IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0334140
(2011-12-22)
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등록번호 |
US-8706335
(2014-04-22)
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우선권정보 |
DE-10 2011 002 541 (2011-01-12) |
발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
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A method for operating a hybrid unit comprising a first drive-power source, such as a supercharged internal combustion engine, and a second drive-power source, such as an electric machine. The second drive-power source operates as a generator for charging the energy accumulator and as a motor for di
A method for operating a hybrid unit comprising a first drive-power source, such as a supercharged internal combustion engine, and a second drive-power source, such as an electric machine. The second drive-power source operates as a generator for charging the energy accumulator and as a motor for discharging of the energy accumulator. Depending on torque desired by a driver, drive torque can be called for, on the one hand, from the first drive-power source and, on the other hand, from the second drive-power source operating as a motor. When the torque desired by the driver increases, to ensure operation of the hybrid unit with reduced fuel consumption and reduced emissions, depending on the charge condition of the energy accumulator, torque demanded from the first drive-power source is delayed and/or reduced, and the resulting reduced dynamic response is compensated for by demanding torque from the second drive-power source.
대표청구항
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1. A method of operating a hybrid drive unit (1) comprising a first drive-power source (2), in the form of a supercharged internal combustion engine, and a second drive-power source (3), comprising an electric machine which is operable as a generator for charging an energy accumulator (4) that co-op
1. A method of operating a hybrid drive unit (1) comprising a first drive-power source (2), in the form of a supercharged internal combustion engine, and a second drive-power source (3), comprising an electric machine which is operable as a generator for charging an energy accumulator (4) that co-operates therewith and as a motor for discharging the energy accumulator (4), such that as a function of an output torque desired by a driver, a first drive torque can be called for from the first drive-power source (2) and a second drive torque called for from the second drive-power source (3) operating as a motor, the method comprising the steps of: when the driver indicates a desire for an increased output torque, one of: (a) increasing a time span during which the first drive torque reaches the increased output torque desired by the driver in comparison to a first drive torque normally achieved by the supercharged internal combustion engine, in a non-supercharged aspiration to achieve operation of the hybrid unit (1) with reduced fuel consumption and reduced emissions; and(b) decreasing a slope of an initial torque increase by which the first drive torque reaches the increased output torque desired by the driver in comparison to a first drive torque normally achieved by the supercharged internal combustion engine, in a non-supercharged aspiration to achieve operation of the hybrid unit (1) with reduced fuel consumption and reduced emissions; andsupplementing the first drive torque with the second drive torque to achieve the increased output torque and compensate for the increased time span during which the first drive torque reaches the increased output torque desired by the driver or the decreased slope of an initial torque increasing by which the first drive torque reaches the increased output torque desired by the driver when the charge condition of the energy accumulator (4) is high, such that if the increased output torque desired by the driver is increased either stepwise or abruptly, the first drive torque demanded from the first drive-power source (2) is increased with a substantially constant slope to the increased output torque desired by the driver (A to D), at a torque time gradient less than that of a maximum initial time gradient (A to C) that is deliverable by normal engine aspiration without supercharging. 2. The method according to claim 1, wherein the first drive-power source (2) is an exhaust turbo-supercharged diesel engine, and the method further comprising the step of adjusting the torque demand with a combustion air to fuel ratio greater than and not substantially equal to one (λ>>1) for the diesel engine, and for subsequent charging of the energy accumulator (4) by operating the second drive-power source (3) as a generator, operating the diesel engine (2) in either a partially homogeneous or a homogeneous mode. 3. The method according to claim 1, wherein the first drive-power source (2) is an exhaust turbo-supercharged Otto engine with pre-mixing of the combustion air and fuel further, the method further comprising the step of adjusting the torque demand during stratified operation of the Otto engine in which the engine is operated with a combustion air to fuel ratio greater than and not substantially equal to (λ>>1), and for subsequent charging of the energy accumulator (4) by operating the second drive-power source (3) as a generator, carrying out one of an operating point displacement or a shift of the Otto engine in order to operate the Otto engine, while the second drive-power source (3) is operating as a generator, with a combustion air to fuel ratio equal to one (λ=1). 