FR3139914A1 - MONITORING OVERVOLTAGES AT THE TERMINALS OF AN AIR CONDITIONING COMPRESSOR OF A HEATING/AIR CONDITIONING INSTALLATION OF A SYSTEM - Google Patents

Abstract

A monitoring method is implemented in a system comprising a heating/air conditioning installation, comprising an air conditioning compressor having a measurable voltage at its terminals, and a battery, coupled to a main electrical circuit to which said air conditioning compressor is coupled. This monitoring method comprises a step (10-30) in which, when the measured voltage is greater than a first chosen threshold, the electrical supply of the air conditioning compressor by the battery is prohibited. Figure 3

Description

MONITORING OVERVOLTAGES AT THE TERMINALS OF AN AIR CONDITIONING COMPRESSOR OF A HEATING/AIR CONDITIONING INSTALLATION OF A SYSTEM Technical field of the invention

The invention relates to systems comprising a heating/air conditioning installation comprising an electric air conditioning compressor coupled to a main electrical circuit, and more specifically the monitoring within such systems of overvoltages of the air conditioning compressor.

State of the art

Many systems, such as vehicles (possibly of the automobile type), include a heating/air conditioning installation, comprising an (electric) air conditioning compressor, and a battery coupled, just like the air conditioning compressor, to a main electrical circuit (sometimes called “high voltage”). Note that when the system is a vehicle, the battery is called main (or traction) because it is responsible for supplying electrical energy via the main electrical circuit to an electric motor machine forming part of the powertrain (or GMP ) and a converter responsible, in particular, for supplying converted electrical energy to at least one on-board network of the vehicle.

In the aforementioned systems, an overvoltage can occur at the terminals of the electric motor, even though the latter is not designed for this purpose. Such an overvoltage generally originates from the battery (in particular when it is of the rechargeable type (for example with electrochemical cells)) or the isolation circuit associated with the battery (and which notably includes contactors (or switches) which can create overcurrents when they close)).

Currently, when such an overvoltage occurs, it is not detected at the terminals of the air conditioning compressor and therefore the latter continues to operate, which can cause the air conditioning compressor to break and/or the compressor electronics to overheat. air conditioning which could cause a fire in the latter which could then spread to the rest of the vehicle.

The invention therefore aims in particular to improve the situation.

Presentation of the invention

It proposes in particular for this purpose a monitoring method intended to be implemented in a system comprising a heating/air conditioning installation, comprising an air conditioning compressor having a measurable voltage at its terminals, and a battery, coupled to a main electrical circuit to which the air conditioning compressor is also coupled.

This monitoring method is characterized by the fact that it comprises a step in which, when the voltage measured at the terminals of the air conditioning compressor is greater than a first chosen threshold, the electrical supply of the air conditioning compressor by the battery is prohibited.

Thanks to the invention, as soon as a significant overvoltage is detected at the terminals of the air conditioning compressor, we stop supplying it electrically temporarily, and therefore it no longer risks breaking, just as there is no longer any risk of overheating of its electronics and therefore more risk of fire from the air conditioning compressor, which reinforces the safety of the system and its users.

The monitoring method according to the invention may include other characteristics which can be taken separately or in combination, and in particular:

- in its step, the power supply to the air conditioning compressor by the battery can be prohibited when the voltage measured at the terminals of the air conditioning compressor is greater than the first threshold for at least a first chosen duration;

- in the presence of the last option, in its step the first duration can be between 500 ms and 1500 ms;

- in its stage, in the presence of a normal voltage at the terminals of the air conditioning compressor of between 350 V and 450 V, the first threshold can be between 460 V and 480 V;

- in its stage, in the event of a ban on the electrical supply to the air conditioning compressor, it is also possible to carry out in the system at least one complementary action chosen from a generation of a first alert from a user of the system signaling a shutdown temporary air conditioning, and a recording of at least one first fault code representative of a first overvoltage problem at the terminals of the air conditioning compressor;

