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| Number | Title | Issue Date |
| 5003479 | Diagnosis system for a motor vehicle A system for diagnosing a motor vehicle has a diagnosis device including a computer having a central processing unit and a RAM and ROM. The ROM stores a plurality of programs for diagnosing an electronic control system for controlling an engine. The ROM s... | 03/26/1991 |
| 5003478 | Diagnosis system for a motor vehicle A system for diagnosing a motor vehicle has a diagnosis device including a computer having a central processing unit and a memory, the memory having a plurality of programs for diagnosing an electronic control system for controlling an engine. An indicato... | 03/26/1991 |
| 4996643 | Diagnosis system for a motor vehicle An electronic control system mounted on a motor vehicle has an identification code representing the type of the vehicle. A control unit provided in a diagnosis device selects a diagnosis program for diagnosing the control system from a plurality of diagno... | 02/26/1991 |
| 4964049 | Diagnosis system for a motor vehicle An electronic control system for controlling an automotive engine is mounted on a motor vehicle. A memory in a computer stores a plurality of data formats. One of the data formats is selected, and a data demand signal dependent on a selected data format i... | 10/16/1990 |
| 4962456 | Diagnosis system for a motor vehicle An electronic control system for controlling an automotive engine is mounted on a motor vehicle. A memory in a computer stores a plurality of data formats and signaling speeds. One of the data formats and signaling speeds is selected, and an answer demand... | 10/09/1990 |
| 4926330 | Diagnosis system for a motor vehicle A system for diagnosing a motor vehicle has a diagnosis device including a computer having a central processing unit and a memory, the memory having a plurality of programs for diagnosing an electronic control system for controlling an engine. Terminals a... | 05/15/1990 |
| 4924398 | Fault diagnosis system for automotive electronic devices A fault diagnosis system for automotive electronic devices, suitable for use in an automobile having at least one electronic device which is provided with a sensor for sensing the state of operation of at least one automotive part and an actuator for cont... | 05/08/1990 |
| 4922443 | Data acquisition and processing equipment for testing automotive vehicles Data acquisition and processing equipment permits simultaneous testing of a plurality of automotive vehicles located at different test stations of a technical test center. The equipment comprises remote control boxes each having an electronic identity, a ... | 05/01/1990 |
| 4903220 | Dual ported speed up memory in ROM location for engine analyzer An IBM-compatible computer based engine analyzer includes a RAM memory in a ROM cartridge location. A data acquisition system operates substantially independently of the system microprocessor to acquire engine test signals, convert them to digital form an... | 02/20/1990 |
| 4885935 | Engine testing system An engine testing system tests an engine at the end of a production line by controlling the fuel charge and ignition spark timing of an operating engine as a function of engine speed and air charge. The test is accomplished without the need for mass air f... | 12/12/1989 |
| 4862371 | Fault diagnosis system for electronic devices on automobiles A fault diagnosis system for automotive electronic devices which are adapted to transmit their diagnosis data at different data transmission speeds peculiar thereto. The system has a memory device for storing transmission data concerning speeds of data tr... | 08/29/1989 |
| 4836015 | Method and apparatus for determining the compression ratio of an engine cylinder A method of determining the compression ratio of a cylinder of an internal combustion engine. While the engine is being driven by a prime mover a PV curve is developed which is stored in the memory of a microprocessor. The unswept volume of the cylinder i... | 06/06/1989 |
| 4821217 | Programmable jet engine test station A programmable test station automatically performs static tests of electrical and pneumatic systems of jet aircraft engines. The test station automatically stimulates the systems to be tested on each engine and measures their response. A programmable data... | 04/11/1989 |
| 4809540 | Method and apparatus for testing internal combustion engines In a method and apparatus for the evaluation of a starter motor current or of a magnitude proportional to it for determining the relative compressions of the cylinders of an internal combustion engine, in order to eliminate the distortion of the compressi... | 03/07/1989 |
| 4757463 | Fault isolation for vehicle using a multifunction test probe In a computerized automotive vehicle diagnostic system, a test probe cable is attached to individual components and consists of a multiple conductor cable which is attached ultimately to the component and to a computer in a technician terminal. Where the ... | 07/12/1988 |
| 4587839 | Top dead center measurement for reciprocating crank mechanism A method or system for measuring the top dead center for a reciprocating crank mechanism, in which a reversible counter performs the additive counting operation from an amount H of shift of the piston of the reciprocating crank mechanism to another amount... | 05/13/1986 |
| 4557141 | Method for diagnosing faults in electronic fuel control systems A method of troubleshooting, with a test set, an electronic fuel control system in an aircraft includes disconnecting the electronic engine control after mechanical tests have verified that the faults do not exist in the hydromechanical unit or associated... | 12/10/1985 |
| 4505152 | Method and apparatus for measuring engine compression ratio A method and apparatus for measuring compression ratio and/or clearance volume in an internal combustion engine cylinder wherein the crankshaft angle associated with piston top dead center position is obtained and cylinder pressure is measured at a number... | 03/19/1985 |
| 4483185 | Apparatus for checking valve clearance of the inlet and exhaust of a piston engine An extraneously driven piston engine is fitted in the region of its valve ar with solid-borne vibration pick-ups which are connected to a processor unit. An angle-mark transmitter on the crank assembly controls a gate circuit which within specified zones ... | 11/20/1984 |
