摘要:
A cooling apparatus for an internal combustion engine includes a fan that cools a coolant by operating at least at a first drive voltage and a second drive voltage higher than the first drive voltage; and a control unit that drives the fan at the first drive voltage when a vehicle is driven at a low vehicle speed that is a vehicle speed lower than a vehicle speed threshold and a coolant temperature is higher than a fan low-voltage activation threshold.
摘要:
A sequence controller, employing digital techniques, employs clock pulses to energize and deenergize incremental loads sequentially at spaced intervals to correct the deviation of a sensed condition from a setpoint. The clock is inhibited from producing pulses when no deviation requiring correction exists. A feedback provides anticipation for the effect of the energization and deenergization of condition changing loads. Hunting is substantially eliminated.
摘要:
Temperature and/or humidity electrical/electronic controls to maintain a room at a constant temperature and humidity. The controls provide an on-off function for a conditioner or a step function to actuate one or more temperature and/or humidity conditioners in response to a percentage of change. A bridge control circuit operable to activate either of a pair of triac switching circuits includes a unique arrangement of sensitivity and hysteresis components.
摘要:
A multistage control method of a flow rate control valve which is opened or closed when a DC motor rotates. The method includes dividing angular speed limit areas of the DC motor depending on stages based on limit values so that angular speed values of the DC motor are to be scheduled depending on the stages and controlling the DC motor to rotate at a determined angular speed value depending on a corresponding angular speed instruction to the DC motor within one angular speed limit area. When the angular speed value of the DC motor is outside a limit value of the corresponding angular speed limit area, the DC motor rotates at a determined angular speed value until reaching outside a limit value of the corresponding limit area depending on a corresponding angular speed instruction to the DC motor within an angular speed limit area of the next stage.
摘要:
An electric motor system includes a brushless direct-current motor, a driver circuit, a position sensor, and a control circuit. The motor has an output shaft for transmitting torque. The driver circuit supplies power to the motor according to a control signal input thereto. The position sensor measures an angular, rotational position of the motor shaft. The control circuit controls operation of the motor. The control circuit includes a position sensor terminal, a reference terminal, a differential calculator, a controller, and a gain adjuster. The position sensor terminal receives a feedback signal. The reference terminal receives a reference signal. The differential calculator generates an error signal representing a difference between the measured and targeted rotational positions. The controller generates the control signal based on the error signal through a combination of control actions. The gain adjuster is connected to the controller to adjust a gain of each control action.
摘要:
A method and system for providing dosing of fluid is described. The method and system is directed to the control of a plurality of parallel on/off valves which regulate the flow of the fluid. The system includes a plurality of base control valves for delivering a base flow amount. The base control valves are preferably arranged to have binary graduation of their respective flow rates. These base control valves are optionally discontinuously switched on and/or off for delivering the base flow amount. A "timed" valve is varied according to pulse-width modulation techniques to deliver a continuously variable partial flow. The control of the timed valve is effected by electrical circuitry which generates a feedback error signal related to the flow quantity.
摘要:
A process control system providing a particular control effort function is divided into a primary control effort portion having a primary controller, and a feed back from the controlled process to the primary controller, and a secondary control effort portion having a secondary controller in controlling relation therewith, and receiving its control input from the primary controller. The secondary controller is provided with limits such that it becomes saturated in operation, thereby permitting selective overriding by the primary controller, while utilizing the secondary controller and actuators the maximum practical amount. The arrangement is suitable for use with continuously variable devices or for use with on-off (bang-bang) devices. The particular embodiments illustrated are (1) a bang-bang heater system, and (2) a continuously variable fluid flow control system.
摘要:
An electrical circuit for a heating system has a plurality of electrical resistance heating elements and a blower all controlled by a plurality of electro-thermally actuated relays. The circuit is arranged so that the heating elements are sequentially energized and de-energized and so that the blower is maintained in operation at all times that any one of the heating elements is energized. A thermostat controls the operation of the relays, the second and the last of which each having switches connected in series circuits with the actuator of the first relay and in parallel with the thermostat so as to maintain blower operation, which is controlled by the first relay, when the thermostat opens.
摘要:
A contact-and-separation system includes a first roller, a second roller, and a contact-and-separation device. The first roller contacts a belt. The second roller is opposed to the first roller. The contact-and-separation device contacts or separates the belt to or from the second roller via a sheet conveyed. The contact-and-separation device includes an eccentric cam, a motor, and a circuitry. The eccentric cam is mounted on an end of a rotation shaft of the first roller. The motor rotates the eccentric cam. The circuitry controls the motor to rotate the eccentric cam to contact or separate the belt to or from the second roller via the sheet conveyed. The circuitry controls the motor to decelerate a rotation speed of the motor on contact or separation of the belt to or from the second roller between the first roller and the second roller.