Abstract: A vehicle air conditioning system is configured to cool a passenger compartment having a first zone and a second zone. An air handler has a recirculation door movable from a first position in which only fresh air from outside the vehicle enters the air handler and a second position in which only recirculation air from the first zone enters the air handler. A controller is connected to the first sensor, the recirculation door and a control panel. The controller is configured such that in response to the control panel being set to: provide cooling only to the second zone; the recirculation door being set to provide fresh air; and a first sensor's conditions being meet, the controller changes the setting of the recirculation door from fresh air to recirculated air to the air handler over-riding a manual setting of the position of the recirculation door.

Abstract: A first sensor measures temperature at a first evaporator that cools a first zone. A second sensor measures temperature at a second evaporator that cools a second zone. A controller operates a compressor in a normal cooling mode or a single zone cooling mode. In the normal cooling mode, both the first zone and the second zone are cooled with the compressor operated by the controller in response to temperature measurements from one or both of the first sensor and the second sensor. In the single zone cooling mode, only the second zone is cooled with the compressor controlled by the controller in response to temperature measurements from the second sensor and the controller determining that the first evaporator has a low probability of accumulating frozen moisture on surfaces thereof, and in response to determining a high probability of accumulating frozen moisture on surfaces thereof the compressor is not operated.

Abstract: A first sensor measures temperature at a first evaporator that cools a first zone. A second sensor measures temperature at a second evaporator that cools a second zone. A controller operates a compressor in a normal cooling mode or a single zone cooling mode. In the normal cooling mode, both the first zone and the second zone are cooled with the compressor operated by the controller in response to temperature measurements from one or both of the first sensor and the second sensor. In the single zone cooling mode, only the second zone is cooled with the compressor controlled by the controller in response to temperature measurements from the second sensor and the controller determining that the first evaporator has a low probability of accumulating frozen moisture on surfaces thereof, and in response to determining a high probability of accumulating frozen moisture on surfaces thereof the compressor is not operated.

Abstract: A vehicle air-conditioning system has an intake door that switches between an inside air recirculation mode to take in air from an inside air introduction port and an outside air introduction mode to take in air from an outside air introduction port, a blower that blows the air introduced through any of the inside air introduction port and the outside air introduction port toward inside of a vehicle cabin, a heater that heats the air blown by the blower, and a controller that activates the heater when there is a request for heating the inside of the vehicle cabin, controls air conditioning such that an environment inside the vehicle cabin becomes a desired environment by set estimated time of departure.

Abstract: A vehicle air conditioning system is configured to cool a passenger compartment having a first zone and a second zone. An air handler has a recirculation door movable from a first position in which only fresh air from outside the vehicle enters the air handler and a second position in which only recirculation air from the first zone enters the air handler. A controller is connected to the first sensor, the recirculation door and a control panel. The controller is configured such that in response to the control panel being set to: provide cooling only to the second zone; the recirculation door being set to provide fresh air; and a first sensor's conditions being meet, the controller changes the setting of the recirculation door from fresh air to recirculated air to the air handler over-riding a manual setting of the position of the recirculation door.

Abstract: A vehicle grill shutter system comprising at least one grill shutter and a controller. The grill shutter is movably coupled to a vehicle at a location forward of a radiator of the vehicle. The grill shutter comprises first and second portions. The first portion has a first surface and includes a first material having a first porosity, and the second portion has a second surface and includes a second material having a second porosity which is less porous than the first porosity. The controller is configured to operate the grill shutter, in response to a detected vehicle condition pertaining to the vehicle, to move between a first position at which the first surface is oriented transverse to a flow direction of air entering a grill of the vehicle toward the radiator and a second position at which the second surface is oriented transverse to the flow direction.

Abstract: A vehicle grill shutter system comprising at least one grill shutter and a controller. The grill shutter is movably coupled to a vehicle at a location forward of a radiator of the vehicle. The grill shutter comprises first and second portions. The first portion has a first surface and includes a first material having a first porosity, and the second portion has a second surface and includes a second material having a second porosity which is less porous than the first porosity. The controller is configured to operate the grill shutter, in response to a detected vehicle condition pertaining to the vehicle, to move between a first position at which the first surface is oriented transverse to a flow direction of air entering a grill of the vehicle toward the radiator and a second position at which the second surface is oriented transverse to the flow direction.

Abstract: Preventing high-voltage components which constitute an electric instrument stored in a case from being exposed, dropping out, or scattering to an outside from the case even when the case of an air-conditioning unit has a significant impact. Therefore, a vehicle air-conditioning unit is provided with a protecting structure for preventing the electric instrument from scattering.

Abstract: A vehicle air-conditioning system has an intake door that switches between an inside air recirculation mode to take in air from an inside air introduction port and an outside air introduction mode to take in air from an outside air introduction port, a blower that blows the air introduced through any of the inside air introduction port and the outside air introduction port toward inside of a vehicle cabin, a heater that heats the air blown by the blower, and a controller that activates the heater when there is a request for heating the inside of the vehicle cabin, controls air conditioning such that an environment inside the vehicle cabin becomes a desired environment by set estimated time of departure.

Abstract: Preventing high-voltage components which constitute an electric instrument stored in a case from being exposed, dropping out, or scattering to an outside from the case even when the case of an air-conditioning unit has a significant impact. Therefore, a vehicle air-conditioning unit is provided with a protecting structure for preventing the electric instrument from scattering.

