Abstract: A process and a device for shutting off of a motor vehicle heating device in which a liquid heat exchange medium is heated by a heating device and is delivered to a heat exchanger of the heating device by means of a circulating pump driven by an electric motor. To prevent damage to the heating device or the circulating pump when the heat exchange medium circuit is not adequately filled with liquid heat exchange medium or in the case of poor venting, a value which at least indirectly indicates the power consumption of the electric motor is sent to a control device as a signal indicative of the existence of a delivery fault associated with the circulating pump.

Abstract: A method and firmware motor control and fault operation system for positioning motors of a Heater-Ventilation-Air Conditioner Unit in response to request of chosen comfort levels in the interior of a motor vehicle. The positioning being accomplished by moving the shafts of the motors in a direction and for a period of time determined from mathematical computations. The system controls motor shaft movement of motors arranged to operate as hybrid closed and open loop motor control systems and all motor shaft movement performed with respect to purely time period measurements.

Abstract: Coolant circuit of an internal combustion engine for a motor vehicle, which connects the internal combustion engine, a coolant/air heat exchanger for an interior space of the vehicle, and a combustion gas/coolant heat exchanger of a heater generating heat by combustion. The coolant circuit has a bypass line bypassing the internal combustion engine and a thermostat valve which regulates the return temperature in a predetermined range of adjustment by controlling coolant flow through the bypass line and/or the internal combustion engine. The thermostat valve is provided with at least two valves formed by valve seats and valve sealing elements, especially valve disks, wherein the range of adjustment of the thermostat valve (12) can be modified from the outside.

Abstract: A thermal actuated switchable heat pipe 10 for use in a passenger compartment heating system of an automotive vehicle. The invention 10 includes a condenser 12, an evaporator, 14 vapor and fluid flow paths 16 and 18 therebetween and a working fluid 20 disposed therein. A thermostat 46 is mounted between the condenser 12 and the evaporator 14 for controlling the flow of fluid 20 therebetween. In a specific embodiment, the condenser 12 is in thermal contact with the engine coolant of the vehicle and the evaporator 14 is in thermal contact with the exhaust of the vehicle. The thermostat 46 is in thermal contact with the engine cooling system and is adapted to block the flow of fluid 20 in the fluid flow path 18 in response to the temperature thereof.

Abstract: A system for controlling temperature of air to be discharged into a cabin of a vehicle in an automatically controlled air conditioner system of an automotive vehicle. The air conditioner system is provided with a cooling unit and a heating unit for cooling and heating conditioning air in the air conditioner system for delivery to the cabin of the vehicle. The air conditioner system includes a mechanism for mixing the cooling air and the heating air in a stepwise manner so as to generate a controlled temperature of conditioning air to be discharged into the vehicle cabin with a moderate adjustment in transition so as to maintain a desired vehicle cabin temperature.

Abstract: An automatic HVAC control system having a scheduled control in which the HVAC control variables are regulated in accordance with an empirically determined schedule to provide a desired comfort level in the vehicle, and an adaptive control which modifies the scheduled control when stall or overshoot conditions occur so that the design performance level of the system is achieved under all conditions.

Abstract: A heat generator suitable for heating the cab or passenger compartment of a motorized automobile vehicle comprises an enclosure inside which are mechanical friction means adapted to be driven by the motor of the vehicle. These friction means are operable with a variable clamping force. A heat transfer liquid is circulated through this enclosure. The clamping force of the friction means is varied in inverse proportion to the speed at which friction means are driven by the motor. Thus the clamping force on the friction means is reduced as the motor speed increases, so that the quantity of heat produced is largely independent of the rotation speed of the motor.

Abstract: Steam heating apparatus for heating air introduced into a building in which the heat of condensate under pressure which otherwise would be wasted is converted into flash steam and is used in auxiliary heating means to supplement the heat of the primary heating system. The heating system operates at a predetermined steam pressure unless the incoming air temperature falls below some predetermined minimum at which additional steam temperature is required. In that case, automatic temperature responsive controls increase the steam pressure to increase the steam temperature.

