Control system for a vehicle air-conditioner

Claim 2

A control system for controlling driving of a compressor as a function of operating conditions of a source of motive power for driving the compressor comprising, first means for detecting three physical variables corresponding to variable operating conditions of a source of motive power and related with the power output thereof, second means coactive with said first means to developing a plurality of outputs corresponding respectively to the physical variables only and the power output of the source of motive power obtains at a predetermined level, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth means for clutching and declutching the power output of the source of motive power to nd from the compressor under control of the output of the third means.

Claim 3

A control system for controlling driving of a compressor as a function of operating conditions of a source of motive power for driving the compressor comprising, first means for detecting at least two physical variables corresponding to variable operating conditions of a source of motive power and related with the power output thereof, said first means including a pulse train generator driven from the source of motive power for generating a pulse train the Repetition rate of which is proportional to the speed of the source of motive power, expansible and contractible bellow means deformable in response to an intake manifold vacuum of the source of motive power, means coactive with said bellow means for electromagnetically converting the expansion and contraction of said bellow means into a voltage proportional to the absolute level of the intake manifold vacuum, and resistance means mounted in use on the source of motive power for producing an output having a resistance decreasing with the increase of the temperature of the source of motive power, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of the source of motive power obtains at a predetermined level, said second means including means for producing one of the outputs of the second means when the repetition rate of the pulse train is above a predetermined value, means for producing a second of the outputs of the second means when the voltage proportional to the absolute level of the intake manifold vacuum is above a predetermined level, means for producing a third of the outputs of the second means when the resistance of the output of said resistance means is above a predetermined value, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth means for clutching and declutching source of motive power to and from the compressor under control of the output of the third means.

Claim 4

A control system for controlling driving of a compressor as a function of operating conditions of a source of motive power for driving the compressor comprising, first means for detecting at least two physical variables corresponding to variable operating conditions of a source of motive power and related with the power output thereof, said first means including a pulse train generator driven from the source of motive power for generating a pulse train the Repetition rate of which is proportional to the speed of the source of motive power, expansible and contractible bellow means deformable in response to an intake manifold vacuum of the source of motive power, means coactive with said bellow means for electromagnetically converting the expansion and contraction of said bellow means into a voltage proportional to the absolute level of the intake manifold vacuum, and resistance means mounted in use on the source of motive power for producing an output having a resistance decreasing with the increase of the temperature of the source of motive power, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of the source of motive power obtains at a predetermined level, said second means including means for producing one of the outputs of the second means when the repetition rate of the pulse train is above a predetermined value, means for producing a second of the outputs of the second means when the voltage proportional to the absolute level of the intake manifold vacuum is above a predetermined level, means for producing a third of the outputs of the second means when the resistance of the output of said resistance means is above a predetermined value, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth means for clutching and declutching source of motive power to and from the compressor under control of the output of the third means.

Claim 5

A control system according to claim 2, in which said fourth means comprises means rendered effective for coupling the power output of the source of motive power to the compressor upon reception of the output of said third means.

Claim 6

A control system according to claim 2, in which said source of motive power comprises an intake manifold and in which said pulse train generator comprises a cam driven from the source of motive power, and a triggering switch driven by said cam for generating said pulse train; and in which said bellows means comprises a housing defining a chamber communicating with said intake manifold of the source of motive power, a gas-filled bellows at a predetermined pressure and secured to said housing, said bellows being disposed to expand and contract in said housing in response to the difference variations between the predetermined pressure therein and the pressure in said chamber, a rod secured to said gas-filled bellows and movable in said housing when said bellows expands and contracts, and a differential transformer mounted in said housing disposed relative to said gas-filled bellows for receiving said rod and electromagnetically converting the displacement of said rod into said voltage proportional to the absolute level of the intake manifold vacuum.