4. The method according to claim 1, wherein the first drive-power source (2) is an exhaust turbo-supercharged Otto engine with direct fuel injection, the method further comprising the step of adjusting the torque demand with a combustion air to fuel ratio equal to one (λ=1) for the Otto engine. 5. A device (5) for controlling a hybrid drive unit (1), which exchanges data, either directly or indirectly, via an interposed further control unit, with a hybrid drive unit (1) comprising a first drive-power source (2), in the form of a supercharged internal combustion engine, and a second drive-power source (3) comprising an electric machine, with an energy accumulator (4) which co-operates with the second drive-power source, and an accelerator pedal (10), to ensure operation of the hybrid drive unit (1) with reduced fuel consumption and reduced emissions, if the accelerator pedal (10) indicates that output torque desired by the driver is increased, as a function of a charge condition of the energy accumulator (4), the control device (5) at least one of (a) increases a time span during which a first drive torque, demanded from and supplied by the first drive-power source (2), reaches the increased output torque desired by the driver in comparison to a first drive torque normally achieved by the supercharged internal combustion engine, in a non-supercharged aspiration to achieve operation of the hybrid unit (1) with reduced fuel consumption and reduced emissions; and(b) decreases a slope of an initial torque increase by which the first drive torque reaches the increased output torque desired by the driver in comparison to a first drive torque normally achieved by the supercharged internal combustion engine, in a non-supercharged aspiration to achieve operation of the hybrid unit (1) with reduced fuel consumption and reduced emissions; andsupplementing the first drive torque with a second drive torque, supplied by the second drive-power source (3), to achieve the increased output torque and compensate for the increased time span during which the first drive torque reaches the increased output torque desired by the driver or the decreased slope of an initial torque increasing by which the first drive torque reaches the increased output torque desired by the driver when the charge condition of the energy accumulator (4) is high, such that if the increased output torque desired by the driver is increased either stepwise or abruptly, the first drive torque demanded from the first drive-power source (2) is increased with a substantially constant slope to the increased output torque desired by the driver (A to D), at a torque time gradient less than that of a maximum initial time gradient (A to C) that is deliverable by normal engine aspiration without supercharging. 6. A control device (5) for controlling a hybrid drive unit (1), which exchanges data, either directly or indirectly, via an interposed further control unit, with a hybrid drive unit (1) comprising a first drive-power source (2) in the form of a supercharged internal combustion engine and a second drive-power source (3) consisting of an electric machine, with an energy accumulator (4) which co-operates with the second drive-power source, and an accelerator pedal (10), for ensuring operation of the hybrid drive unit (1) with reduced fuel consumption and reduced emissions, if the accelerator pedal (10) indicates that torque desired by the driver has been increased, as a function of a charge condition of the energy accumulator (4), the control device (5) at least one of (a) increases a time span during which a first drive torque, demanded from and supplied by the first drive-power source (2), reaches the increased output torque desired by the driver in comparison to a first drive torque normally achieved by the supercharged internal combustion engine, in a non-supercharged aspiration to achieve operation of the hybrid unit (1) with reduced fuel consumption and reduced emissions; and(b) decreases a slope of an initial torque increase by which the first drive torque reaches the increased output torque desired by the driver in comparison to a first drive torque normally achieved by the supercharged internal combustion engine, in a non-supercharged aspiration to achieve operation of the hybrid unit (1) with reduced fuel consumption and reduced emissions; and supplementing the first drive torque with a second drive torque, supplied by the second drive-power source (3), to achieve the increased output torque and compensate for the increased time span during which the first drive torque reaches the increased output torque desired by the driver or the decreased slope of an initial torque increasing by which the first drive torque reaches the increased output torque desired by the driver when the charge condition of the energy accumulator (4) is high, such that if the increased output torque desired by the driver is increased either stepwise or abruptly, the first drive torque demanded from the first drive-power source (2) is increased with a substantially constant slope to the increased output torque desired by the driver (A to D), at a torque time gradient less than that of a maximum initial time gradient (A to C) that is deliverable by normal engine aspiration without supercharging. 7. The method according to claim 1, further comprising a step of achieving the increased output torque desired by the driver (D) in substantially a same time span (“t” at D minus “t” at A) as by normal engine aspiration without supercharging (“t” at D minus “t” at A).
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