Abstract: In an apparatus for controlling an air conditioner through a computer, various controls are automatically effected by voice command as well as by manual operation. Specific voice commands are predetermined in accordance with the control objectives. The voice commands are read by a voice recognizing equipment, whereby recirculated air-fresh air switching and air outlet switching are effected by a microprocessor in accordance with the commands, thereby eliminating necessity for manual operation.

Abstract: A control apparatus has input devices, actuators and a single chip microcomputer and is applied to control air conditioning units carried in a cab-over wagon or a one-box car. The thermal loads of the compartment sections to be air conditioned are determined by the microcomputer on the basis of informations from the input devices and calculations in accordance with the control programs written in the microcomputer. The thermal loads of the compartment sections and the desired temperatures thereof are considered in the microcomputer, which outputs various command signals into the actuators so as to actuate front and rear air conditioning units to maintain the compartment sections to be air conditioned at the desired temperatures.

Abstract: A vehicle air conditioner control apparatus for supplying into the passenger compartment of a vehicle a flow of air which is temperature controlled in accordance with air conditioner control conditions, automatically controls an air change-over damper in response to a manual setting device for selectively commanding the induction of outside air, the induction of inside air and the induction of outside and inside air into an air duct and in response to a signal indicative of an absolute temperature of air inducted into the air duct, which is computed and generated in accordance with the outputs of a plurality of sensors.

Abstract: An electronic circuit for controlling the heating or air conditioning apparatus in an automobile permits the capability of heating the vehicle without the heat surges which can occur after short periods of ignition turn off and permitting manual on-off control of the heating system even if the thermostat fails. A second circuit for controlling the device activating the valve controls the flow of heating or cooling medium independently of the ignition switch and contains a timer to keep the valve closed for a predetermined time after ignition switch-off. Two limit switches are also present for permitting the valve to be set at an open or closed position independently of both the ignition switch and the timer.

Abstract: An air-conditioner control system for vehicles which is responsive to a condition in the compartment of a vehicle to move an air-flow controlling damper in an air duct. When the supply mode of conditioned air is a heater supply mode and when it is detected that the level of insolation in the vehicle compartment is higher than a predetermined level, the control system alters the supply mode of conditioned air to a bi-level supply mode.

Abstract: In an electric control method for an automobile air conditioner, a digital computer is utilized to calculate a function required to direct the actual in-car temperature toward a desired value in consideration with various changes of ambient temperature and the calculation is compensated to effectively reduce a difference between the actual in-car temperature and the desired value when the rate of change of the actual in-car temperature becomes below a predetermined value.

Abstract: In an apparatus for controlling the speed of the blower motor in response to the difference between the temperature setting and the temperature inside the vehicle, the maximum speed of the blower motor is limited in accordance with the temperature of engine coolant. Consequently, the quantity of air issuing from the blower is always such that it does not make the passengers feel uncomfortable.

Abstract: In an electric control method for an automobile air conditioner, a digital computer is utilized to calculate a function required to direct the actual in-car temperature toward a desired value in consideration with various changes of ambient temperature and the calculation is compensated to effectively reduce a difference between the actual in-car temperature and the desired value when the rate of change of the actual in-car temperature becomes below a predetermined value.

Abstract: A water cooling loop is connected to cool an engine of a railway car or the like and includes a heat exchanger. A system for heating a compartment includes a pump for pumping water to heating elements. The water from the pump is selectively pumped through a first path which includes the heat exchanger or through a second path which by-passes the heat exchanger dependent upon the temperature condition inside the car.

Abstract: An electric control method and apparatus for an automobile air conditioner which is capable of conducting recirculation of inside air from a passenger compartment into an air duct under undesired outside air conditions caused by noxious gases, dust and the like and is also capable of conducting induction of outside air into the compartment through the air duct when the undesired outside air conditions are extinguished.