- in its step, when the voltage measured at the terminals of the air conditioning compressor is greater than a second threshold, chosen and lower than the first threshold, but lower than the first threshold for at least a second chosen duration, it is possible to carry out in the system at least a complementary action chosen from a generation of a second alert from a user of the system signaling at least one fault in the main electrical circuit, and a recording of at least one second fault code representative of a second overvoltage problem at the terminals the air conditioning compressor;

- in the presence of the last option, in its stage, in the presence of a normal voltage at the terminals of the air conditioning compressor of between 350 V and 450 V, the second threshold can be between 455 V and 465 V;

- also in the presence of the last option, in its stage, the second duration can be between 500 ms and 1500 ms;

- in its step, the power supply to the air conditioning compressor can be re-authorized by the main battery after waking up the system after falling asleep in the presence of a ban on the power supply to the air conditioning compressor, or when the voltage measured across the air conditioning compressor becomes lower than a third chosen threshold for at least a third chosen duration;

- in the presence of the last option, in its step, the third threshold can be equal to the first threshold;

- also in the presence of the last option, in its step, the third duration can be between 100 ms and 1000 ms.

The invention also proposes a computer program product comprising a set of instructions which, when executed by processing means, is capable of implementing a monitoring method of the type of that presented above, in a system comprising a heating/air conditioning installation, comprising an air conditioning compressor having a measurable voltage at its terminals, and a battery, coupled to a main electrical circuit to which the air conditioning compressor is also coupled, to monitor this voltage measured at the terminals of the air conditioning compressor.

The invention also proposes a monitoring device intended to equip a system comprising a heating/air conditioning installation, comprising an air conditioning compressor having a measurable voltage at its terminals, and a battery, coupled to a main electrical circuit to which the air conditioning compressor.

This monitoring device is characterized by the fact that it comprises at least one processor and at least one memory arranged to carry out the operations consisting, when the voltage measured at the terminals of the air conditioning compressor is greater than a first chosen threshold, in triggering a prohibition of the electrical supply of the air conditioning compressor by the battery.

The invention also proposes a system comprising, on the one hand, a heating/air conditioning installation, comprising an air conditioning compressor having a measurable voltage at its terminals, and a battery, coupled to a main electrical circuit to which the compressor is also coupled air conditioning, and, on the other hand, a monitoring device of the type of that presented above.

For example, this system can be a vehicle, possibly of the automobile type.

Brief description of the figures

Other characteristics and advantages of the invention will appear on examination of the detailed description below, and the appended drawings, in which:

schematically and functionally illustrates an exemplary embodiment of a vehicle comprising a powertrain with an electric driving machine, a heating/air conditioning installation with an electric air conditioning compressor coupled to a main electrical circuit to which a main battery is also coupled, and a device for monitoring according to the invention,

schematically and functionally illustrates an exemplary embodiment of a supervision computer comprising an exemplary embodiment of a monitoring device according to the invention, and

schematically illustrates an example of an algorithm implementing a monitoring method according to the invention.

Detailed description of the invention

The invention aims in particular to propose a monitoring method, and an associated DS monitoring device, intended to enable monitoring of the voltage at the terminals of an electric air conditioning compressor CPI of a heating/air conditioning installation IC d 'a system S, in order to detect overvoltages.

In what follows, we consider, by way of non-limiting example, that the system S is a motor vehicle. This is for example a car, as illustrated in the . But the invention is not limited to this type of system. It concerns in fact any type of system comprising a heating/air conditioning installation, comprising an (electric) air conditioning compressor, and a battery coupled, just like the air conditioning compressor, to a main electrical circuit. Thus, it concerns, for example, land vehicles (utility vehicles, motorhomes, minibuses, coaches, trucks, motorcycles, road machinery, construction machinery, agricultural machinery, leisure machinery (snowmobile, kart), and road machinery. caterpillar(s), for example), boats, aircraft, installations (possibly industrial), and buildings.

Furthermore, we consider in what follows, by way of non-limiting example, that the system S (here a motor vehicle) comprises a powertrain (or GMP) of all-electric type (and therefore whose traction is ensured exclusively by at least one electric driving machine MME). But the GMP could be of hybrid type (thermal and electric) or purely thermal.

