Abstract:
The invention relates to a method and an arrangement for evaluating combustion processes in an internal combustion engine, using a model which takes the time-variant transmission between pressure and structure-borne noise as a basis for relevant low-frequency vibrations and which only uses individual components of the reconstructible pressure signal to establish parameters and states relevant to combustion. Speed independence is achieved by creating time dependency using an angle-dependent transmission function.
Abstract:
A vehicle diagnostics interface apparatus (1), for interfacing with a vehicle diagnostics unit having one or more vehicle fault indicator lights (2), comprises: a sensing device (3) for receiving light from the fault indicator light (2) and producing electrical signals, a signal processing section (4) (shown in the dotted box) for converting the electrical signals into an output voltage (6) (output electrical signals) suitable for processing by a decoding device, and a connection device (8), for connection to a decoding device (9) connected to an output device such as a display screen (10) or a printer for outputting the vehicle diagnostic information.
Abstract:
A system and method for obtaining engine diagnostic and prognostic information utilizing current, time and crank position data obtained from the starter motor during the starting of an engine and represented as a starter motor (150) current waveform. The time domain waveform is transformed to the spatial domain. Thereafter, the spatial waveform is deconvolved into its constituent components using known digital signal processing, such as Fourier Transformations, and along with derived engine parameters provide engine status and diagnostic information. Weibull techniques may be used to further process the engine status and diagnostic information to improve accuracy.
Abstract:
The invention relates to a method and a system for diagnosis of faults in distributed systems, preferably but not exclusively for distributed electrical systems in vehicles. The distributed system is systematically documented in its entirety in a database (61) as a number of mutually autonomous user functions (70a-70d), each of which entails a functionality of value perceivable by the user. These user functions are documented in a chain of subfunctions, whereby several subfunctions can occur is several user functions, which user functions are then termed overlapping function domains. In accordance with the invention this documentation is used for troubleshooting to exclude non-defective subfunctions from further troubleshooting in defective user functions. By comparing defective user functions with non-defective user functions, systematic and preferably computer-aided troubleshooting can rapidly be implemented.
Abstract:
Dynamometric friction brake to be used with benches intended to measure the power of engines, characterized in that a computer controls the actuating elements and the measuring elements during tests of limited duration. The brake is comprised of a mobile disk joined to the motor shaft and preferably perforated for refrigeration purposes; two fixed and rigid elements slide on said disk thereby creating by friction a resistant torque which can be measured by means of a load cell. Said rigid elements are actuated against the mobile disk by means of bellows receiving pressure air through a computer-controlled valve.
Abstract:
The invention relates to a device for analysing the most important environmentally relevant substances such as CO,HC and NO in exhaust fumes from motor vehicles, based the principle of IR gas absorption. Measuring signals and a reference signal are picked up along an optical measuring distance (special steel tube) using an infrared source and a detector and a measuring value is determined by forming quotients. The OBM system consists of modular components such as a removal device, an exhaust gas processor, an analysis device and an evaluation unit which are integrated into the construction of the motor vehicle. Vibratory conditions in the motor vehicle are compensated by a robust design structure and correction of temperature drift by forming a first derivation and adjustment of the signal height by electronically adjustable amplification regulation. Other correction options are calibration of the zero line with ambient air during switching operations in addition to the creation of a range of tolerance around the noise signals in the detector. The measuring system is to be fitted in the future in all motor vehicles as an addition to the existing OBD (On board Diagnosis) system. Retrofitting devices can be used for older vehicles.
Abstract:
A dynamometer (10) includes a pair of vehicle wheel-engaging rolls (21 and 25) coupled through a clutch (55) to a passive power absorption unit (40) which includes a flywheel (41) and an eddy current brake (45). A lift (30) between the rolls can raise the vehicle wheels (15) out of engagement with the rolls without braking the rolls. The lift cooperates with a frame (11) for partially covering and protecting the access of one of the vehicle rolls so that, when the lift is raised, the vehicle can be driven off the dynamometer substantially without contact of the vehicle wheels with the access roll (21).
Abstract:
The invention concerns a sensor comprising a) a cylindrical base (1) formed by an axial shaft (2) projecting from a ring-shaped collar (3), both traversed by an axial bore (4); b) a washer (6) made of piezoelectric material passing on the shaft; c) means for sampling (71, 72) the voltage prevailing between two radial faces of the washer; d) a ring-shaped mass (9) also passing on the shaft (2); and e) stop means co-operating with the ring-shaped collar (3) for mutually squeezing the washer (6) and said mass (9). The stop means consist of a flange (17) projecting from said shaft (2) and formed of the material of a predetermined section thereof, deformed by the crushing stress of said base (1).
Abstract:
The present invention relates to a quality control system for testing devices, such as mechanical devices with moving parts, such as electro motors, comprising a fixture adapted to hold and operationally engage with the device, at least one energy flow transducer being positioned at the fixture so as to be operational communication with the device when the device is operationally engaged with the fixture, the transducer sensing acceleration of and force exerted by the device, and providing electrical output signals in response to and as a function of sensed acceleration and forces, respectively, and a measuring apparatus for receiving the output signals from the at least one energy flow transducer, and for determining parameters derived from sensed forces and accelerations.
Abstract:
A method of testing the assembled state of an internal combustion engine and quickly and accurately judging whether there is at least one fault with the assembling of the engine. While an exhaust-valve side space (100) is closed and a crank shaft (18) is rotated at a constant speed, the pressure in the exhaust-valve side space and the pressure in a surge tank (96) are detected by pressure sensors (106, 98), respectively. The assembled state of an engine (90) is tested based on the predetermined conditions of the detected two pressures. Those predetermined conditions may be the crank-shaft angles when the two pressures take respective maximal values, the crank-shaft angles when the two pressures change from their constant states to their increasing or decreasing states, etc. Based on those values, incorrect phases of crank and cam pulleys, incorrect clearances of intake and exhaust valves, missing of a compression ring, etc., can be identified.