| 摘要 |
PROBLEM TO BE SOLVED: To suppress degradation of engine operation performance in failure of any of A/D converters while making the number of A/D converters same as the number of groups of injectors.SOLUTION: Each group of injectors IJ1-IJ4 is provided with current detection circuits 53, 54 and ADCs (A/D converters) 61, 62, and an ADC control portion 81 switches MUXs (multiplexers) 63, 64 between a first state for inputting signals So1, So2 from the current detection circuits 53, 54 respectively to each of ADCs 61, 62, and a second state for inputting voltage Vcm representing voltage Vc of a capacitor C0 to each of ADCs 61, 62. A drive control portion 82 controls discharge current from the capacitor C0 and controls constant current by using A/D conversion results AD1, AD2 in a case when the MUXs 63, 64 are in the first state, and a voltage control portion 83 controls a booster circuit 55 by using one of the A/D conversion results AD1, AD2 when the MUXs 63, 64 are in the second state, in driving the injectors.SELECTED DRAWING: Figure 1 |
