Hybrid motor vehicle and method for controlling operation of a hybrid motor vehicle
First Claim
1. A method for controlling an operation of a motor vehicle with a hybrid drive unit, which comprises an internal combustion engine and at least one electric machine coupled to a drive train of the motor vehicle, wherein the at least one electric machine is selectively operated in a motor operation mode and a generator operation mode, wherein, when the electric machine is operated in the motor operation mode, the electric machine powers the motor vehicle either alone or in addition to the internal combustion engine, and, when the electric machine is operated in the generator operation mode, the electric machine charges an energy store and/or powers a vehicle electrical system of the motor vehicle, wherein, when the electric machine is operated in the generator operation mode, depending on maintaining predetermined boundary conditions, the electric machine operates in an alternating generator mode and a continuous generator mode, wherein, when the electric machine is operated in the alternating generator mode, the electric machine is operated in a manner in which first and second intervals are alternated, wherein(a) in a first interval, the electric machine is operated with a first, high electric power output which is greater than an actual power consumption of the vehicle electrical system, and(b) in the second interval, the electric machine is switched off,wherein an efficiency accounting is performed to determine an efficiency advantage of the alternating generator mode in comparison to the continuous generator mode, wherein the efficiency accounting takes into consideration a shift in a load level of the internal combustion engine, and further wherein the alternating generator mode of the electric machine is selected if the efficiency advantage of the alternating generator mode, determined by the efficiency accounting, reaches or exceeds a predetermined threshold value.
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Accused Products
Abstract
A method controls an operation of a motor vehicle equipped with a hybrid drive unit having a combustion engine and at least one electric machine that can be selectively operated as a motor or as a generator. The electric machine, when in generator mode, charges an energy store and/or supplies power to a vehicle electrical system of the motor vehicle. In generator mode, the electric machine is operated in alternating intervals, while maintaining predefined boundary conditions. In a first interval, the electric machine is operated with a first high electrical power output that is higher than an actual power consumption of the vehicle electrical system of the motor vehicle. The electric machine is switched off in a second interval. This largely prevents the electric machine from approaching operating points under light load which have a low efficiency and achieves a fuel advantage in comparison to a continuous operating mode.
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Citations
20 Claims
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1. A method for controlling an operation of a motor vehicle with a hybrid drive unit, which comprises an internal combustion engine and at least one electric machine coupled to a drive train of the motor vehicle, wherein the at least one electric machine is selectively operated in a motor operation mode and a generator operation mode, wherein, when the electric machine is operated in the motor operation mode, the electric machine powers the motor vehicle either alone or in addition to the internal combustion engine, and, when the electric machine is operated in the generator operation mode, the electric machine charges an energy store and/or powers a vehicle electrical system of the motor vehicle, wherein, when the electric machine is operated in the generator operation mode, depending on maintaining predetermined boundary conditions, the electric machine operates in an alternating generator mode and a continuous generator mode, wherein, when the electric machine is operated in the alternating generator mode, the electric machine is operated in a manner in which first and second intervals are alternated, wherein
(a) in a first interval, the electric machine is operated with a first, high electric power output which is greater than an actual power consumption of the vehicle electrical system, and (b) in the second interval, the electric machine is switched off, wherein an efficiency accounting is performed to determine an efficiency advantage of the alternating generator mode in comparison to the continuous generator mode, wherein the efficiency accounting takes into consideration a shift in a load level of the internal combustion engine, and further wherein the alternating generator mode of the electric machine is selected if the efficiency advantage of the alternating generator mode, determined by the efficiency accounting, reaches or exceeds a predetermined threshold value.
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20. A motor vehicle with a hybrid drive unit, which comprises an internal combustion engine and at least one electric machine coupled to a drive train of the motor vehicle, wherein the at least one electric machine is adapted to be selectively operated in a motor operation mode and a generator operation mode, wherein, when the electric machine is operated in the motor operation mode, the electric machine is adapted to power the motor vehicle either alone or in addition to the internal combustion engine, and, when the electric machine is operated in the generator operation mode, the electric machine is adapted to charge an energy store and/or to power a vehicle electrical system of the motor vehicle,
wherein the motor vehicle comprises control means configured to operate the electric machine, wherein, when the electric machine is operated in the generator operation mode, depending on maintaining predetermined boundary conditions, the electric machine operates in an alternating generator mode and a continuous generator mode, wherein, when the electric machine is operated in the alternating generator mode, the electric machine is adapted to operate in a manner in which first and second intervals are alternated, wherein (a) in a first interval, the electric machine is adapted to operate with a first, high electric power output which is greater than an actual power consumption of the vehicle electrical system, and (b) in a second interval, the electric machine is adapted to be switched off, wherein the control means is configured to perform an efficiency accounting to determine an efficiency advantage of the alternating generator mode in comparison to the continuous generator mode, wherein the efficiency accounting takes into consideration a shift in a load level of the internal combustion engine, and further wherein the alternating generator mode of the electric machine is selected if the efficiency advantage of the alternating generator mode, determined by the efficiency accounting, reaches or exceeds a predetermined threshold value.
Specification