Hybrid drive system for a motor vehicle
First Claim
1. A hybrid drive system for a vehicle, the hybrid drive system comprising:
- an internal combustion engine;
an electric machine operable as an electric motor and a generator;
a transmission having a continuously variable ratio;
a first clutch coupling the internal combustion engine with the electric machine;
a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle;
an electric energy accumulator;
a converter device for controlling energy flow between the electric machine and the electric energy accumulator;
an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch;
wherein, during the starting of the internal combustion engine while driving the continuously variable ratio of the transmission is stepped down during the closing of the first clutch.
1 Assignment
0 Petitions
Accused Products
Abstract
A hybrid drive system for a vehicle, comprising an internal-combustion engine, a generator, an electric motor, an electric energy accumulator, and a connection device for establishing mechanical connections between the internal-combustion engine, the generator, the electric motor and the vehicle, and a control device. The control device controls a converter device and, as required, the connection device such that the internal-combustion engine is used exclusively for driving the vehicle only if it operable in an operating range in which the operation could also take place only with an electromotive drive, with a specific fuel consumption ESVE lower than ESVL/(G×B×M), wherein ESVL is the effective specific fuel consumption with which the generator was driven during the charging of the energy stored in the electric energy accumulator, G is the efficiency with which the generator converts the mechanical driving power into electric power, B is the efficiency with which the electric power generated in the generator is stored as energy in the electric energy accumulator and is supplyable to the driving motor, and M is the efficiency with which the electric power in the driving motor is convertible into mechanical energy.
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Citations
30 Claims
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1. A hybrid drive system for a vehicle, the hybrid drive system comprising:
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an internal combustion engine; an electric machine operable as an electric motor and a generator; a transmission having a continuously variable ratio; a first clutch coupling the internal combustion engine with the electric machine; a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle; an electric energy accumulator; a converter device for controlling energy flow between the electric machine and the electric energy accumulator; an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch; wherein, during the starting of the internal combustion engine while driving the continuously variable ratio of the transmission is stepped down during the closing of the first clutch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A hybrid drive system for a vehicle, the hybrid drive system comprising:
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an internal combustion engine; an electric machine operable as an electric motor and a generator; a transmission having a variable ratio; a first clutch coupling the internal combustion engine with the electric machine; a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle; an electric energy accumulator; a converter device for controlling energy flow between the electric machine and the electric energy accumulator; an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch; wherein, during the starting of the internal combustion engine, at least one of the following actions take place; (a) operation of the electric machine with an additional drive torque during the closing of the first clutch, and (b) reduction of the ratio of the transmission during the closing of the first clutch; wherein the control device is adapted to control the converter device and, as required, the first and second clutches such that the internal-combustion engine is used exclusively for driving the vehicle only if it is in an operating range in which the operation could also take place only with an electromotive drive, with a specific fuel consumption ESVE lower than ESVL/(G×
B×
M), wherein;ESVL is an effective specific fuel consumption with which the generator was driven during the charging of the energy stored in the electric energy accumulator, G is the efficiency with which the generator converts the mechanical driving power into electric power, B is the efficiency with which the electric power generated in the generator is stored as energy in the electric energy accumulator and is supplyable to the drive motor, and M is the efficiency with which the electric power in the drive motor is convertible into mechanical energy; and wherein the control device is adapted to control the system such that, during the charging of the energy accumulator, the generator is driven as close as possible to its rated power by the internal-combustion engine running corresponding to the required power output with the lowest possible specific fuel consumption.
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27. A hybrid drive system for a vehicle, the hybrid drive system comprising:
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an internal combustion engine; an electric machine operable as an electric motor and a generator; a transmission having a variable ratio; a first clutch coupling the internal combustion engine with the electric machine; a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle; an electric energy accumulator; a converter device for controlling energy flow between the electric machine and the electric energy accumulator; an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch; wherein, during the starting of the internal combustion engine, at least one of the following actions take place; (a) operation of the electric machine with an additional drive torque during the closing of the first clutch, and (b) reduction of the ratio of the transmission during the closing of the first clutch; wherein the control device is adapted to control the converter device and, as required, the first and second clutches such that the internal-combustion engine is used exclusively for driving the vehicle only if it is in an operating range in which the operation could also take place only with an electromotive drive, with a specific fuel consumption ESVE lower than ESVL/(G×
B×
M), wherein;ESVL is an effective specific fuel consumption with which the generator was driven during the charging of the energy stored in the electric energy accumulator, G is the efficiency with which the generator converts the mechanical driving power into electric power, B is the efficiency with which the electric power generated in the generator is stored as energy in the electric energy accumulator and is supplyable to the drive motor, and M is the efficiency with which the electric power in the drive motor is convertible into mechanical energy; and wherein the control device comprises; a first memory device for storing a characteristic fuel consumption diagram which specifies the specific fuel consumption of the internal-combustion engine as a function of the power and the rotational speed of the internal-combustion engine, a second memory device for storing the respective value of ESVE, and an arithmetic-logic device which, based on the current drive power demand of the vehicle, the current vehicle speed and the available transmission ratios between the internal-combustion engine and the vehicle is adapted to compute the minimal specific fuel consumption with which the internal-combustion engine can drive the vehicle at the instantaneous drive power demand.
