Vehicle speed control system and method
US6178371A · kind A · utility
69Cited by
20References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1999 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Apr 12, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2250/18
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A speed control method for vehicles having an internal combustion engine smoothly controls engine torque to control vehicle speed. Torque is controlled via airflow in a first torque control range. Torque is controlled via a coordination of air/fuel ratio, ignition timing, and cylinder deactivation is a second torque control range. The torque range is selected based on the required airflow to deliver the required torque. If the required airflow is less than a lower allowable value, then the airflow is fixed at this lower allowable value and the second range is selected. Otherwise, the first range is selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.