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US 8,137,235 B2Granted
Braking method and device with energy recovery in particular for a vehicle equipped with hybrid traction system
AssigneeIveco S.P.A.
InventorsMarco Aimo Boot, Mauro Colombano, Marco Imarisio, Stefano Salio
Life of this patent
Estimating the term…
Abstract
A braking method and device with energy recovery for a hybrid traction vehicle, which, according to the requested braking target, regulates the intervention of the engine-generator and the connection or disconnection of the endothermic engine from the transmission line.
Claims8
Braking method with energy recovery for a vehicle equipped with hybrid traction system and service brakes, said hybrid traction system comprising:
- at least a thermal engine (MT), able to provide a first braking torque (EF) deriving from engine friction and a second braking torque (EB) deriving from one or more additional braking systems, operating on the thermal engine, a transmission, or both the thermal engine and the transmission;
- at least an electric engine-generator (ME), connected to one or more battery systems (BAT), able to provide a third braking torque (MTG) if functioning as a generator, wherein said braking method comprises:
- a determination step of a braking torque overall value which considers said first, second and third braking torque, and which gives the priority to the contribution of said third braking torque (MTG) for the highest energy recovery wherein said determination step of a braking torque overall value comprising:
- the deactivation of said thermal engine (MT), if said electric engine-generator (ME) is able to obtain said braking torque overall value by means of only said third braking torque (MTG);
- the activation of said thermal engine (MT), if said electric engine-generator (ME) is not able to obtain said braking torque overall value by means of only said third braking torque (MTG), generating at least said first braking torque (EF) so that said braking torque overall value comprises said first and third braking torque;
- the activation of said additional braking system operating on the thermal engine or on the transmission, so that said additional braking system is able to generate also said second braking torque (EB), so that said braking torque overall value comprises said first, second and third braking torque;
- and
- an activation or deactivation step of the contribution given from said second braking torque (EB) according to a preselection (PRES) of three options:
- first option (0):
- additional braking system deactivated;
- second option (1):
- additional braking system activated by the pressure on the service brake pedal;
- third option (2):
- additional braking system activated by the release of the service brake pedal.
11 more elements
Braking device with energy recovery for a vehicle equipped with hybrid traction system and service brakes, said hybrid traction system comprising:
- at least a thermal engine (MT), able to provide a first braking torque (EF) given by engine friction and a second braking torque (EB) given by one or more additional braking systems operating on the thermal engine, the transmission, or both the thermal engine and the transmission,
- at least an electric engine-generator (ME), connected to a traction battery system (BAT), able to provide a third braking torque (MTG) if functioning as a generator,
- wherein said braking device comprises at least an electronic control unit (ECU) suitable to perform a braking method with energy recovery comprising:
- a determination step of a braking torque overall value which considers said first, second and third braking torque, and which gives the priority to the contribution of said third braking torque (MTG) for the highest energy recovery wherein said determination step of a braking torque overall value comprising:
- the deactivation of said thermal engine (MT), if said electric engine-generator (ME) is able to obtain said braking torque overall value by means of only said third braking torque (MTG);
- the activation of said thermal engine (MT), if said electric engine-generator (ME) is not able to obtain said braking torque overall value by means of only said third braking torque (MTG), generating at least said first braking torque (EF) so that said braking torque overall value comprises said first and third braking torque;
- the activation of said additional braking system operating on the thermal engine or on the transmission, so that said additional braking system is able to generate also said second braking torque (EB), so that said braking torque overall value comprises said first, second and third braking torque;
- and
- an activation or deactivation step of the contribution given from said second braking torque (EB) according to a preselection (PRES) of three options:
- first option (0):
- additional braking system deactivated;
- second option (1):
- additional braking system activated by the pressure on the service brake pedal:
- third option (2):
- additional braking system activated by the release of the service brake pedal.
12 more elements
Dependencies are inferred from the claim text.