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The paper employs the sensitivity analysis with respect to the parametric variations of the controlled plant in the low-cost controller designs for a vehicle power train systems with spark-ignition engine and continuously variable transmission. The three control solutions suggested in order to ensure the asymptotic speed tracking include a PI controller, a PID controller and a one-degree-of-freedom Takagi-Sugeno fuzzy controller. The digital simulation results prove that the low-cost control solutions ensure good control system performance with respect to the modifications of the reference input and to a category of parametric disturbances caused by the modifications of the vehicle's mass. A comparison between the control solutions is offered.