We have schematically represented on the a system (here a vehicle) S comprising an electric GMP transmission chain, an on-board network RB, a utility battery BS, a main battery BP, a heating/air conditioning installation IC with (electric) air conditioning compressor CPI, a CV converter, a main electrical circuit CEP, and a DS monitoring device according to the invention.

Although it does not appear on the , the vehicle S includes a passenger compartment which is supplied with treated air by the heating/air conditioning installation IC. When the air conditioning mode is selected (by a user or by programming or even by necessity) the CPI air conditioning compressor is electrically powered and therefore has a uc voltage at its terminals. This voltage uc is measurable by a sensor C1 of the system S. Note that in the example illustrated non-limitingly on the the C1 sensor is part of the CPI air conditioning compressor. But this is not obligatory. So it could, for example, be part of the BB battery box described later.

The RB on-board network is an electrical supply network to which electrical (or electronic) equipment (or components) are coupled which consume electrical energy.

The transmission chain has a GMP which is, here, purely electric and therefore which includes, in particular, an electric driving machine MME, an AM motor shaft, and an AT transmission shaft. Here we mean “electric driving machine” an electric machine arranged so as to provide torque to move the vehicle S when it is supplied with electrical energy (we then speak of providing a positive output torque), as well as possibly to recover torque in the transmission chain (we then speak of providing a negative output torque).

The operation of the transmission chain (and therefore of the GMP) is supervised by a CS supervision computer.

The electric driving machine MME (here an electric motor) is here coupled to the main battery BP via the main electrical circuit CEP, in order to be supplied with electrical energy, as well as possibly to supply this main battery BP with electrical energy, for example during a regenerative braking phase. But this MME electric driving machine could be supplied with electrical energy by a fuel cell.

Furthermore, this electric motor machine MME is coupled to the motor shaft AM, in particular to provide it by rotational drive with an output torque which is a function of a torque setpoint defined by the supervision computer CS.

The motor shaft AM is here coupled to a reduction gear RD which is also coupled to the transmission shaft AT, itself coupled to a first train T1 (here of wheels), preferably via a differential DV. But it (AM) could be coupled to a gearbox.

This first train T1 is here located in the front part PVV of the vehicle S. But in a variant this first train T1 could be the one which is here referenced T2 and which is located in the rear part PRV of the vehicle S.

The operation of the electric driving machine MME is controlled by an associated machine computer CM and which receives in particular each torque setpoint defined by the supervision computer CS and defining the output torque that the electric driving machine MME must provide or the torque d the input that the MME electric driving machine must recover.

The main (or high voltage) electrical circuit CEP is connected, on the one hand, to the main battery BP, and, on the other hand, to electronic equipment, such as for example the CV converter, the air conditioning compressor CPI and the electric driving machine MME. It also allows the main BP battery to be recharged by an external power source and temporarily coupled to a vehicle charging connector S.

The utility battery BS is responsible for supplying electrical energy to the on-board network RB, in addition, here, to that supplied by the CV converter supplied by the main battery BP via the main electrical circuit CEP, and sometimes instead , here, of this CV converter. For example, this BS utility battery can be arranged in the form of a very low voltage type battery (typically 12 V, 24 V or 48 V). It is rechargeable at least via the CV (current) converter. We consider in the following, by way of non-limiting example, that the BS utility battery is of the 12 V Lithium-ion type.

The BP battery is here called main (or traction) because it is responsible for supplying electrical energy to the electric motive machine MME via part of the main electrical circuit CEP. It also supplies electrical energy to the air conditioning compressor CPI and the CV converter via two other parts of the main electrical circuit CEP, different from that which is coupled to the electric prime mover MME.

This main BP battery can, for example, include electrical energy storage cells, possibly electrochemical (for example of the lithium-ion (or Li-ion) or Ni-Mh or Ni-Cd type). Also for example, the main BP battery can be of the low voltage type (typically 450 V for illustration purposes, and in this case, the normal voltage at its terminals can vary between 350 V and 450 V). But it could be medium voltage or high voltage.

