in-cylinder injector for directly injecting fuel into a combustion chamber. Knocking is determined based on an output signal from a knock sensor during a knock determination period. The electronic control unit alters the knock determination period in accordance with the ratio of the amount of fuel injected by the two injectors.

A method of mounting an accelerometer to an internal combustion engine comprises securing the accelerometer to a mating surface on an engine component external to a combustion chamber where the accelerometer can generate a signal output that is characteristic of engine knock, when it occurs, and at least one other combustion behavior inside the combustion chamber during a combustion event. The method further comprises connecting a signal wire at one end to the accelerometer and at an opposite end to a signal processor, and increasing the signal output's signal-to-noise ratio.

A pressure detection device includes a sensing part that outputs an electrical signal responsive to an applied pressure, a pressure receiving diaphragm that receives a pressure from a subject device, a cylindrical stem having a first end connected to the sensing part and a second end connected to the pressure receiving diaphragm, and a pressure transmission member located within the cylindrical member to transmit the pressure received by the pressure receiving diaphragm to the sensing part. In the pressure detection device, a side wall portion of the cylindrical stem has a spring portion which is provided to generate an elastic force in an axial direction of the cylindrical member. Accordingly, fluctuations in a spring characteristic acting on a pressure transmission mechanism of the pressure detection device can be effectively restricted by the spring portion.

A device for detecting the pressure and the temperature in the intake tube of an internal combustion engine, including a temperature sensor, a pressure sensor and a substrate each of which are secured in a housing with as little stress as possible with the pressure sensor secured on a substrate together with an evaluation circuit. The temperature sensor measures precise temperature measurement. In order to introduce a fluid medium that is under pressure, a neck part is secured to the housing and an adapter is joined both to the substrate and to the neck part via adhesive seals that decouple mechanical stress from the pressure and temperature detectors.

An ion current detection device of an internal combustion engine includes a detection voltage generation device which applies a voltage to an ignition plug to generate an ion current in a cylinder of the engine. A current to voltage conversion circuit detects and converts the generated ion current to a voltage signal. A bandpass filter extracts an ac component within a specified frequency range from the voltage signal produced by the current to voltage conversion circuit. An ion current threshold detection portion produces an ion current detection signal when the detected ion current exceeds a predetermined threshold current. A filter characteristic control circuit controls the characteristic of the bandpass filter to suppress the sensitivity of the filter for a predetermined period of time right after the ion current detection signal is detected and, after the predetermined period of time, increase the sensitivity of the filter for detection of the ac signal with the specific frequency.

A method for determining whether a variable valve actuation (VVA) device or subsystem is operating in an improper mode of operation is performed in real-time by an embedded engine or powertrain controller configured to monitor and evaluate an already-available knock sensor output signal. The knock sensor output is captured during a predefined sampling window, defined to include a valve closing event when the VVA device is operating in a proper mode. The captured knock sensor output signal is processed to detect the presence (or absence) of a valve closing event. The absence of a valve closing event when one is expected is indicative of a malfunctioning VVA device.

The invention relates to an apparatus for measuring the cylinder internal pressure of internal combustion engines and, in particular, of gas engines, said apparatus having a first valve (5) which opens into the cylinder interior space, a measurement chamber (6) which can be connected to the cylinder interior space (1a) and can be disconnected from the latter by means of the first valve (5), and a pressure sensor (8) which is arranged in the region of the measurement chamber (6) in order to measure the pressure in the cylinder interior space when the first valve (5) is open. Permanent operation without thermal overload is enabled in such a way that at least one second valve (13) is provided in the region of the measurement chamber (6), said second valve being able to be changed to a closed position at least when the first valve (5) is open in order to seal off the measurement chamber (6) towards the outside.

An engine intake valve has a threaded blind bore opening from its top surface facing the engine cylinder. A pressure sensor has a body portion whose exterior is threaded and is configured in size and shape to be completely received within and retained in the blind bore. The pressure sensor is configured to generate a pressure signal indicative of the cylinder pressure.