Claim 7

A control system according to claim 2, in which said means for producing one of the outputs when the repetition rate of the pulse train is above a predetermined level comprises a pulse train detector receptive of said pulse train for detecting said pulse train, a differentiator receptive of the detected pulse train for differentiating said detected pulse train, a clipper receptive of the differentiated pulse train for clipping said differentiated pulse train, an integrator receptive of the clipped pulse train for generating a voltage proportional to the speed of revolution of the source of motive power, a first comparator receptive of the voltage generated by said integrator for comparing said voltage with a predetermined voltage level and for producing said one of the outputs of the second means when the speed of revolution of the source of motive power is above a predetermined level; and in which said means for producing another of the outputs of said second means comprises a pulse generator receptive of said voltage converted by said bellows means for generating a single pulse the width of which is proportional to thE absolute level of the intake manifold vacuum, a rectifier receptive of the single pulse generated by said pulse generator for rectifying said single pulse and for generating a voltage porportional to the width of said single pulse, and a second comparator receptive of the voltage generated by said rectifier for comprising said voltage generated by said rectifier with a predetermined voltage level and for producing said another of the outputs of the second means when the absolute level of the intake manifold vacuum is below a predetermined level.

Claim 8

A control system according to claim 2, in which said other means for producing another of the outputs of said second means comprises a resistance determiner receptive of the output produced by said resistance means for determining the resistance of said output produced by said resistance means, a voltage converter connected to said resistance determiner for converting the resistance converted by said resistance determiner into a voltage corresponding to the value of said resistance, and a third comparator receptive of the voltage converted by said voltage converter for comparing said voltage converted by said voltage converter with a predetermined voltage level to produce said another of the outputs of the second means when the temperature of the source of motive power is below a predetermined level.

Claim 9

A control system according to claim 2, further comprising fifth means for sensing a temperature in a space including means rendered conductive to allow passage of said output of said third means to the fourth means when the temperature sensed in said space is above a predetermined level, whereby the fourth-named means clutches the power output of the source of motive power to the compressor when said temperature in said space is above said predetermined level.

Claim 10

A control system according to claim 7, in which said fifth means comprises a voltage divider including a thermistor in said space for sensing the temperature therein and a variable resistor connected to said thermistor, said means rendered conductive comprising a transistor for gating said output of the third means in accordance with the voltage divided by said voltage divider, and another transistor connected between said thermistor and variable resistor for rendering conductive the first-mentioned transistor.

Claim 11

In combination with a vehicle air-conditioner compressor, a control system for controlling driving of said compressor as a function of operating conditions of an engine of a vehicle, said control system comprising first means mounted in use on an engine of a vehicle for detecting three physical variables corresponding to variable operating conditions of said engine relating to the power output of said engine, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of said engine obtains at a predetermined level, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth means for clutching and declutching the power output of said engine to and from said compressor under control of the output of the third means.

Claim 12

In combination with a vehicle air-conditioner compressor, a control system for controlling driving of said compressor as a function of operating conditions of an engine of a vehicle, said control system comprising first means mounted in use on an engine of a vehicle for detecting three physical variables corresponding to variable operating conditions of said engine relating to the power output of said engine, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of said engine obtains at a predetermined level, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth means for clutching and declutching the power output of said engine to and from said compressor under control of the output of the third means.

Claim 13

A control system according to claim 9, in which said fourth means for clutching and declutching comprises means rendered effective for coupling the power output of said engine to said compressor upon reception of the output of said third means.

Claim 14

A control system according to claim 9, in which said first means comprises a pulse train generator driven from the source of motive power for generating a pulse train the repetition rate of which is proportional to the speed of the source of motive power, expansible and contractible bellow means deformable in response to an intake manifold vacuum of the source of motive power, means coactive with said bellow means for electromagnetically converting the expansion and contraction of said bellow mEans into a voltage proportional to the absolute level of the intake manifold vacuum, and resistance means mounted in use on said engine for producing and output having a resistance decreasing with the increase of the temperature of said engine, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of said engine obtains at a predetermined level, said second means including means for producing one of the outputs of the second means when the repetition rate of the pulse train is above a predetermined value, means for producing a second of the outputs of the second means when the voltage porportional to the absolute level of the intake manifold vacuum is above a predetermined level, and means for producing a third of the outputs of the second means when the resistance of the output of said resistance means is above a predetermined value.