Furthermore, the main battery BP is (here) associated with a battery box BB which includes internal voltage/current/temperature measuring means (not shown), an isolation circuit (not shown), and a power calculator. CB battery. This CB battery calculator centralizes current measurements, voltage measurements and internal temperature measurements (inside the main BP battery), and determines parameters of the main BP battery according to these measurements, and in particular its internal resistance, its minimum voltage and its current state of charge (or SOC (“State Of Charge”)).

Note, as illustrated non-limitatively in the , that the CV converter can be part of a charger CH electrically connected to the charging connector and comprising a charging calculator (not illustrated) responsible within its vehicle S for at least controlling the charging of the main battery BP, which whatever the mode.

It will also be noted that in the example illustrated non-limitingly on the the vehicle S also includes a distribution box BD to which the utility battery BS, the CV converter and the on-board network RB are coupled. This distribution box BD is responsible for distributing in the on-board network RB the electrical energy stored in the utility battery BS or produced by the converter CV, for powering the electrical components (or equipment) coupled to the on-board network RB depending on power requests received (in particular from the GMP CS supervision computer).

As mentioned above, the invention proposes in particular a monitoring method intended to allow monitoring of the voltage uc at the terminals of the air conditioning compressor CPI of the heating/air conditioning installation IC of the system S, to detect overvoltages.

This (monitoring) method can be implemented at least partially by the monitoring device DS (illustrated at least partially in Figures 1 and 2) which comprises for this purpose at least one processor PR1, for example a digital signal (or DSP (“Digital Signal Processor”)), and at least one MD memory. This DS monitoring device can therefore be produced in the form of a combination of electrical or electronic circuits or components (or “hardware”) and software modules (or “software”). For example, it can be a microcontroller.

The memory MD is RAM in order to store instructions for the implementation by the processor PR1 of at least part of the monitoring process. The processor PR1 may include integrated (or printed) circuits, or several integrated (or printed) circuits connected by wired or non-wired connections. By integrated (or printed) circuit we mean any type of device capable of performing at least one electrical or electronic operation.

In the example illustrated without limitation in Figures 1 and 2, the monitoring device DS is part of the supervision computer CS. This is advantageous because it is the latter (CS) which supervises the operation of the transmission chain and gives authorizations and orders for isolation of the main battery BP from all or part of the main electrical circuit CEP (in particular so that the compressor air conditioning system CPI is no longer temporarily electrically powered). But this is not obligatory. Indeed, the DS monitoring device could include its own dedicated computer, which is then coupled to the CS supervision computer, or could be part of another on-board computer than the latter (CS), such as for example the battery computer. CB.

As illustrated without limitation on the , the (monitoring) method, according to the invention, comprises a step 10-30 which is implemented when the main battery BP supplies the air conditioning compressor CPI so that it operates.

Step 10-30 of the method comprises a sub-step 20 in which, when the voltage uc measured at the terminals of the air conditioning compressor CPI (by the sensor C1) is greater than a first threshold s1 chosen, we prohibit (the device DS monitoring triggers the prohibition of) the electrical supply to the air conditioning compressor CPI by the main battery BP.

In other words, when we have uc > s1 we consider that the air conditioning compressor CPI is subject to a potentially dangerous overvoltage, and therefore we temporarily stop powering it electrically. To do this, we can, for example, open one or more contactors (or switches) of the isolation circuit of the BB battery box. The CPI air conditioning compressor is no longer electrically powered temporarily, so it is no longer subject to overvoltages. Consequently, there is no longer any risk of breaking, just as there is no longer any risk of its electronics overheating and therefore no more risk of fire from the CPI air conditioning compressor. The invention therefore advantageously makes it possible to reinforce the security of the system S and its users (or passengers).

For example, and as illustrated without limitation on the , step 10-30 may include a sub-step 10 in which (the monitoring device DS) compares, preferably periodically, the measured voltage uc to the first threshold s1. If the measured voltage uc is less than or equal to the first threshold s1, we (the monitoring device DS) performs substep 10 again with the following measured voltage uc. On the other hand, if the measured voltage uc is greater than the first threshold s1, we (the monitoring device DS) carry out substep 20 in order to at least prohibit the electrical supply of the air conditioning compressor CPI by the main battery BP.

