Abstract
We studied two methods for road slope estimation on running vehicles with automatic transmissions with regards to avoiding shift change trouble when running uphill and downhill. One is an acceleration sensor method and the other is a kinetic equation method. The former is expected to estimate road slope more accurately than the latter, but the former is more expensive because an additional acceleration sensor is needed. The two methods were compared experimentally. The latter could estimate road slope accurately enough to avoid the shift change trouble.