Patent ID: 8577588

Claim:
A vehicle comprising; a frame; an engine supported by the frame, the engine generating a torque to produce power and propel the vehicle; an electronic control unit electrically connected to the engine to control the output of the engine; three wheels connected to the frame, at least one of the three wheels being operatively connected to the engine; a brake system adapted to generate a brake pressure, the brake system being in operative association with at least one of the three wheels for braking the vehicle; a straddle-type seat supported by the frame, the seat having a driver seat portion and a passenger seat portion; an electronic stability system disposed onboard the vehicle; and at least one of a wheel rotation sensor operatively connected to the electronic stability system and a lateral acceleration sensor electrically connected to the electronic stability system; the electronic stability sensor receiving inputs from a load sensor and the at least one of the wheel rotation sensor and the lateral acceleration sensor; the electronic stability system providing outputs to at least one of the brake system for braking the vehicle and the engine control unit to change the power output transmitted to the wheels by the engine; the electronic stability system using a first calibration to determine the outputs when the load sensor is in a non-loaded state and a second calibration to determine the outputs when the load sensor is in a loaded state; the load sensor being a passenger presence sensor, the passenger presence sensor being associated with the passenger seat portion for sensing the absence or the presence of a passenger sitting on the passenger seat portion, the passenger presence sensor associated with the passenger seat portion being located in the passenger seat portion below a position corresponding to a position of a sitting bone of a passenger sitting on the passenger seat portion in a normal sitting position, facing forward with legs on each side of the seat.