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Operation of vehicular automatic transmission with microprocessor control - involves inhibition of changes into higher ratio on down grades where predetermined data deviation limits are exceeded
Operation of vehicular automatic transmission with microprocessor control - involves inhibition of changes into higher ratio on down grades where predetermined data deviation limits are exceeded
Known data, specific to the vehicle, are preascertained in running on the level for each available transmission ratio. These data relate road speed to engine speed on the one hand, and to accelerator pedal position on the other hand. In running over graded roads the actual instanteneous data for the engaged transmission ratio are compared continuously with the known data. Deviations beyond a predetermined order of magnitude are used to override higher-ratio selection. ADVANTAGE - Downhill running is improved with changing-up counteracted or prevented for optimal use of engine brakingtim
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