A noise tolerant time division multiplex system including a transmitter and receiver, each constructed as a monolithic integrated circuit and interconnected by a serial data wire. Data as well as power is supplied to the transmitter from a plurality of parallel connected input switches. The transmitter includes a parallel in/serial out shift register controlled by timing logic and further includes a tri-state driver for generating a three-level serial output signal indicative of the status of the input switches. The data is generated at a high rate to eliminate any deleterious effects of noise on the system. The receiver chip receives a regulated energizing potential from the transmitter chip over two additional wires, generates a timing signal from the three-level signal and loads the data in binary format into a serial in/parallel out shift register. When the data is properly positioned in the receiver register the data is transferred to latches which energize appropriate relays to control the direction of rotation of various motors controlling the seats, windows and door locks of an automobile.
An automotive vehicle having a control switch and at least two controlled elements includes a multiplex system having a central controller, at least one control bus coupled to the controller, and remote stations which apply a multiplexed data signal to the control bus indicative of the state of the switch and which demultiplex and store control signals from the controller for controlling activation of the first and second elements. The controller is programmed to set the control signals in accordance with the switch signal and in accordance with a status signal indicative of the state of the vehicle. The status signal can indicate whether any of the doors has been opened. By using a single control switch to perform multiple functions, depending upon the state of the vehicle, the total number of switches and therefore the cost of the system is reduced.
In a servomotor controller, when a comparing circuit (70) detects that a position of an object to be controlled has been achieved to a target position, an operation inhibiting signal generating section (71) supplies an operation inhibiting signal (71a) to an operation permitting/inhibiting signal-processing section (66), and obtains an operation stopped state of an H bridge-driving processing section (67) for controlling driving of a motor. A LIN communication processing section (61) receives information to a self address supplied from a superordiante device, and outputs a forced operation (recovery) request (61R) in the received information. The operation state of the H bridge-driving processing section (67) is obtained through an operation permitting trigger signal generating section (65) and the operation permitting/inhibiting signal-processing section (66) through the H bridge-driving processing section (67). The motor is accordingly driven, and the feedback control based on the difference between the target position and the present position is restarted.
An automobile servomotor controller includes a master control unit having a master control circuit for transmitting a designation signal and a slave unit having a motor and a control circuit which controls driving of a motor by outputting an operation signal to a driving device depending upon said designation signal. The slave unit is constructed by a same feedback control unit having a non-feedback control unit for inhibiting the operation of the motor until a target is changed by an input of a new designation signal with a target reached state and a feedback control unit for driving the motor to reach a target state by detecting a present position value with a position detecting device, and a control inhibiting signal for inhibiting the feedback control is individually provided to the designation signal transmitted from the master control circuit to the non-feedback control unit.
