To achieve as usual fail safe processing as possible for vehicle control even when a trouble is detected in programs.
Two programs having the same operation items are provided for computing an acceleration opening. When the computation of the acceleration opening is executed, these two programs are individually executed (S120, S130) and whether operation results ACCP1, ACCP2 of the programs correspond to each other is determined (S140). When they correspond to each other, both programs are normal to make the ACCP1 effective as an actual acceleration opening ACCP0 (S150). When they do not correspond (S140:NO), checksum-system check is carried out for the processing-1 program (S160, S170). As a result, if it is normal, the operation result ACCP1 of the processing-1 program is made effective (S190), and if it is abnormal, the operation result ACCP2 of the processing-2 program is made effective (S210).
TAKASHIMA TSUNETOSHI
WATANABE HIROSHI
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