Claim 15

In combination with a vehicle air-conditioner compressor mounted on a fuel injection engine driven vehicle, a control system for controlling driving of said compressor as a function of operating conditions of a fuel injection engine of a vehicle, said control system comprising, first means mounted in use on a fuel injection engine of a vehicle for detecting three physical variables, which are selected from parameters to be applied to a control system of said fuel injection engine, corresponding to variable operating conditions of said fuel injection engine and related with the power output thereof, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of said engine obtain at a predetermined level, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth means for clutching and declutching the power output of said engine to and from the compressor under control of the third means.

Claim 16

In combination with a vehicle air-conditioner compressor mounted on a fuel injection engine driven vehicle, a control system for controlling driving of said compressor as a function of operating conditions of a fuel injection engine of a vehicle, said control system comprising, first means mounted in use on a fuel injection engine of a vehicle for detecting three physical variables, which are selected from parameters to be applied to a control system of said fuel injection engine, corresponding to variable operating conditions of said fuel injection engine and related with the power output thereof, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of said engine obtain at a predetermined level, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth means for clutching and declutching the power output of said engine to and from the compressor under control of the third means.

Claim 17

In combination with a vehicle air-conditioner mounted on a fuel injection engine driven vehicle, a control system for controlling driving of said compressor as a function of operating conditions of a fuel injection engine of a vehicle, said control system comprising, first means for detecting three physical variables corresponding to variable operating conditions of a source of motive power and related with the power output thereof, said first means including a pulse train generator driven from the source of motive power for generating a pulse train the repetition rate of which is proportional to the speed of the source of motive power, expansible and contractible bellow means deformable in response to an intake manifold vacuum of the source of motive power, means coactive with said bellow means for electromagnetically converting the expansion and contraction of said bellow means into a voltage proportional to the absolute level of the intake manifold vacuum, and resistance means mounted in use on said engine for producing an output having a resistance decreasing with the increase of the temperature of said engine, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of said engine obtains at a predetermined level, said second means including means for producing one of the outputs of the second means when the repetition rate of the pulse train is above a predetermined value, means for producing a second of the output of the second means when the voltage proportional to the absolute level of the intake manifold vacuum is above a predetermined level, means for producing a third of the outputs of the second means when the resistance of the output of said resistance means is above a predetermined value, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth mEans for clutching and declutching source of motive power to and from the compressor under control of the output of the third means.

Claim 18

In combination with a vehicle air-conditioner mounted on a fuel injection engine driven vehicle, a control system for controlling driving of said compressor as a function of operating conditions of a fuel injection engine of a vehicle, said control system comprising, first means for detecting three physical variables corresponding to variable operating conditions of a source of motive power and related with the power output thereof, said first means including a pulse train generator driven from the source of motive power for generating a pulse train the repetition rate of which is proportional to the speed of the source of motive power, expansible and contractible bellow means deformable in response to an intake manifold vacuum of the source of motive power, means coactive with said bellow means for electromagnetically converting the expansion and contraction of said bellow means into a voltage proportional to the absolute level of the intake manifold vacuum, and resistance means mounted in use on said engine for producing an output having a resistance decreasing with the increase of the temperature of said engine, second means coactive with said first means for developing a plurality of outputs corresponding respectively to the physical variables only when the power output of said engine obtains at a predetermined level, said second means including means for producing one of the outputs of the second means when the repetition rate of the pulse train is above a predetermined value, means for producing a second of the output of the second means when the voltage proportional to the absolute level of the intake manifold vacuum is above a predetermined level, means for producing a third of the outputs of the second means when the resistance of the output of said resistance means is above a predetermined value, third means receptive of the outputs of the second means for developing an output only when said outputs are concurrently supplied thereto, and fourth mEans for clutching and declutching source of motive power to and from the compressor under control of the output of the third means.