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A mechanism for regulating an engine by using an actuator that is controlled in bang-bang mode, in which non-linearities are introduced in the control strategy in order to avoid putting excessive demand on an electric motor. The actuator is controlled by power supply pulses, which is a specific type

A mechanism for regulating an engine by using an actuator that is controlled in bang-bang mode, in which non-linearities are introduced in the control strategy in order to avoid putting excessive demand on an electric motor. The actuator is controlled by power supply pulses, which is a specific type of bang-bang control and, therefore, the actuator can receive a certain number of discrete commands. In one example, the actuator can receive two types of commands, for rotating in one direction and for rotating in the other direction.

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1. An adjustment device for adjusting at least one operating variable of an engine as a function of a setpoint, the device comprising: means for calculating a difference between a measurement of said at least one operating variable and said setpoint and if the calculated difference lies within a pre

1. An adjustment device for adjusting at least one operating variable of an engine as a function of a setpoint, the device comprising: means for calculating a difference between a measurement of said at least one operating variable and said setpoint and if the calculated difference lies within a predetermined range then outputting an error value of zero otherwise outputting the error value equal to the calculated difference;a first quantizer configured to quantize an amplitude of said error value;means for determining a command duration as a function of a variation of said quantized error value amplitude;a second quantizer configured to quantize said determined command duration; anda sender unit configured to send a command of the bang-bang type in the form of a frame addressed to a port of an actuator configured to respond to a certain number of discrete commands, said command being a function of said quantized command duration and a sign of the variation of said quantized error value amplitude,wherein said frame has a predetermined duration, and is subdivided cyclically into a predetermined number of pairs of first and second fields,wherein each field is of a same field time duration,wherein the first field corresponds to a first operation of the actuator in a first rotation direction and the second field corresponds to a second operation of the actuator in a second rotation direction,wherein each field includes one of a first or second value for asserting or not asserting, respectively, said corresponding actuator operation for the corresponding field time duration, andwherein a number of fields including the first value in each frame is a function of the quantized command duration. 2. The adjustment device according to claim 1, further comprising means for defining said predetermined range. 3. An engine including: at least one actuator configured to respond to a certain number of discrete commands; andan adjustment device, coupled to the at least one actuator, configured to adjust at least one operating variable of an engine as a function of a setpoint, the adjustment device comprising: means for calculating a difference between a measurement of said at least one operating variable and said setpoint and if the calculated difference lies within a predetermined range then outputting an error value set to zero otherwise outputting an error value equal to the calculated difference;a first quantizer configured to quantize an amplitude of said error value;means for determining a command duration as a function of a variation of said quantized error value amplitude;a second quantizer configured to quantize said determined command duration; anda sender unit configured to send a command of the bang-bang type in the form of a frame addressed to a port of said at least one actuator, said command being a function of said quantized command duration and a sign of the variation of said quantized error value amplitude,wherein said frame has a predetermined duration, and is subdivided cyclically into a predetermined number of pairs of first and second fields,wherein each field is of a same field time duration,wherein the first field corresponds to a first operation of the at least one actuator in a first rotation direction and the second field corresponds to a second operation of the at least one actuator in a second rotation direction,wherein each field includes one of a first or second value for asserting or not asserting, respectively, said corresponding actuator operation for the corresponding field time duration, andwherein a number of fields including the first value in each frame is a function of the quantized command duration. 4. The engine according to claim 3, wherein: said at least one actuator is connected to said adjustment device by a bus via an interface, said interface comprising: a port addressable by said adjustment device;means for receiving, via said port, said frame; andmeans for processing each of said fields independently and for sending or not sending a control signal to said at least one actuator as a function of the value contained in the field. 5. In a device for adjusting at least one operating variable of an engine as a function of a setpoint, a method of adjusting said at least one variable comprising: receiving a measurement of said at least one engine variable at said device;calculating a difference between said at least one operating variable measurement and said setpoint and if the calculated difference lies within a predetermined range then setting an error value to zero otherwise setting the error value equal to the calculated difference;quantizing an amplitude of said error value;determining a command duration as a function of a variation of said quantized error value amplitude;quantizing said determined command duration; andsending a command of the bang-bang type in the form of a frame addressed to a port of an actuator configured to respond to a certain number of discrete commands, said command being a function of said quantized command duration and a sign of the variation of said quantized error value amplitude,wherein said frame has a predetermined duration, and is subdivided cyclically into a predetermined number of pairs of first and second fields,wherein each field is of a same field time duration,wherein the first field corresponds to a first operation of the actuator in a first rotation direction and the second field corresponds to a second operation of the actuator in a second rotation direction,wherein each field includes one of a first or second value for asserting or not asserting, respectively, said corresponding actuator operation for the corresponding field time duration, andwherein a number of fields including the first value in each frame is a function of the quantized command duration. 6. A non-transitory computer-readable medium on which there is recorded a computer program including instructions for implementing, on a computer, a method of adjusting at least one operating variable of an engine as a function of a setpoint, the method comprising: receiving a measurement of said at least one operating variable;calculating a difference between said received measurement and said setpoint and if the calculated difference lies within a predetermined range then setting an error value to zero otherwise setting the error value equal to the calculated difference;quantizing an amplitude of said error value;determining a command duration as a function of a variation of said quantized error value amplitude;quantizing said determined command duration; andsending a command of the bang-bang type in the form of a frame addressed to a port of an actuator configured to respond to a certain number of discrete commands, said command being a function of said quantized command duration and a sign of the variation of said quantized error value amplitude,wherein said frame has a predetermined duration, and is subdivided cyclically into a predetermined number of pairs of first and second fields,wherein each field is of a same field time duration,wherein the first field corresponds to a first operation of the actuator in a first rotation direction and the second field corresponds to a second operation of the actuator in a second rotation direction,wherein each field includes one of a first or second value for asserting or not asserting, respectively, said corresponding actuator operation for the corresponding field time duration, andwherein a number of fields including the first value in each frame is a function of the quantized command duration.