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28. A hybrid drive system for a vehicle, the hybrid drive system comprising:
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an internal combustion engine; an electric machine operable as an electric motor and a generator; a transmission having a variable ratio; a first clutch coupling the internal combustion engine with the electric machine; a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle; an electric energy accumulator; a converter device for controlling energy flow between the electric machine and the electric energy accumulator; an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch; wherein, during the starting of the internal combustion engine, at least one of the following actions take place; (a) operation of the electric machine with an additional drive torque during the closing of the first clutch, and (b) reduction of the ratio of the transmission during the closing of the first clutch; wherein the control device is adapted to control the converter device and, as required, the first and second clutches such that the internal-combustion engine is used exclusively for driving the vehicle only if it is in an operating range in which the operation could also take place only with an electromotive drive, with a specific fuel consumption ESVE lower than ESVL(G×
B×
M), wherein;ESVL is an effective specific fuel consumption with which the generator was driven during the charging of the energy stored in the electric energy accumulator, G is the efficiency with which the generator converts the mechanical driving power into electric power, B is the efficiency with which the electric power generated in the generator is stored as energy in the electric energy accumulator and is supplyable to the drive motor, and M is the efficiency with which the electric power in the drive motor is convertible into mechanical energy; and wherein the rated driving power of the generator corresponds to the power which the internal-combustion engine supplies at a predetermined specific fuel consumption and the corresponding lowest rotational speed.
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29. A hybrid drive system for a vehicle, the hybrid drive system comprising:
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an internal combustion engine; an electric machine operable as an electric motor and a generator; a transmission having a variable ratio; a first clutch coupling the internal combustion engine with the electric machine; a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle; an electric energy accumulator; a converter device for controlling energy flow between the electric machine and the electric energy accumulator; an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch; wherein, during the starting of the internal combustion engine, at least one of the following actions take place; (a) operation of the electric machine with an additional drive torque during the closing of the first clutch, and (b) reduction of the ratio of the transmission during the closing of the first clutch; wherein the control device is adapted to control the converter device and, as required, the first and second clutches such that the internal-combustion engine is used exclusively for driving the vehicle only if it is in an operating range in which the operation could also take place only with an electromotive drive, with a specific fuel consumption ESVE lower than ESVL/(G×
B×
M), wherein;ESVL is an effective specific fuel consumption with which the generator was driven during the charging of the energy stored in the electric energy accumulator, G is the efficiency with which the generator converts the mechanical driving power into electric power, B is the efficiency with which the electric power generated in the generator is stored as energy in the electric energy accumulator and is supplyable to the drive motor, and M is the efficiency with which the electric power in the drive motor is convertible into mechanical energy; and wherein the rated driving power of the generator corresponds at least to the power which the internal-combustion engine maximally supplies at its lowest permissible loaded rotational speed.
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30. A hybrid drive system for a vehicle, the hybrid drive system comprising:
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an internal combustion engine; an electric machine operable as an electric motor and a generator; a transmission having a variable ratio; a first clutch coupling the internal combustion engine with the electric machine; a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle; an electric energy accumulator; a converter device for controlling energy flow between the electric machine and the electric energy accumulator; an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch; wherein, during the starting of the internal combustion engine, at least one of the following actions take place; (a) operation of the electric machine with an additional drive torque during the closing of the first clutch, and (b) reduction of the ratio of the transmission during the closing of the first clutch; wherein the control device is adapted to control the converter device and, as required, the first and second clutches such that the internal-combustion engine is used exclusively for driving the vehicle only if it is in an operating range in which the operation could also take place only with an electromotive drive, with a specific fuel consumption ESVE lower than ESVL/(G×
B×
M), wherein;ESVL is an effective specific fuel consumption with which the generator was driven during the charging of the energy stored in the electric energy accumulator, G is the efficiency with which the generator converts the mechanical driving power into electric power, B is the efficiency with which the electric power generated in the generator is stored as energy m the electric energy accumulator and is supplyable to the drive motor, and M is the efficiency with which the electric power in the drive motor is convertible into mechanical energy; and wherein the rated motor power is at least approximately as large as the rated generator power multiplied by the product of B and M.
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Specification