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Electric Tachometer Specification http://www.sae.org This SAE recommended practice establishes minimum requirements for electric tachometer systems with and without hour/meter or revolution counter, for general applications as follows: Class 1-Passenger Car Class 2-Bus and Truck Class 3-Off Road Vehicles. |
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General Qualification and Production Acceptance Criteria for
Integrated Circuits in Automotive Applications http://www.sae.org This document establishes the general environmental, mechanical and quality requirements pertaining to IC's. It also describes the qualification and production acceptance procedures performed by the supplier. It is to be used as a guideline which device buyers can apply wholly or in part as appropriate for their needs and applications. This document is essentially part number independent. The detail specification particular to a device part number will be given separately, containing all detailed electrical and mechanical parameters. |
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Software Reliability Program Standard http://www.sae.org This SAE standard provides a framework for the management of software reliability within system reliability requirements. It is based around the Software Reliability Plan and Software Reliability Case and emphasizes the importance of evaluating progress towards meeting software reliability requirements throughout the project life cycle. Range of Application-This document can be applied to all projects that incorporate software. This includes the integration of off the shelf (OTS) software products and custom software. |
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Automotive Speedometers and Tachometers http://www.sae.org This SAE recommended practice applies to speedometers, odometers, and speedometer drives typical of passenger vehicles, buses, and trucks used for personal or commercial purposes. The method of determining wheel revolutions per unit distance and overall system design variation are applicable to passenger cars only. Comparable recommendations for trucks and buses are under development. The data of tachometers is applicable to vehicular use, as previously described, and also to stationary and marine engines and special vehicles. |
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Electromagnetic Compatibility Measurements Procedure for Vehicle Components http://www.sae.org Vehicle electrical/electronic systems may be affected when immersed in an electromagnetic field generated by sources such as radio and TV broadcast stations, radar and communication sites, mobile transmitters, cellular phones, etc. Reverberation method is used to evaluate the immunity of electronic devices in the frequency range of 500MHz to 2.0 GHz, with possible extensions to 200 MHz to 10GHz. At a later date, pulse modulation capability will be added for testing above 1 GHz. This document provides the component design and test engineers with a test procedure and the performance requirements necessary to evaluate the immunity of electronic devices to radiated electromagnetic fields early in the design stage as well as pilot and production stages. |
| Title: US Pat #: Location: Summary: |
Transmission gear position dependent output control system for automotive
internal combustion engine US5048372 http://patent.womplex.ibm.com An engine output characteristics control system includes means for monitoring a selection of speed ratios of a power transmission to provide information concerning transmission gear position. The control system receives transmission gear position information to detect selection of a specific speed ratio of the transmission for providing information indicative of the selection of the specific transmission gear position. The control system is responsive to the specific transmission gear position selection indicative information for deriving an engine control signal for controlling the engine output characteristics so that the engine output is adapted to the specific speed ratio. |
| Title: US Pat #: Location: Summary: |
Apparatus for detecting a neutral state of a transmission gear of a vehicle
engine system US4803898 http://www.nssn.org An apparatus for detecting a neutral state of a transmission gear of a vehicle detects an engine rotational speed, a vehicle speed, and a condition in which the engine output power is transmitted to the transmission gear through a clutch. The apparatus judges that the transmission gear is in the neutral state when a ratio between the engine rotational speed and the vehicle speed is in any one of predetermined ranges. The apparatus also judges that the transmission gear is in the neutral state when a variation of the ratio between the engine rotational speed and the vehicle speed within a predetermined time period is greater than a predetermined value. |
| Title: US Pat #: Location: Summary: |
High Performance Tachometer US5905374 http://patent.womplex.ibm.com A high performance tachometer for use in high performance racing vehicles, such as dragsters, is disclosed. The tachometer has an input signal indicative of the vehicular engine speed and an output display for displaying the instantaneous engine speed as indicated by the input signal. The tachometer includes input controls for directing the control and operation of the tachometer. Special features associated with the tachometer include a memory device configured to store the value of the input signal at periodic and discrete time intervals, as directed by the input controls; a special event detector configured to detect a certain predetermined event or pattern of the input signal as determined by monitoring the output of the memory device, the special event detector being further configured to halt or freeze the output display (both deflection needle and digital readout) upon detection of the predetermined event or pattern output from the memory device; a multi-stage RPM switch is included to operatively control a plurality of controlled devices. The system is designed to allow the user to program the RPM switch to operate the controlled devices at a plurality of engine speeds. In addition, an automatic starting feature is provided. The automatic starting feature of a preferred embodiment is initiated in connection with the activation of the Line-Loc switch. |