Also, the aforementioned period can be between 50 ms and 150 ms. As an illustrative example, this period can be equal to 100 ms. But other period values can be used. For example, the period can be chosen during the development phase of the S system.

Also for example, in substep 10 of step 10-30, in the presence of a normal voltage across the air conditioning compressor CPI between 350 V and 450 V, the first threshold s1 can be between 460 V and 480 V. As an illustrative example, the first threshold s1 can be equal to 470 V. But other values of first threshold s1 can be used (this depends in particular on the main battery BP). For example, the value of the first threshold s1 can be chosen during the development phase of a system similar to system S.

Note that in substep 20 of step 10-30 it is possible to prohibit (the monitoring device DS can trigger the prohibition of) the electrical supply of the air conditioning compressor CPI by the main battery BP when the voltages uc measured successively at the terminals of the air conditioning compressor CPI are all greater than the first threshold s1 for at least a first chosen duration d1. This option makes it possible to avoid taking into account a single incorrect or occasionally abnormal uc measured voltage (compared to the other uc voltages measured just before or just after) which would cause the main action to be carried out immediately (i.e. the prohibition of the power supply to the CPI air conditioning compressor by the main battery BP).

For example, the first duration d1 can be between 500 ms and 1500 ms. As an illustrative example, the first duration d1 can be equal to 1000 ms. But other values of first duration d1 can be used. For example, the first duration d1 can be chosen during the development phase of the system S.

In order to determine the duration of a first overvoltage problem at the terminals of the air conditioning compressor CPI, we (the machine computer CM) can trigger in substep 10 a first time delay equal to the first duration d1 as soon as the measured voltage uc becomes greater than the first threshold s1 for the first time. When this first duration d1 expires (and we still have uc > s1), we (the monitoring device DS) decide in substep 20 to prohibit the electrical supply of the air conditioning compressor CPI by the main battery BP.

It will also be noted that in sub-step 20 of step 10-30, in the event of a ban on the power supply to the air conditioning compressor CPI, it is also possible to carry out (the monitoring device DS can also trigger the implementation) in the system S with (at) least one complementary action chosen from:

- the generation of a first alert from a user of the system S intended to signal a temporary shutdown of the air conditioning, and

- recording at least a first fault code which is representative of a first overvoltage problem at the terminals of the CPI air conditioning compressor.

Preferably, the first alert requests a check of the S system by an after-sales service technician.

This first user alert can be done, for example, by means of a lit indicator light (for example on the dashboard when the system S is a vehicle) and/or a message displayed on at least one screen of the system S (for example from the dashboard or a central handset when the system S is a vehicle) or on the screen of a smart phone (or “smartphone”) of the user, and/or broadcast by at least speaker of the S system or this smartphone.

The recording of at least one first fault code representative of a first overvoltage problem at the terminals of the CPI air conditioning compressor is intended to facilitate the search for the origin of such an overvoltage by a technician from an after-service service. sale, and to allow this technician to solve the problem and to inform the user of the S system of the origin of this overvoltage. For example, the CS supervision computer can store this first fault code.

It will also be noted that in step 10-30, when the measured voltage uc is greater than a second threshold s2, which is chosen and lower than the first threshold s1, but lower than the first threshold s1 for at least a second chosen duration d2 ( i.e. s2 < uc < s1), it is possible to carry out (the monitoring device DS can also trigger the execution) in the system S with (at) least one other complementary action chosen from:

- the generation of a second alert from a user of the system S intended to signal at least one fault in the main electrical circuit CEP, and

- recording at least one second fault code which is representative of a second overvoltage problem at the terminals of the CPI air conditioning compressor.

We thus have, in a way, a pre-alert, which is not necessarily followed by a ban on the electrical supply to the air conditioning compressor CPI (because the measured voltage uc must then become greater than the first threshold s1).

