Electronic control device having multiple system circuits
An electronic control device having multiple system circuits is such that power supply interrupting means is provided independently in all the system circuits, an abnormal system circuit is interrupted using the interrupting means in accordance with an abnormality being detected, and control is continued using a normal system circuit, whereby redundancy is improved. A multiple of system circuits formed of a drive unit system circuit and a controller system circuit are divided from a branch point of a power line, and furthermore, a relay function of being capable of controlling so as to interrupt a power supply to each system circuit is disposed in each system circuit, whereby each system circuit can independently be shut off or continue to be operated.
1. An electronic control device having multiple system circuits, being connected to a battery and divided from each other from a power line of the battery via a branch point, wherein
the multiple of system circuits are configured of a first drive unit system circuit, a second drive unit system circuit, a first controller system circuit, and a second controller system circuit,
each of the first and the second drive unit system circuits comprises a drive unit which supplies power from the power line to a load,
each of the first and the second controller system circuits comprises a central processing unit (CPU) which controls the corresponding drive unit, and
each of the first and the second drive units and the first and the second controller system circuits includes a relay that independently interrupts the power supply from the power line.
2. The electronic control device having multiple system circuits according to claim 1 , wherein the relay disposed in each of the first and the second drive unit system circuits and the first and the second controller system circuit independently have a control signal for turning the relay on and off, and an output source of the control signal differs in accordance with the system circuit.
3. The electronic control device having multiple system circuits according to claim 1 , wherein the control signal of the relay of the first drive unit is output via the CPU of the first controller system circuit, and the control signal of the second drive unit is output via the CPU of the second controller system circuit.
4. The electronic control device having multiple system circuits according to claim 1 , wherein the control signal of the relay of the first controller system circuit is output from a hardware component other than the CPU of the first controller system circuit, and the control signal of the relay of the second controller system circuit is output from another hardware component other than the CPU of the second controller system circuit.
5. The electronic control device having multiple system circuits according to claim 2 , wherein each of the first and the second controller system circuit includes a power supply circuit formed of a switching element inserted in series with the power line, and the switching element of the power supply circuit is used as the relay.
6. The electronic control device having multiple system circuits according to claim 3 , wherein each of the first and the second controller system circuits includes a power supply circuit formed of a switching element inserted in series with the power line, and the switching element of the power supply circuit is used as the relay.
7. The electronic control device having multiple system circuits according to claim 4 , wherein each of the first and the second controller system circuits includes a power supply circuit formed of a switching element inserted in series with the power line, and the switching element of the power supply circuit is used as the relay.
8. The electronic control device having multiple system circuits according to claim 1 , including at least two capacitors connected in series between the power line and a ground on an input side of the power supply circuit.
9. The electronic control device having multiple system circuits according to claim 1 , wherein the controller is formed of a multiple of power supply circuits connected to each other in series, and relay that interrupts the power supply from the power line is inserted in at least the power supply circuit nearest to a power supply of the multiple of power supply circuits.