1. A decoupling unit for two bus systems connected with each other, comprising:
a connecting circuit;
a first interface circuit including a bidirectional bus port for one of said bus systems and a bidirectional data port for said connecting circuit;
a second interface circuit including a bidirectional bus port for the other of said bus systems and a bidirectional data port for said connecting circuit;
the connecting circuit comprising filter means for blocking abnormal dominant signals and passing normal signals between said bus systems.
2. The decoupling unit as claimed in claim 1, wherein interface circuits convert bus signals into logic levels and logic levels into bus signals.
3. The decoupling unit as claimed in claim 1, wherein abnormal dominant signals of a bus system indicate a failure therein and occur during a period incompatible with a bus protocol of said bus systems.
4. The decoupling unit as claimed in claim 2, wherein said filter means contain a retriggerable monoflop.
5. The decoupling unit as claimed in claim 1, wherein said connecting circuit comprises gate means which, at least for a period of passage of a signal from a transmitting bus system to a receiving bus system, eliminates any feedback of said signal to said transmitting bus system.
6. The decoupling unit as claimed in claim 5, wherein said gate means has an OR gate with a first input to which a signal from a data port of one interface circuit is applied, and a second input to which an inverted signal from a data port of said other interface circuit is applied.
7. The decoupling unit as claimed in claim 6, wherein said inverted signal is delayed at said second input of said OR gate by an RC combination.
8. The decoupling unit as claimed in claim 1, wherein said connecting circuit is symmetrical between said interface circuits.
9. The decoupling unit as claimed in claim 1, characterized by being used in a motor vehicle, where the integrity of one bus system is susceptible of being affected by an accident and said other bus system is allocated to functions of a higher priority.
10. The decoupling unit as claimed in claim 9, wherein an internal CAN bus is connected with a peripheral CAN bus.
11. A decoupling unit for two interconnected two-wire bus systems, comprising:
a switch that, when activated, electrically disconnects said bus systems;
a DC voltage detector providing a control signal when a DC voltage is detected between said wires of the same bus system;
a signal failure detector providing a control signal in case no signals occur on one of said bus systems; and
a driving circuit that activates said switch in response to the driving signals.
12. The decoupling unit as claimed in claim 11, wherein said DC voltage detector comprises an integrator and an input signal of said integrator is derived by a voltage divider connected across said two wires of one of said bus systems.
13. The decoupling unit as claimed in claim 11, wherein said signal failure detector comprises a retriggerable monoflop, the input signal of which is taken between said two wires of the one bus system.
14. The decoupling unit as claimed in claim 11, wherein said control signals of said DC voltage detector and said signal failure detector are applied to a pair of inputs of an OR gate an output of which is connected to an input of said driver circuit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A climate control system for a cabberth of a vehicle, comprising:
an energy accumulator enclosing an accumulator refrigerant;
a climate control circuit in which a first refrigerant different from the accumulator refrigerant circulates between at least the energy accumulator in which the accumulator refrigerant is isolated from and in heat exchange with the first refrigerant, a radiator in which the first refrigerant is in heat exchange with a fluid blown in the cabberth to adjust a temperature of the cabberth, and a heat-exchange unit;
a refrigeration circuit in which a second refrigerant different from the accumulator refrigerant circulates between a compression stage, a condensation stage, an expansion stage and an evaporation stage for submitting the second refrigerant to a refrigeration cycle, the compression stage having at least one electrically powered compressor, and the evaporation stage being in direct heat-exchange relation with the heat-exchange unit of the climate control circuit such that the second refrigerant absorbs heat from the first refrigerant; and
a controller system powered by an electric power source of the vehicle and selectively actuating the climate control circuit and the refrigeration circuit so as to store cold energy in the energy accumulator when the vehicle is turned on and charges the electric power source, and selectively actuating the climate control circuit to cool the fluid blown in the cabberth with the radiator.
2. The climate control system according to claim 1, wherein the climate control circuit has a heating unit, and the controller system is adapted to selectively store hot energy in the energy accumulator, and actuate the climate control circuit to heat the fluid blown in the cabberth with the radiator.
3. The climate control system according to claim 1, wherein the accumulator refrigerant changes phase when storing cold energy.
4. A climate control system for a cabberth of a vehicle, comprising:
an operator interface for receiving a set point temperature for the cabberth from an operator;
an energy accumulator enclosing an accumulator refrigerant;
a climate control circuit in which a first refrigerant different and isolated from the accumulator refrigerant circulates between at least the energy accumulator in which the accumulator refrigerant is in heat exchange with the first refrigerant, a heating unit to heat the first refrigerant, a radiator in which the first refrigerant is in heat exchange with a fluid blown in the cabberth to adjust a temperature of the cabberth, and a heat-exchange unit;
a refrigeration circuit in which a second refrigerant circulates between a compression stage, a condensation stage, an expansion stage and an evaporation stage for submitting the second refrigerant to a refrigeration cycle, the evaporation stage being in direct heat-exchange relation with the heat-exchange unit of the climate control circuit such that the second refrigerant absorbs heat from the first refrigerant;
sensors to monitor at least a temperature of the accumulator refrigerant, an outdoor temperature, and a cabberth temperature;
an energy level calculator associated with the sensors to calculate a required energy level of the energy accumulator as a function of temperature readings of the sensors; and
an operation controller connected to the electric power source of the vehicle and connected to the energy level calculator, the operation controller being provided for one of (1) actuating the refrigeration circuit and the climate control circuit without the heating unit to store cold energy in the energy accumulator, and (2) actuating the climate control circuit with the heating unit to store hot energy in the energy accumulator, with operations (1) and (2) being selected as a function of the energy level of the energy accumulator and of the set point temperature, and for (3) actuating the climate control circuit to treat the fluid blown in the cabberth by circulating the first refrigerant in the radiator.
5. The climate control system according to claim 4, further comprising a power level calculator connected to the operation controller so as to monitor a power level of the electric power source of the vehicle and indicate when any of operations (1), (2) and (3) is to be performed as a function of the power level of the electric power source.
6. The climate control system according to claim 5, wherein the power level calculator indicates that the operations (1) and (2) can be performed when the vehicle is running.
7. The climate control system according to claim 4, further comprising a power accumulator connected to the operation controller for accumulating electric power from the electric power source of the vehicle, whereby the climate control system is powered by the power accumulator when the vehicle is turned off.
8. The climate control system according to claim 7, further comprising a power level calculator connected to the operation controller so as to monitor a power level of the electric power source of the vehicle and indicate when electric power can be accumulated in the power accumulator as a function of the power level of the electric power source.
9. The climate control system according to claim 8, wherein the power level calculator is connected to the operation controller so as to monitor the power level of the electric power source of the vehicle and indicate when any of operations (1), (2) and (3) is to be performed as a function of the power level of the electric power source.
10. The climate control system according to claim 4, wherein the heating unit of the climate control circuit has a burner burning vehicle fuel to heat the first refrigerant.
11. The climate control system according to claim 4, wherein any one of the operations (1) and (2) performed by the operation controller are performed simultaneously with the operation (3).
12. The climate control system according to claim 4, wherein the accumulator refrigerant changes phase during one of the operations (1) and (2).