For example, in substep 10 of step 10-30, we (the monitoring device DS) can also compare each measured voltage uc to the second threshold s2. If the measured voltage uc is less than or equal to the second threshold s2, we (the monitoring device DS) performs substep 10 again with the following measured voltage uc. On the other hand, if the measured voltage uc is greater than the second threshold s2 but less than the first threshold s1 for at least the second duration d2, we (the monitoring device DS) perform a variant of sub-step 20 so that the second alert user code is generated and/or at least one second fault code is recorded.

Also for example, in substep 10 of step 10-30, in the presence of a normal voltage across the air conditioning compressor CPI between 350 V and 450 V, the second threshold s2 can be between 455 V and 465 V. As an illustrative example, the second threshold s2 can be equal to 460 V. But other values of second threshold s2 can be used (this depends in particular on the main battery BP). For example, the value of the second threshold s2 can be chosen during the development phase of a system similar to system S.

Also for example, the second duration d2 can be between 500 ms and 1500 ms. As an illustrative example, the second duration d2 can be equal to 1000 ms. But other values of second duration d2 can be used. For example, the second duration d2 can be chosen during the development phase of the system S.

When the second duration d2 is different from the first duration d1, we (the machine computer CM) can trigger in substep 10 a second time delay equal to the second duration d2 as soon as the measured voltage uc becomes greater than the second threshold s2 for the first time (while being lower than the first threshold s1). When this second duration d2 expires (and we still have s2 < uc < s1), we (the monitoring device DS) decide in the variant of sub-step 20 to generate the second user alert and/or to record at least one second fault code.

Preferably, the second alert requests a check of the system S by an after-sales service technician.

This second user alert can be done, for example, by means of a lit indicator light (for example on the dashboard when the system S is a vehicle) and/or a message displayed on at least one screen of the system S (for example from the dashboard or a central handset when the S system is a vehicle) or on the screen of the user's smartphone, and/or broadcast by at least one speaker of the S system or of this smartphone.

The recording of at least a second fault code representative of a second overvoltage problem at the terminals of the CPI air conditioning compressor is intended to facilitate the search for the origin of such an overvoltage by a technician from an after-service service. sale, and to allow this technician to solve the problem and to inform the user of the S system of the origin of this overvoltage. For example, the CS supervision computer can store this second fault code (which is preferably different from the first fault code).

It will also be noted that step 10-30 may also include a sub-step 30 in which (the monitoring device DS) re-authorizes the power supply to the air conditioning compressor CPI by the main battery BP when a predefined condition is satisfied. At least two predefined conditions can be used.

A first predefined condition is satisfied after waking up the system S after it has fallen asleep in the presence of a ban on the electrical supply to the air conditioning compressor CPI.

A second predefined condition is satisfied when the measured voltage uc becomes lower than a third chosen threshold s3 for at least a third chosen duration d3.

For example, the third threshold s3 can be equal to the first threshold s1. But this is not obligatory. Thus, the third threshold s3 could be between the second thresholds s2 and first s1, for example.

Also for example, the third duration d3 can be between 100 ms and 1000 ms. As an illustrative example, the third duration d3 can be equal to 500 ms. But other values of third duration d3 can be used. For example, the third duration d3 can be chosen during the development phase of the system S.

Preferably, during a re-authorization we also stop generating a (the DS monitoring device stops triggering the generation of a) first alert for the user, when this additional action is planned.

Note also, as illustrated non-limitatively in the , that the supervision computer CS (or the computer of the monitoring device DS) can also include a mass memory MM1, in particular for storing the measured voltages uc, as well as any intermediate data involved in all its calculations and processing. Furthermore, this CS supervision calculator (or the DS monitoring device calculator) can also include an IE input interface for receiving at least the measured voltages uc, to use them in calculations or processing, possibly after having shaped them and/or demodulated and/or amplified them, in a manner known per se, by means of a digital signal processor PR2. In addition, this supervision computer CS (or the computer of the monitoring device DS) can also include an output interface IS, in particular to deliver a message (or order) prohibiting the electrical supply of the air conditioning compressor CPI, a message (or order) to end the ban on power supply to the CPI air conditioning compressor (in the event of re-authorization decided), a possible user alert message, and a possible message containing a fault code.

