An automatic control system for regulating the temperature of blower air discharged over a heater core to a vehicle passenger compartment A thermistor is disposed to sense discharge air adjacent the heater core and provide a temperature signal An electrical indication is provided of the condition of a servomotor driven valve controlling water flow to the heater core An electrical reference signal is provided indicative of a user selected relative change of flow discharge air temperature A signal is provided indicating the speed of the water pump circulating liquid to the heater core The signals are summed and the valve sums driven until the sum is zero and the valve modulated to maintain the sum at zero for regulating blower air discharge temperature constant

Compensating for water pump speed variations in a tempered air system for vehicle passenger compartments

An automatic control system for regulating the temperature of blower air discharged over a heater core to a vehicle passenger compartment. A thermistor is disposed to sense discharge air adjacent the heater core and provide a temperature signal. An electrical indication is provided of the condition of a servomotor driven valve controlling water flow to the heater core. An electrical reference signal is provided indicative of a user selected relative change of flow discharge air temperature. A signal is provided indicating inlet pressure to the valve controlling flow of liquid to the heater core. The signals are summed; and, the valve servo driven until the sum is zero modulating the valve to maintain the sum at zero for regulating blower air discharge temperature at a constant level.

Compensating for water pressure variations in a tempered air system for vehicle passenger compartments

PURPOSE:To enlarge a scope which can hear without losing a stereo feeling by inclining plural speakers receiving two overlapped frequencies to the inside, arranging horizontally, attenuating a lead sound for a delay sound and deleting a harsh effect. CONSTITUTION:Speaker units M1 and M2 are the same impedance, the same shape, the same dimensions, and the cabinet 10 is inclined by respective theta angles for the front and fitted diagonally for the cabinet 10, and the speaker units M1 and M2 are in charge of the same band as the same frequency band, and theta is actually set to 30-45 deg.. When the sound pressure is equal by two hearing points 0 and 0', the units are the same as the above-mentioned conventional example, and since two speaker units M1 and M2 are arranged in the horizontal direction, a harsh effect is deleted by the composite directional characteristic.

Speaker system for stereo

Disclosed is an optimized water pump energy conservation control method. The optimized water pump energy conservation control method comprises the following steps of 1) deriving a total input power calculation formula of a water pump, performing calculation according to the total input power calculation formula of the water pump to find out the optimal working point on a water pump operating characteristic curve, wherein the optimal working point indicates the lowest total input power, namely, the lowest water pump energy consumption, when a required flow rate is reached; 2) through cooperation of adjustment of valves and a frequency converter, adjusting the working point of the water pump to the optimal working point determined in the step 1). By means of the dual-adjustment of the frequency converter and the adjusting valves, the optimized water pump energy conservation control method enables the water pump to reach a minimum total energy consumption under the premise of meeting the requirements of users on the flow rate.

Optimized water pump energy conservation control method

Controller for water level of deaerator

PURPOSE:To prevent the repeated open/close operation of a clock valve and smoothly control the quantity of feed water, by providing a trigger circuit having a hysteresis as a device for applying a block valve open/close signal. CONSTITUTION:When a rotational frequency N5 corresponding to a predetermined quantity Q1 of feed water is reached, the trigger circuit 20 generates the block valve open/close signal to entirely close the block valve 5. Therefore, a feed water pump is controlled by a feed water controller 10 to a rotational frequency N3 for the same flow rate Q1 as before the block valve 5 is closed. As for the increase in the quantity of feed water, the block valve 5 is fully opened by the signal generated by the trigger circuit 20 when a rotational frequency N2 for a predetermined flow rate Q2 higher than the flow rate Q1 corresponding to the entire closing of the block valve 5 is reached. Then, the rotational frequency of the pump is reduced from N2 to N1 by the action of the feed water controller 10 and the pump is controlled to the same flow rate Q2 as before the block valve 5 is closed.

Feed water controller

PURPOSE:To provide a flow rate control system, which permits satisfactory water supply control with sudden charges of the water supply rate with the operation of a re-circulation valve suppressed by quickly detecting the rate of re-circulation through the re-circulation valve permitting part of the flow from a water supply pump back to a degasifier suppressed by quickly detecting the rate of re-circulation. CONSTITUTION:In a flow control system, in which flow from a water supply pump 4 driven by a steam turbine 3 is supplied through a check valve 5 to a water supply heater 6 and is also partly re-circulated through a re-circulating path 30 having a re-circulating valve 7, an aperture detector 22 for detecting the aperture of the re-circulating valve 7 is provided and its output is coupled through a first function unit 23 to a multiplier 28. To this multiplier 28, a signal repesenting the pressure difference between the upstream and downstream sides of a re-circulating valve 7 is coupled through a differential operational unit 26 and a second function unit 27, and from this difference signal and the afore-mentioned aperture signal a signal representing the rate of flow through the re-circulating valve 7 is obtained and coupled to an adder 14, to which a water supply control unit 14 is connected.

Flow rate control system for turbine driven supply pump

Apparatus for controlling recirculating amount of feed water pump

PURPOSE:In the steam turbine control apparatus which adopted the electrically operated oil hydraulic control device having the stage difference pressure feed back within, a stable circuit is inserted onto the feedback part for the stage difference pressure signal, and the reliability of the main control circuit is improved.

Seam turbine control apparatus

PURPOSE:A control system for the steam turbine used to drive a feed water pump provided with a recirculation valve, of which the controlling efficiency is improved and the instability accompanying the recirculation valve action is eliminated.

Akashi Teiichirou

Papers

Feed water controller

Flow rate control system for turbine driven supply pump

Apparatus for controlling recirculating amount of feed water pump

Seam turbine control apparatus

Control system for feed water pump driving turbine