WO2016156733A1

WO2016156733A1 - System for a motor vehicle

Info

Publication number: WO2016156733A1
Application number: PCT/FR2016/050708
Authority: WO
Inventors: Sébastien Potteau; Benoit COFFIN; Ryosuke Izawa
Original assignee: Valeo Systemes De Controle Moteur
Priority date: 2015-03-27
Filing date: 2016-03-29
Publication date: 2016-10-06
Also published as: FR3034049B1; FR3034049A1

Abstract

The invention relates to a system (1) for a motor vehicle, this system comprising; equipment (2) of the motor vehicle, an electric machine (3) configured to start an internal combustion engine (4) of the vehicle, this machine also being configured to operate the equipment mechanically.

Description

System for a motor vehicle

The present invention relates to a system for a motor vehicle, in particular a truck or a bus.

US Pat. No. 6,823,690 and Patent Application JP9324668 disclose an air conditioning compressor.

The invention aims to improve this type of system. The invention thus relates to a system for a motor vehicle, this system comprising:

an equipment of the motor vehicle, an electrical machine configured to provide torque to an internal combustion engine of the vehicle, in particular for starting the combustion engine, this machine being further configured to mechanically operate the equipment.

Thanks to the invention, it is not necessary to dedicate an electric machine to the operation of the equipment. Indeed, the invention uses the machine that can be used to start the combustion engine.

Preferably, the electric machine is reversible so that, in addition to being able to start the combustion engine, be able to operate as an alternator driven by the combustion engine. In other words, the electric machine makes it possible to perform the Stop-Start function, to automatically restart the combustion engine at the end of an automatic stop phase, phase also called "Idling Stop" in English.

This automatic stopping phase corresponds for example to a stop at a red light, and the combustion engine is restarted when the driver presses the accelerator pedal. Thus in the automatic stop phase or "Idling Stop", the combustion engine is stopped, the reversible electric machine can operate the equipment that otherwise would also be stopped.

The invention is particularly advantageous for a truck or a bus.

When the machine operates as an alternator, this reversible machine produces electric current that charges a battery of the vehicle.

The invention makes it possible to dispense with the use of electrified and autonomous equipment.

The electric machine has in particular an electric power of between 4 and 25 KWatts, in particular between 6 and 12 KWatts, in particular a power substantially equal to 8 KWatts. This type of machine is for example a machine driven belt.

The electric machine is, if desired, configured to generate electric current during braking of the vehicle engine. This allows regenerative braking.

If necessary, the electric machine is configured to assist the combustion engine when the latter is in operation.

According to the invention, the equipment is configured to operate with the electric machine when the combustion engine is stopped. If the equipment is an air conditioning compressor, this allows the air conditioning of the cabin even during phases of automatic shutdown or "Idling Stop".

The equipment is for example a mechanical compressor, in particular an air conditioning compressor of the vehicle.

The equipment comprises a rotary member, in particular rotary shaft, this rotary member having an axis of rotation offset from the axis of rotation of the electric machine.

When the equipment is a compressor, the rotary shaft is operated for compressed air. Advantageously, the rotary member of the equipment is configured to be able selectively to:

- be decoupled in rotation from both the combustion engine and the electric machine so as to be at rest,

- be rotated by the combustion engine,

- be rotated by the electric machine.

Thanks to the invention, it is not necessary to have a motor dedicated to the compressor. This allows for a relatively simple architecture.

Preferably, the rotary member, in particular the rotary shaft, of the equipment is associated with a drive member, in particular a pulley, which is selectively coupled and decoupled with respect to the rotary member, so that that when the driving member is coupled with the rotary member, these two members rotate together, and when the drive member is decoupled from the rotary member, the drive member can rotate without causing the rotary member.

Advantageously the drive member of the equipment is rotated systematically when the electric machine rotates. In other words, the drive of the equipment can not be idle when the electric machine is running.

In an exemplary implementation of the invention, the equipment comprises a clutch, in particular an electromagnetic clutch, arranged to selectively couple and decouple the drive member and the rotary member of the equipment.

Preferably, the electrical machine comprises a first drive member associated with the internal combustion engine and a second drive member associated with the equipment, the two members being selectively rotationally fixed or rotatably detachable. Advantageously, the two drive members being interconnected by a clutch, in particular an electromagnetic clutch, arranged to selectively couple and decouple the two drive members.

In an exemplary implementation of the invention, at least one of the drive members comprises a pulley, in particular the two drive members each comprise a pulley.

