×

METHOD FOR DRIVING A HYBRID TRACTION CHAIN BASED ON THE BATTERY CHARGE STATE

  • US 20100280694A1
  • Filed: 09/30/2008
  • Published: 11/04/2010
  • Est. Priority Date: 10/03/2007
  • Status: Active Grant
First Claim
Patent Images

1. Control method for a hybrid drive system of a vehicle, in particular a motor vehicle, of the type that comprises various members, including a heat engine and at least one electric drive machine adapted to operate as a motor or as a generator and enabling combustion and/or electric drive modes, a braking system adapted to implement regenerative and/or dissipative braking, and a battery with a set nominal electric power (bat), which method comprises the following steps:

  • a first step of obtaining the acceleration request of the driver in order to determine the corresponding power at the wheel (Pwheel), obtaining the state-of-charge level of the battery (SOC), and obtaining the braking power at the wheel requested by the driver (Pbrake), which makes it possible to decide whether it is appropriate to apply electric or dissipative braking;

    a second step of controlling the state of charge (SOC), comprising, as a function of a battery recharge requirement status indicator (Pmin),when the power requested at the wheel (Pwheel) is greater than the maximum power available from the heat engine (Pengmax) calculating the available battery power (Pbat) by multiplying the nominal battery power (bat) by a first battery charge coefficient (Coef1) whose value varies between 0 and 1 according to a first preestablished law, between a first set minimum threshold (SOC1min) of the battery state of charge, which is greater than an allowed minimum threshold (SOCmin), and a first set maximum threshold (SOC1max), which is less than an allowed maximum threshold (SOCmax), andwhen the power requested at the wheel (Pwheel) is less than the maximum power available from the heat engine (Pengmax), calculating the available battery power (Pbat) by multiplying the nominal battery power (bat) by a second battery charge coefficient (Coef2) whose value varies between 0 and 1 according to a second preestablished law, between a second set minimum battery state-of-charge threshold (SOC2min), which is greater than the allowed minimum threshold (SOCmin), and a second set maximum threshold (SOC2max), which is less than the allowed maximum threshold (SOCmax); and

    a third step of choosing the drive mode, which, as a function of the available battery power (Pbat), the drive power at the wheel requested by the driver (Pwheel), and the maximum power available from the heat engine (Pengmax), selects the most appropriate drive mode for the vehicle operating situation.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×