METHOD FOR DRIVING A HYBRID TRACTION CHAIN BASED ON THE BATTERY CHARGE STATE
First Claim
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.
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Abstract
The invention relates to a method that comprises the following steps: —a first step (1) of acquiring the acceleration desire of the driver for determining the power for the corresponding wheel (Pwheel), of acquiring the charge state level of the battery (SOC) between a minimum authorised threshold (SOCmin) and a maximum authorised threshold (SOCmax) for a predetermined traction mode, and of acquiring the available braking power (Pfrein) for deciding between an electric or dissipative braking; a second step (2) of managing the charge state (SOC) for, on the basis of a first minimum threshold (SOC1 bmin) of the battery charge state (SOC), of a second minimum threshold (SOC2 bmin) of the battery charge state (SOC) higher than the first one and of the wheel power (Pwheel) requested by the driver, either imposing a battery recharge or setting input parameters for the traction mode selection; and a third step (3) of selecting the traction mode, based on the battery power actually available (Pbat), on the traction power of the wheel requested by the driver (Pwheel), and on the maximum power available at the output of the thermal engine (Pmthmax), for selecting the traction mode that is most adapted to the actual situation of the vehicle.
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Citations
11 Claims
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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:
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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), and when 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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification