METHOD AND APPARATUS FOR PRODUCING CURRENT VALUES DEPENDENT ON THE POSITION OF THE ACCELERATOR PEDAL FOR THE PURPOSE OF CONTROLLING THE POWER OF ONE OR MORE DRIVES IN A MOBILE DEVICE WITH A FUEL CELL FOR SUPPLYING ENERGY
First Claim
1. A method for producing a current value as a function of position of an accelerator pedal for adjusting power of at least one drive of a mobile device having a fuel cell for supplying energy to the at least one drive and electrical loads, the method comprising:
- measuring an output voltage of the fuel cell during a change in a desired current value as a function of the position of the accelerator pedal;
comparing the output voltage of the fuel cell to a lower limiting voltage value;
reducing the desired current value by an amount equalling the sum of a current drawn from the fuel cell by the electrical loads and a current required to adjust the power of the fuel cell to a driving power corresponding to the desired current value; and
adjusting the reduced desired current value so as not to impair the operation of the at least one drive and the electrical loads while the at least one drive is emitting power in accordance with a desired torque value.
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Accused Products
Abstract
A method and an apparatus produce current values dependent on the position of the accelerator pedal controlling the power of one or more electric drives for moving a mobile device that is energised by a fuel cell. The time required by the drive or drives to respond to a change in the desired current value produced as a function of the position of the accelerator pedal is kept as small as possible by producing a current value—convertible into a desired torque value—which is held continuously at a value sufficient to ensure that the output voltage of the fuel cell just avoids undershooting a critical limit.
11 Citations
10 Claims
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1. A method for producing a current value as a function of position of an accelerator pedal for adjusting power of at least one drive of a mobile device having a fuel cell for supplying energy to the at least one drive and electrical loads, the method comprising:
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measuring an output voltage of the fuel cell during a change in a desired current value as a function of the position of the accelerator pedal;
comparing the output voltage of the fuel cell to a lower limiting voltage value;
reducing the desired current value by an amount equalling the sum of a current drawn from the fuel cell by the electrical loads and a current required to adjust the power of the fuel cell to a driving power corresponding to the desired current value; and
adjusting the reduced desired current value so as not to impair the operation of the at least one drive and the electrical loads while the at least one drive is emitting power in accordance with a desired torque value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for producing a current value as a function of position of an accelerator pedal for adjusting the power of at least one drive for moving a mobile device having a fuel cell for supplying energy to the at least one drive and electrical loads, the apparatus comprising:
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a controller having an input and an output, the input including the difference between a lower limiting voltage value and a measured output voltage of the fuel cell;
whereinthe controller superimposes a current, which is proportional to the difference and has a current-limiting characteristic, on an available current to produce a corrected current value that is used to determine a desired torque value; and
the available current is a difference between a desired current, which is associated with a predetermined power or speed of the at least one drive, and the sum of currents required for this power by auxiliary units of the fuel cell and currents drawn by the loads. - View Dependent Claims (9)
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10. An apparatus for producing a current value as a function of position of an accelerator pedal for adjusting the power of at least one drive for moving a mobile device having a fuel cell for supplying energy to the at least one drive and electrical loads, the apparatus comprising:
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means for measuring an output voltage of the fuel cell during a change in a desired current value as a function of the position of the accelerator pedal;
a unit for comparing the output voltage of the fuel cell with a lower limiting voltage value; and
a controller programmed to reduce the desired current value by an amount equalling the sum of a current drawn from the fuel cell by the electrical loads and a current required to adjust the power of the fuel cell to a driving power corresponding to the desired current value, and to adjust the reduced desired current value so as not to impair the operation of the at least one drive and the electrical loads while the at least one drive is emitting power in accordance with a desired torque value.
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Specification