Abstract: A vehicle air conditioning system includes an electric powered refrigerant compressing device, an evaporator, an electric heater, an air temperature determining component, a cabin interior temperature controlling component, an upper limit electric power setting component, and an electric power distribution controller. The evaporator receives refrigerant from the compressing device. The heater is downstream of the evaporator in an air passageway. The determining component determines a first air temperature upstream of the evaporator and a second air temperature between the evaporator and the heater. The controlling component sets a vehicle interior discharge air temperature at a position downstream of the heater to a target temperature. The power setting component sets an upper limit for power supplied to the compressing device and the heater.

Abstract: A vehicle air conditioning system includes an electric powered refrigerant compressing device, an evaporator, an electric heater, an air temperature determining component, a cabin interior temperature controlling component, an upper limit electric power setting component, and an electric power distribution controller. The evaporator receives refrigerant from the compressing device. The heater is downstream of the evaporator in an air passageway. The determining component determines a first air temperature upstream of the evaporator and a second air temperature between the evaporator and the heater. The controlling component sets a vehicle interior discharge air temperature at a position downstream of the heater to a target temperature. The power setting component sets an upper limit for power supplied to the compressing device and the heater.

Abstract: A timing adjusting circuit receives a clock and a data from an outside, and outputs the delayed data to the outside. A variable delay circuit receives the data and outputting the data delayed according to a value set by a delay value setting signal A first flip-flop has a data input terminal for inputting the data output from the variable delay circuit and a clock input terminal for receiving an inverse signal of the clock being frequency divided. A second flip-flop has a data input terminal for receiving a fixed value and a clock input terminal for receiving a signal output from the first flip-flop. A counter has a counter enable input terminal for inputting a signal output from the second flip-flop, counts the clock at every plural periods, and sends an output count value as the delay value setting signal to the variable delay circuit.

Abstract: A timing adjusting circuit receives a clock and a data from an outside, and outputs the delayed data to the outside. A variable delay circuit receives the data and outputting the data delayed according to a value set by a delay value setting signal A first flip-flop has a data input terminal for inputting the data output from the variable delay circuit and a clock input terminal for receiving an inverse signal of the clock being frequency divided. A second flip-flop has a data input terminal for receiving a fixed value and a clock input terminal for receiving a signal output from the first flip-flop. A counter has a counter enable input terminal for inputting a signal output from the second flip-flop, counts the clock at every plural periods, and sends an output count value as the delay value setting signal to the variable delay circuit.

Abstract: A multirate generator for generating a rate signal and a multirate signal having a subrate period and a subrate number which are set for each period of the rate signal, which comprises a rate signal generation unit, a multirate signal generation unit, and a multirate number detection unit. The multirate generator operates the rate signal generation unit and the multirate generation unit by means of the same clock and makes the rate signal generation unit and the multirate generation unit generate, respectively, a rate signal and a multirate signal, to generate a rate signal and a multirate signal which have been timing-adjusted without delay elements and the like, and without requiring a timing adjustment. The rate data, multirate data and multirate number data may be optionally set, to enable outputting a desired rate signal and a desired multirate signal.

Abstract: The object of the present invention is to offer a rate generator which is capable of generating rate signals of arbitrary time intervals over a wide range, from low speeds to high speeds. An N-bit (wherein N is a natural number) counter 1 counts up according to a clock signal 31. An adder 16 pairs off and adds consecutive rate data 32. An adder 17 pairs off and adds rate data 32 which has been shifted by a single step. An adder 18 sequentially adds the addition results of the adder 16. An adder 19 sequentially adds the addition results of the adder 17. A selector 4 alternately selects the addition results of the adder 18 and the addition results of the adder 19. A correspondence circuit 2 receives the output of the counter 1 as a first input and the output of the selector 4 as a second input, and detects matches between the two inputs. A pulse generation circuit 3 is inputted with the output of the correspondence circuit 2 and a clock signal 31, and outputs a rate signal 33.

Abstract: A rate generating portion generates a second rate signal comprising a desired first rate signal having arbitrary time intervals preceded by a preceding rate signal composed of (N+1) pulses, a data row generating portion composed of N logic circuits and N D-type flip-flops generates an arbitrary data row with the second rate signal as a synchronizing clock, a preceding rate masking circuit masks the preceding rate signal in the second rate signal to output the first rate signal and a D-type flip-flop receives the output of the data row generating portion at the data input terminal thereof and the output of the preceding rate masking circuit at the clock input terminal thereof to generate a data row in synchronism with the first rate signal. As a result, it is possible to provide a synchronous data row generating circuit which operates stably without using the conventional delay elements for adjustment since the data row generating portion therein is composed of synchronous circuits.

Abstract: A circuit for automatically adjusting duty cycle of an output clock signal is provided.

Abstract: A timing signal delay circuit comprises a counter placed with first delay setting data (21-24) for counting a first clock signal (12) in response to an input timing pulse (11), and a first flip-flop circuit which has a D-input supplied with the output of the counter (1) and a clock input supplied with a second clock signal of the same timing frequency as the first clock signal. For doubling resolution of the delay which the input timing pulse undergoes, there are provided an exclusive-OR gate (4) supplied with a second dealy data signal (31) and a third clock signal (14) of the same timing as the second clock signal (13), an AND gate (5) supplied with the output of the exclusive-OR gate (4) and that of the first flip-flop (3), and a second flip-flop supplied with the output of the AND gate (5) and a fourth clock signal (15) having twice as high frequency as that of the first clock (12). The input timing pulse can be delayed with high resolution or accuracy.