| 4483184 | Automatic diagnostic device for a four-stroke-internal combustion engine Three impulse transmitters are provided of which one co-acts with an impu mark on the flywheel, another with an impulse mark on the camshaft drive wheel and a third with the teeth of the ring gear on the flywheel of the engine. The impulse mark on the fl... | 11/20/1984 |
| 4453402 | Method and apparatus for determining the position of a piston in the cylinder of a reciprocating engine The normal procedure for determining top-dead-center (T.D.C.) of a reciprocating engine involves slowly rotating the crankshaft of the engine until the maximum uppermost position (T.D.C.) of the piston in the cylinder has been attained and then inserting ... | 06/12/1984 |
| 4448063 | Engine cold testing Disclosed is a method and apparatus for cold testing of typical piston engines to determine their internal integrity and tolerance prior to further testing or use which could be destructive if a defect exists. A source of pressure oil is fed to the normal... | 05/15/1984 |
| 4375672 | Engine analyzer During analysis, sensors are connected to portions of an engine and thereabout and a starter driven by an auxiliary battery incorporated in a system. An engine of a motor car and electrical systems thereabout are automatically diagnosed by use of a comput... | 03/01/1983 |
| 4361870 | Microprocessor circuit providing vehicle parameter test data The microprocessor production instrumentation package (MPIP) is an electronic testing device used in railway vehicles operated on a test track to insure that the vehicles meet rigid operational specifications. The testing device provides vehicle data rega... | 11/30/1982 |
| 4337515 | Automotive engine analyzer for indicating a no-connection condition of engine test leads A voltage divider network comprising three series connected resistors serve to reference a test signal lead connectable to an internal combustion engine, with respect to ground for providing a voltage test signal on an output conductor representative of t... | 06/29/1982 |
| 4309900 | Apparatus for measurement and display of relative compression by cylinder An engine tester for determining relative compression by cylinder is disclosed. The tester includes a processor which samples starter current in response to input signals based upon engine cylinder firings. The processor correlates the starter current dat... | 01/12/1982 |
| 4291382 | Relative manifold vacuum of an internal combustion engine The instantaneous values of intake manifold vacuum in an internal combustion (IC) engine running under load are measured to provide an indication of the relative performance and relative suction ability of each cylinder in the engine. The instantaneous va... | 09/22/1981 |
| 4291383 | Spark plug load testing for an internal combustion engine The spark voltage waveform at the secondary of the ignition coil of an internal combustion (IC) engine is sensed over a plurality of successive engine cycles. The instantaneous sub-cyclic position of the engine crankshaft is measured at successive cranksh... | 09/22/1981 |
| 4274144 | Fuel control system development apparatus Apparatus for use in developing and testing a control system for an internal combustion automobile engine. A housing is located in the automobile where it can be visually observed by an operator of the automobile. Electrical circuitry is installed in the ... | 06/16/1981 |
| 4144746 | Method for determining a measurement value proportional to the compression of an internal combustion engine A method for determining a measurement value proportional to the compression of an internal combustion engine, derived from the starter current, in which the a-c component of the starter current is integrated over the time between successive current minim... | 03/20/1979 |
| 4125894 | Engine test and display apparatus The disclosure describes an improved automated engine diagnosing device employing a digital data processor computer and a cathode ray tube display monitor which displays engine parameter (i.e., condition) values in alphabetic, numeric, and graphical form.... | 11/14/1978 |
| 4113980 | Vehicle diagnostic hand control A lightweight, somewhat book-shaped control unit having displays, signal lights, data entry keys, and control keys disposed in a panel has one side edge of the case rounded to permit holding in the hand in a fashion that allows pressing of a data entry ke... | 09/12/1978 |
| 4062232 | Testing compression in engines from starter motor current waveform The relative compression in the cylinders of an internal combustion engine is tested by analyzing the starter motor current waveform when the engine is cranked with the ignition or the fuel inhibited. In asymmetrical engines, where the compression strokes... | 12/13/1977 |
| 4050297 | Measuring electrical parameters of an internal combustion engine during cranking Diagnostic apparatus, connected to probes for sensing conditions or parameters of an internal combustion engine during non-combustion cranking of the engine, reads electrical conditions at times related to the crank angle of the engine. Electrical tests a... | 09/27/1977 |
| 4027532 | Compression testing apparatus The disclosure describes apparatus for determining the relative compression of the chambers of an internal combustion engine by analyzing the voltage or current waveform of the starter system during cranking. The waveform is rapidly and repetitively sampl... | 06/07/1977 |
| 3952586 | Determining engine compression from starter motor current Satisfactory or unsatisfactory engine compression is diagnosed by comparing the amplitude of the starter motor current, when cranking an engine having its ignition inhibited, with a reference value. The reference value is adjusted in accordance with the i... | 04/27/1976 |
| 3938378 | Engine compression testing A method of testing compression capabilities of multi-cylinder engines wh are cranked with electrically-energized starter motors. The cylinders are prevented from firing, and the engine is cranked by the starter motor. During the cranking period measurem... | 02/17/1976 |
