value applicable at engine acceleration and in asynchronism with the tdc signal this tia value is determined from a tia table 13 ktwt is defined as a fuel increasing coefficient applicable at and after tdc signal synchronous acceleration control as well as at tdc signal asynchronous acceleration control and is calculated from a value of the aforementioned water temperature dependent fuel increasing coefficient ktw obtained from the table 14 referring next to fig3 there is shown a flow chart of the aforementioned first program 1 for control of the valve opening period in synchronism with the tdc signal in the ecu 5 the whole program comprises an input signal processing block i a basic control block ii and a start control block iii first in the input signal processing block i when the ignition switch not shown of the engine is turned on cpu in the ecu 5 is initialized at the step 1 and the tdc signal is inputted to the ecu 5 as the engine starts at the step 2 then all basic analog values are inputted to the ecu 5 which include detected values of atmospheric pressure pa absolute pressure pb engine cooling water temperature tw intake air temperature ta throttle valve opening u03b8th battery voltage v output.