 Controlling the trace of a rotary head |
| In accordance with this invention, a method and apparatus are provided for controlling the position ... |
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| Scan tracking apparatus for helical scan video tape recorder |
| Therefore, it is an object of the present invention to provide a scan tracking apparatus for a ... |
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| Correction circuits for projection television |
| It is therefore an object of the present invention to provide correction circuits for a projection ... |
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| Vertical image correction for projection TV |
| We claim: 1. In a projection television having a projecting screen and at least one cathode ray ... |
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| Disk loading mechanism for recording and reproducing apparatus |
| Accordingly, it is the main object of the present invention to provide a recording and reproducing ... |
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| Disc player having disc stabilizing apparatus |
| What is claimed is: 1. In a record player for recovering prerecorded information from a disc record ... |
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| Tape cassette loading system |
| I claim as my invention: 1. In apparatus for loading and releasing cassettes of magnetic tape, for ... |
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| Differential signal decoders |
| According to a first aspect, the present invention consists in a differential signal decoder ... |
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| Disk file machine with cable connection to transducers |
| It is an object of the present invention to provide an improved machine for using such diskettes ... |
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| Apparatus for shifting the magnetic read/write head carriage in a floppy disk drive unit |
| It is an object of the present invention to provide a stepper motor and lead screw for a floppy ... |
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Device and method of fail-safe control for electronically controlled automatic transmission
| Details |
Inventors: Ito, Yasunobu; Suzuki, Kenji;
Assignee: Aisin AW Kabushiki Kaisha (JP)
Primary Examiner: Diehl; Dwight
Assistant Examiner:
Attorney, Agent or Firm: Lorusso & Loud
In a fail-safe control device for an electronically controlled automatic transmission to be mounted on a vehicle, a sensor for the number of revolution input to a T/M is newly provided for the electronically controlled automatic transmission, and an actual gear ratio of the T/M is calculated in accordance with the number of revolution input to the T/M and the number of revolution output from the T/M or the car speed. If the calculated actual gear ratio is coincided with the formal gear ratio, it is determined that the state is normal, while if they are not coincided with each other, it is determined that the T/M is in a failure state. As a result of this, failure detection of the T/M is performed. Therefore, in a case when the T/M is in a failure state, a driver can take a measure, for exmple, by performing an emergency control. Furthermore, the occurrence of the failure can be displayed by a detected failure displaying device so that the driver can take a measure such as a repair. |
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DETAILED DESCRIPTION An object of the present invention is to provide a device and a method of fail-safe control for an electronically controlled automatic transmission in which failures in the mechanical portion of an automatic transmission can be detected accurately and the fact of the failure is accurately communicated to a driver so that a reliable fail-safe control can be provided.
In order to achieve the above-described object, the present invention provides, in a fail-safe control device for an electronically controlled automatic transmission: a sensor for detection of the number of revolutions input to the transmission; a sensor for the number of revolutions output from the transmission or a car speed sensor; means for calculating an actual gear ratio in accordance with the sensed number of input revolutions, and the sensed number of output revolutions or the car speed obtained from the car speed sensor; means for obtaining a formal gear ratio; and means for detecting failures in a mechanical portion of the transmission by making a comparison between the formal gear ratio and the thus-calculated gear ratio are provided.
Furthermore, the invention provides a fail-safe control method for an electronically controlled automatic transmission, including: measuring the number of revolutions input to the transmission from a sensor for the number of revolutions input to the transmission; measuring the number of revolutions output from the transmission from a sensor for the number of revolutions output from the transmission or a car speed sensor; calculating an actual gear ratio in accordance with the number of revolutions input to the transmission and the number of revolutions output from the transmission or the car speed; obtaining a formal gear ratio; comparing the formal gear ratio and the thus-calculated gear ratio; and detecting a failure in the mechanic portion of the transmission if the formal gear ratio and the calculted gear ratio do not coincide.
In automatic transmissions, the formal gear ratio is, in general, defined in accordance with the position of the shift lever and the state of the output from the shift solenoid
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Exercise Devices 
