A servo system for controlling the position Y(s) of an actuator to a position setpoint R(s) in a motor vehicle, the actuator having a predetermined transfer function G(s) associated with a pure delay e -ds , s being the Laplace variable, d representing the pure delay, this system being realized via - a position control U(s) at input of the transfer function G(s), the position Y(s) of the actuator corresponding to the response of the actuator to the position control U(s); - the position control U(s) being developed with the aid of a regulator of the Proportional Derivative type, formed of a proportional action loop and a derived action loop, realized respectively by a first and a second loop of retroaction between the position Y(s) and subtracting inputs of a first adder , the regulator realizing a third loop of retroaction between position Y(s) and a subtracting input of a second adder , the second adder having as summing input the position setpoint R(s); - the position setpoint R(s) being also used as input of an amplifying loop , the output of which is connected to a summing input of the first adder ; - the output of the second adder being used as an input of an integral action loop , the output of which is connected to a summing input of the first adder so that the first adder calculates at its output the position U(s) as a function of its summing and subtracting inputs; this system being characterized in that it includes a pure delay compensator in which - the position control U(s) is used as first summing input of a third adder and as input of a pure delay block of transfer function e -ds , the output of this pure delay block being used as subtracting input of the third adder , so that the third adder calculates its output from its summing input and its subtracting input: - the input of a high-pass filter is connected to the output of the third adder ; - the input of an amplifier is connected to the output of the high-pass filter ; - the output of the amplifier corresponds to a delay compensation term P(s), this output being used as subtracting input by the second adder . - a position control U(s) at input of the transfer function G(s), the position Y(s) of the actuator corresponding to the response of the actuator to the position control U(s); - the position control U(s) being developed with the aid of a regulator of the Proportional Derivative type, formed of a proportional action loop and a derived action loop, realized respectively by a first and a second loop of retroaction between the position Y(s) and subtracting inputs of a first adder , the regulator realizing a third loop of retroaction between position Y(s) and a subtracting input of a second adder , the second adder having as summing input the position setpoint R(s); - the position setpoint R(s) being also used as input of an amplifying loop , the output of which is connected to a summing input of the first adder ; - the output of the second adder being used as an input of an integral action loop , the output of which is connected to a summing input of the first adder so that the first adder calculates at its output the position U(s) as a function of its summing and subtracting inputs; - the position control U(s) is used as first summing input of a third adder and as input of a pure delay block of transfer function e -ds , the output of this pure delay block being used as subtracting input of the third adder , so that the third adder calculates its output from its summing input and its subtracting input: - the input of a high-pass filter is connected to the output of the third adder ; - the input of an amplifier is connected to the output of the high-pass filter ; - the output of the amplifier corresponds to a delay compensation term P(s), this output being used as subtracting input by the second adder . <EOS>