To simplify the calculation of fuel injection control model based on the average model

a linear parameter varying (LPV) injection control state-space model was established based on the average model according to LPV state-space model principles. On this basis

the fuel injection pulse width control model under steady operating conditions and transient operating conditions was established

then simulated by Matlab/Simulink tool

and finally verified in an engine test bed. The simulation and test results show that:(1) the LPV state-space fuel injection control model meets the control requirements under steady and transient operating conditions. Although the accuracy of calculated fuel injection pulse width is slightly lower than that of the average model

the LPV state-space model calculation is simple

and can be directly used in the injection control algorithm design and easy to implement in engineering. (2) Compared with the interpolation algorithm

the control strategy based on the LPV state-space model leads to a lower engine power output

mainly owing to the simplified model that results in a reduced intake air flow rate.