Abstract: An image forming apparatus includes: a fixing roller that fixes an unfixed image to a medium; a drive motor of the fixing roller, and a hardware processor that acquires information regarding a state of the image forming apparatus or information regarding a state of the medium, and controls a number of rotations of the drive motor between a preset upper limit value and a preset lower limit value, wherein the hardware processor changes the upper limit value and the lower limit value while maintaining a difference between the upper limit value and the lower limit value on a basis of the acquired information.

Abstract: A first ventilation apparatus of ventilation apparatuses which form a ventilation system includes: a first information transmission part (18a); a first information reception part (19a); and a first control part (17a). The first control part (17a) includes: a first total ventilation air volume determination part (20a); a first-ventilation-apparatus first air volume decision part (21a); and a first air volume detection part (22a).

Abstract: A first ventilation apparatus of ventilation apparatuses which form a ventilation system includes: a first information transmission part (18a); a first information reception part (19a); and a first control part (17a). The first control part (17a) includes: a first total ventilation air volume determination part (20a); a first-ventilation-apparatus first air volume decision part (21a); and a first air volume detection part (22a).

Abstract: A four-wheel steering apparatus comprises a front wheel steering angle sensor for detecting the steering angles given to the front wheels, a vehicle speed sensor for detecting vehicle speeds, a rear wheel output shaft for giving steering angles to the rear wheels by being displaced it in the axial direction, a centering spring having the resiliency enabling the rear wheel output shaft to be returned to the neutral position, an electric motor for causing the rear wheel output shaft to be displaced in the axial direction against the resiliency of the centering spring, and a controller for controlling the energizing of the electric motor on the basis of the signals from the front wheel steering sensor and vehicle speed sensor, the controller adjusting the output torque of the electric motor on the basis of the signals from the front wheel steering sensor and vehicle speed sensor to control the rear wheel output shaft to be displaced for a desired amount by open loop control.

Abstract: A fuel injection device is disclosed, which includes a body having first and second bores coupled to each other in series. A delivering plunger is fitted in the first bore, so that it can slide, to define a delivering pump chamber therein. Fuel under a constant pressure is supplied to the delivering pump chamber through a control passage, on which an electromagnetic valve is provided for opening and closing it. An injection plunger is fitted in the second bore, so that it can slide, to define in the second bore a chamber linking the delivering pump chamber and an injection pump chamber. Fuel under a pressure lower than the pressure of fuel in the delivering pump chamber is supplied to the injection pump chamber, which is hydraulically coupled to an injection nozzle.