The electric machine and the combustion engine are in particular coupled by a first transmission belt, which is in particular mounted on the first drive member.

The electrical machine and the equipment are in particular coupled by a second transmission belt, which is in particular mounted on the second drive member of the electric machine.

If necessary, it is possible to replace the drive belt by a contact between two meshing elements.

In an exemplary implementation of the invention, this second belt is mounted on the second drive member of the electric machine and on the drive member of the equipment so that these drive members are connected. constantly rotating.

The first and second transmission belts are distinct.

The equipment is advantageously arranged to operate solely with the help of the electric machine and the combustion engine, the equipment being in particular devoid of dedicated electric motor.

The combustion engine comprises a drive member, in particular a pulley cooperating with the first transmission belt.

Preferably, the system arranged so that, in a first mode of operation:

- The electromagnetic clutch is closed so that the two drive members are coupled in rotation - The combustion engine drives the two coupled drive members, the drive member of the electrical machine driving the equipment including via the drive member of the equipment. Thus the electric machine operates as an alternator and the compressor is in operation.

The system is arranged in such a way that, in a second mode of operation:

- The combustion engine is at a standstill, especially in an automatic shutdown phase,

- The electric machine operates as a motor, and the clutch between the two drive members of the machine is open, the two drive members being thus uncoupled,

- On the machine, the drive member drives the equipment, and the uncoupled drive member does not drive the combustion engine. Thus the compressor is in operation while the combustion engine is stopped.

The system is arranged in such a way that, in a third mode of operation:

- The combustion engine is in operation and drives the electric machine which acts alternator,

- The clutch on the electric machine is closed,

- The clutch on the equipment is open so that the drive on the equipment rotates without driving the rotating shaft of the equipment. Thus the compressor is stopped.

The system is optionally arranged to equip a truck or a bus.

The invention further relates to a method for mechanically operating a vehicle equipment with the aid of an electric machine configured to start an internal combustion engine of the vehicle. vehicle, this machine being further configured to mechanically operate the equipment.

The invention will be better understood and other details, characteristics and advantages of the invention will become apparent on reading the following description given by way of non-limiting example with reference to the accompanying drawings in which:

FIG. 1 is a schematic and partial view of a system according to an exemplary embodiment of the invention,

FIG. 2 is a block diagram illustrating various modes of operation of the system of FIG. 1, and

- Figures 3 to 5 show, schematically and partially, the system of Figure 1 respectively following different modes of operation.

FIG. 1 shows a system 1 for a motor vehicle, comprising:

an equipment of the motor vehicle 2, - an electric machine 3 configured to start an internal combustion engine 4 of the vehicle, this machine 3 being further configured to mechanically operate the equipment 2. The engine 4 comprises a rotary shaft 17, as visible in Figure 3. This tree is a crankshaft.

The machine 3 comprises a rotary shaft 18 integral with a rotor rotating within a stator.

The electric machine 3 is reversible so that, in addition to being able to start the combustion engine, it can operate as an alternator driven by the combustion engine 4. In other words, the Electric machine 3 allows the Stop-Start function, to automatically restart the combustion engine at the end of an automatic stop phase.

This automatic stopping phase corresponds for example to a stop at a red light, and the combustion engine is restarted when the driver presses the accelerator pedal.

The machine may be a synchronous rotating electrical machine with double excitation, that is to say comprising a rotor provided with permanent magnets and an excitation winding.

The invention is, in the example described, applied to a truck or a bus.

When the machine 3 operates as an alternator, this reversible machine produces electric current that charges a battery, not shown, of the vehicle.

The electric machine 3 has an electric power of between 4 and 25 KWatts, in particular a power substantially equal to 8 KWatts. This type of machine 3 is a machine driven belt.

The electric machine 3 is configured to generate electric current during braking of the vehicle engine. This allows regenerative braking.

The electric machine 3 is further configured to assist the combustion engine 4 when the latter is in operation. The machine 3 is, according to another name, an alternator-starter.

The machine 3 comprises a power electronics, an inverter, integrated.

In the example described, the equipment 2 is configured to be able to operate using the electric machine 3 when the combustion engine 4 is at a standstill. The equipment 2 is a mechanical air conditioning compressor of the vehicle.

The compressor 2 is used in a HVAC system of the motor vehicle.

The compressor 2 can be controlled electronically to compress or pressurize a refrigerant with the aid of one or more rotary pistons actuated by a rotary member 6 of the compressor 2, as can be seen in Figure 3 in particular.

