Abstract: A retarder brake automatic control system capable of causing a vehicle to run downhill at a speed set by a speed setter, in which a vehicle speed is automatically controlled by means of a microcomputer. The microcomputer includes a fault detector which detects abnormality in factors for safety running of the vehicle, and controls a retarder brake so as to cause the vehicle to run at an appropriate speed in accordance with the output of the fault detector.

Abstract: A press load meter according to the present invention employs strain gauges as stress detectors. Outputs of the stress detectors are analogously processed until they are amplified and the amplified signals are digitally processed in a multiplexed form with respect to each channel whereby measurement in many stress detectors can be accomplished substantially simultaneously.According to the invention, outputs of the respective stress detectors and a total sum thereof appearing before start of an operation cycle of the press are stored in a first memory as initial unbalance components with respect to each channel and a maximum load value during one operation cycle of the press is stored in a second memory with respect to each channel. Contents of the first memory are subtracted from contents of the second memory, the result of the subtraction being displayed with respect to each channel.