Anti-rollback control for hybrid and conventional powertrain vehicles
AssigneeGM Global Technology Operations LLC
InventorsGoro Tamai, Birendra P. Bhattarai, Tony T. Hoang
Life of this patent
Estimating the term…
Abstract
An anti-rollback vehicle control system reduces vehicle rollback by restarting an engine based on a grade, a brake signal, and a calculated brake release rate. In a hybrid vehicle, the control system restarts the vehicle engine and electric motor. In a conventional powertrain vehicle that utilizes a transmission with a neutral-idle mode, the control system directs the transmission to exit neutral-idle mode. The grade may be estimated based on a vehicle acceleration rate, a vehicle driving force, and resistance factors.
Claims20
A rollback reduction system in a vehicle having an engine, comprising:
- a grade sensor that generates a grade signal;
- a brake sensor that generates a brake signal;
- and
- a control module that calculates a brake release rate based on said brake signal and starts said engine based on said grade signal and said brake release rate.
A rollback reduction system in a vehicle having an engine, comprising:
- a brake sensor that generates a brake signal;
- a vehicle speed sensor that generates a speed signal;
- an engine rotational speed sensor that generates an engine rotational speed signal;
- and
- a control module that calculates a brake release rate based on said brake signal, an acceleration rate based on said speed signal, a driving force based on said engine rotational speed signal, a braking force based on said brake signal, and a grade estimate based on a predetermined vehicle mass, said acceleration rate, said driving force, and said braking force and that starts said engine based on said grade estimate and said brake release rate.
A method for reducing rollback of a vehicle having an engine, said method comprising:
- determining a grade;
- receiving a brake signal;
- calculating a brake release rate based on said brake signal;
- and
- starting said engine based on said grade and said brake release rate.
Dependencies are inferred from the claim text.