It will also be noted that the invention also proposes a computer program product (or computer program) comprising a set of instructions which, when executed by processing means of the electronic circuit (or hardware) type, such as for example the processor PR1, is capable of implementing the monitoring method described above to monitor the voltage across the terminals of the air conditioning compressor CPI of the heating/air conditioning installation IC of the system S in order to detect overvoltages.

Claims (10)

Monitoring method for a system (S) comprising a heating/air conditioning installation (IC), comprising an air conditioning compressor (CPI) having a measurable voltage at its terminals, and a battery (BP), coupled to a main electrical circuit ( CEP) to which said air conditioning compressor (CPI) is coupled, characterized in that it comprises a step (10-30) in which, when said measured voltage is greater than a first chosen threshold, the electrical supply to said compressor is prohibited air conditioning (CPI) by said battery (BP). Method according to claim 1, characterized in that in said step (10-30) the electrical supply of said air conditioning compressor (CPI) is prohibited by said battery (BP) when said measured voltage is greater than said first threshold for at least one first chosen duration. Method according to claim 1 or 2, characterized in that in said step (10-30), in the presence of a normal voltage across said air conditioning compressor (CPI) of between 350 V and 450 V, said first threshold is included between 460 V and 480 V. Method according to one of claims 1 to 3, characterized in that in said step (10-30), in the event of a ban on the electrical supply to said air conditioning compressor (CPI), it is also carried out in said system (S ) at least one complementary action chosen from a generation of a first alert from a user of said system (S) signaling a temporary shutdown of the air conditioning, and a recording of at least a first fault code representative of a first problem of overvoltage at the terminals of said air conditioning compressor (CPI). Method according to one of claims 1 to 4, characterized in that in said step (10-30), when said measured voltage is greater than a second threshold, chosen and lower than said first threshold, but lower than said first threshold for at least a second chosen duration, at least one complementary action is carried out in said system (S) chosen from a generation of a second alert from a user of said system (S) signaling at least one fault in said main electrical circuit (CEP), and a recording of at least a second fault code representative of a second overvoltage problem at the terminals of said air conditioning compressor (CPI). Method according to claim 5, characterized in that in said step (10-30), in the presence of a normal voltage across said air conditioning compressor (CPI) of between 350 V and 450 V, said second threshold is between 455 V and 465 V. Method according to one of claims 1 to 6, characterized in that in said step (10-30) the electrical supply of said air conditioning compressor (CPI) is re-authorized by said main battery (LP) after a wake-up of said system (S) subsequent to falling asleep in the presence of a ban on the electrical supply to said air conditioning compressor (CPI), or when said measured voltage becomes lower than a third chosen threshold for at least a third chosen duration. Computer program product comprising a set of instructions which, when executed by processing means, is capable of implementing the monitoring method according to one of claims 1 to 7, in a system (S) comprising a heating/air conditioning installation (IC), comprising an air conditioning compressor (CPI) having a measurable voltage at its terminals, and a battery (BP), coupled to a main electrical circuit (CEP) to which said air conditioning compressor is coupled (CPI), to monitor said measured voltage. Monitoring device (DS) for a system (S) comprising a heating/air conditioning installation (IC), comprising an air conditioning compressor (CPI) having a measurable voltage at its terminals, and a battery (BP), coupled to a circuit main electrical unit (CEP) to which said air conditioning compressor (CPI) is coupled, characterized in that it comprises at least one processor (PR1) and at least one memory (MD) arranged to carry out the operations consisting, when said measured voltage is greater than a first chosen threshold, to trigger a ban on the electrical supply to said air conditioning compressor (CPI) by said battery (BP). System (S) comprising a heating/air conditioning installation (IC), comprising an air conditioning compressor (CPI) having a measurable voltage at its terminals, and a battery (BP), coupled to a main electrical circuit (CEP) to which is coupled said air conditioning compressor (CPI), characterized in that it further comprises a monitoring device (DS) according to claim 9.