Circuit arrangement for controlling e.g. piezo-actuator in motor vehicle, has control device including microprocessor to switch another control device to secure condition during malfunction of microprocessor of latter control device

摘要

The arrangement (1) has control devices (2, 3) for controlling respective actuators (A1, A2) and including respective microprocessors (20, 30). A bus (5) is connected to the devices. The microprocessor (30) periodically tests function of the microprocessor (20), and switches the device (2) to a secure condition during malfunction of the microprocessor (20). A line (32) transmits a signal from the device (3) to the device (2). The signal indicates whether the microprocessor (20) is functional. The actuator (A1) is a piezo-actuator, and the device (3) is a transmission control unit. An independent claim is also included for a method for testing a microprocessor of a control device.