Method and control apparatus for recuperating energy in a hybrid vehicle
First Claim
1. A method for recuperating energy in a hybrid vehicle having an internal combustion engine, an electrical machine, an automatic stop/start apparatus configured to be automatically turned off and start the internal combustion engine under predetermined conditions, and an on-board electrical system with an energy store configured to be charged with electrical energy by the electrical machine during a recuperation operation, comprising:
- (a) setting a recuperation power (P_act) for the recuperation operation of the electrical machine to a first value (P_max) which allows the recuperation operation with a maximum generator capacity of the electrical machine if an actual energy level (E_act) of the energy store is lower than or equal to a threshold value (E_3);
(b) setting the recuperation power (P_act) for the recuperation operation of the electrical machine to a second value (P_lim) which is lower than the first value (P_max) and allows the recuperation operation with a reduced generator capacity of the electrical machine if the actual energy level (E_act) of the energy store is greater than the threshold value (E_3); and
(c) predicting a predicted recuperation energy (E_rec) for an actual operating state of the hybrid vehicle, the predicted recuperation energy indicating how much energy would be able to be recuperated if the hybrid vehicle were to be braked starting from a current driving state at least to a speed threshold value (v_min).
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Accused Products
Abstract
A method and apparatus for recuperating energy in a hybrid vehicle, having an internal combustion engine an electrical machine, and on-board electrical system with an energy store that can be charged with electrical energy during a recuperation operation. A recuperation power for a recuperation operation of the electrical machine is set to a first value that allows a recuperation operation with a maximum generator capacity of the electrical machine if an actual energy level of the energy store is lower than or equal to a threshold value. However, the recuperation power for a recuperation operation is set to a second value lower than the first value and allows a recuperation operation with a reduced generator capacity of the electrical machine if the actual energy level of the energy store is greater than the threshold value.
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Citations
14 Claims
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1. A method for recuperating energy in a hybrid vehicle having an internal combustion engine, an electrical machine, an automatic stop/start apparatus configured to be automatically turned off and start the internal combustion engine under predetermined conditions, and an on-board electrical system with an energy store configured to be charged with electrical energy by the electrical machine during a recuperation operation, comprising:
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(a) setting a recuperation power (P_act) for the recuperation operation of the electrical machine to a first value (P_max) which allows the recuperation operation with a maximum generator capacity of the electrical machine if an actual energy level (E_act) of the energy store is lower than or equal to a threshold value (E_3); (b) setting the recuperation power (P_act) for the recuperation operation of the electrical machine to a second value (P_lim) which is lower than the first value (P_max) and allows the recuperation operation with a reduced generator capacity of the electrical machine if the actual energy level (E_act) of the energy store is greater than the threshold value (E_3); and (c) predicting a predicted recuperation energy (E_rec) for an actual operating state of the hybrid vehicle, the predicted recuperation energy indicating how much energy would be able to be recuperated if the hybrid vehicle were to be braked starting from a current driving state at least to a speed threshold value (v_min). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for controlling a recuperation operation in a hybrid vehicle, which hybrid vehicle includes an internal combustion engine, an electrical machine and an automatic stop/start apparatus configured to automatically turned off and start the internal combustion engine under predetermined conditions, and an on-board electrical system comprising an energy store configured to be charged with electrical energy by the electrical machine during the recuperation operation, wherein the apparatus is configured to:
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(a) set a recuperation power (P_act) for the recuperation operation of the electrical machine to a first value (P_max) which allows the recuperation operation with a maximum generator capacity of the electrical machine if an actual energy level (E_act) of the energy store is lower than or equal to a threshold value (E_3); (b) set the recuperation power (P_act) for the recuperation operation of the electrical machine to a second value (P_lim) which is lower than the first value (P_max) and allows the recuperation operation with a reduced generator capacity of the electrical machine if the actual energy level (E_act) of the energy store is greater than the threshold value (E_3); and (c) predicting a predicted recuperation energy (E_rec) for an actual operating state of the hybrid vehicle, the predicted recuperation energy indicating how much energy would be able to be recuperated if the hybrid vehicle were to be braked starting from a current driving state at least to a speed threshold value (v_min).
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14. A motor vehicle comprising:
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an internal combustion engine; an electrical machine; an automatic stop/start apparatus configured to be automatically turned off and start the internal combustion engine under predetermined conditions; an on-board electrical system comprising an energy store configured to be charged with electrical energy by the electrical machine during the recuperation operation; and an apparatus for controlling the recuperation operation configured to; (a) set a recuperation power (P_act) for the recuperation operation of the electrical machine to a first value (P_max) which allows the recuperation operation with a maximum generator capacity of the electrical machine if an actual energy level (E_act) of the energy store is lower than or equal to a threshold value (E_3); (b) set the recuperation power (P_act) for the recuperation operation of the electrical machine to a second value (P_lim) which is lower than the first value (P_max) and allows the recuperation operation with a reduced generator capacity of the electrical machine if the actual energy level (E_act) of the energy store is greater than the threshold value (E_3); and (c) predicting a predicted recuperation energy (E_rec) for an actual operating state of the hybrid vehicle, the predicted recuperation energy indicating how much energy would be able to be recuperated if the hybrid vehicle were to be braked starting from a current driving state at least to a speed threshold value (v_min).
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Specification