| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a road surface friction coefficient estimating device whereby from detected wheel acceleration, a road surface friction coefficient can be surely estimated, and reliability of the estimated road surface friction coefficient can be ensured. SOLUTION: In a road surface friction coefficient estimating device applied for an automobile, from a detected speed of a drive wheel, wheel acceleration is calculated, in a decision block 30, based on a maximum value of the wheel acceleration and detected maximum throttle opening,μdecision value is decided in a map. In a decision block 46, based on a high or lowμdegree decided from theμdecision value, estimationμis decided. Further, when theμdecision value is an ambiguous value, in aμdecision counter 38, a value of high or lowμdegree is adjusted, the same ambiguous value is input by a plurality of times continued, when a value of high or lowμdegree respectively leads to 5, estimationμis decided in the decision block 46, the final estimation result is obtained.</p> |