The rotary member 6 is a rotary shaft, this rotary member having an axis of rotation X1 offset with respect to the axis of rotation X2 of the electric machine 3, these axes X1 and X2 being parallel and separated by a non-zero distance .

The rotary shaft 6 is operated for compressed air.

In the example described, the shaft 6 of the equipment 2 is configured to be able selectively:

- To be decoupled in rotation from both the combustion engine 4 and the electric machine 3 so as to be at rest,

- be rotated by the combustion engine 4,

- be rotated by the electric machine 3.

The rotary shaft 6 of the equipment 2 is associated with a drive member 8, a pulley, which is selectively coupled and decoupled with respect to the shaft 6, so that when the drive member 8 is coupled with the shaft 6, they rotate together, and when the drive member 8 is decoupled from the shaft 6, the drive member 8 can rotate without driving the shaft 6.

The pulley 8 of the equipment 2 is rotated systematically when the electric machine 3 rotates.

The equipment 2 comprises an electromagnetic clutch 9 arranged to selectively couple and decouple the pulley 8 and the shaft 6 of the equipment, as can be seen in FIG. The electric machine 3 comprises a first drive member 21 associated with the internal combustion engine 4 and a second drive member 22 associated with the equipment 2, the two members 21 and 22 being able to be selectively secured in rotation or disengaged in rotation. . These members 21 and 22 are rotatable both around the axis of rotation X2.

The two drive members 21 and 22 are interconnected by an electromagnetic clutch 25 arranged to selectively couple and decouple the two drive members 21 and 22.

The driving members 21 and 22 each comprise a pulley.

The pulley 22 is integral with the shaft 18 of the machine 3.

The electric machine 3 and the combustion engine 4 are coupled by a first transmission belt 31, which is mounted on the pulley 21.

The electric machine 3 and the equipment 2 are coupled by a second transmission belt 32, which is mounted on the pulley 22 of the electric machine 3.

The first and second transmission belts 31 and 32 are distinct.

The combustion engine 4 comprises a drive member 35, a pulley cooperating with the first transmission belt 31. This pulley 35 is integral with the shaft 17 of the engine 4, as illustrated in FIG.

Different modes of operation of the system 1 will now be described.

Depending on the activation of the air conditioning in the vehicle, illustrated by the control step 40 in Figure 2, different cases of operation occur.

When the command step 40 corresponds to a deactivation

(OFF) the air conditioning, ie the compressor 2 is at rest, the motor 4 and the machine 3 can operate without driving the compressor 2 (step 41 of Figure 2). This mode will be described in more detail with reference to FIG.

When the control 40 corresponds to an activation (ON) of the conditioned air, namely the compressor 2 is running, the motor 4 and the machine 3 can operate by mechanically driving the compressor 2. In one case (step 42), the combustion engine 4 is running, as better described with reference to Figure 3. In the other case (step 43), the internal combustion engine 4 is stopped, as described in more detail in Figure 4 .

In the operating mode corresponding to step 42, and with reference to FIG. 3, the system 1 operates as follows:

- The electromagnetic clutch 25 is closed so that the two drive members 21 and 22 are coupled in rotation.

- The combustion engine 4 drives the two drive members 21 and 22 coupled, the drive member 22 of the electric machine 3 driving the compressor 4 via the pulley 8 of the compressor 2, the clutch 9 being closed. Thus, the electric machine 3 operates as an alternator and the compressor 2 is in operation.

In the operating mode corresponding to step 43, and with reference to FIG. 4, system 1 operates as follows:

The combustion engine 4 is at a standstill, for example in an automatic stopping phase,

- The electric machine 3 operates in motor mode, and the clutch 25 between the two drive members 21 and 22 of the machine is open, the two drive members 21 and 22 thus being uncoupled, - On the machine 3, the drive member 22 drives the shaft 6 of the compressor 2 via the belt 32 and the clutch 9 closed, and the drive member 21 uncoupled does not involve the combustion engine 4 Thus the compressor 2 is in operation while the combustion engine 4 is at a standstill.

In the operating mode corresponding to step 41, and with reference to FIG. 5, system 1 operates as follows:

- The combustion engine 4 is in operation and drives the electric machine 3 which acts alternator,

- The clutch 25 on the electric machine is closed so that the pulley 21 rotates the pulley 22 in rotation, these pulleys 21 and 22 being secured by the clutch 25, - The clutch 9 on the compressor 2 is open so that the pulley 8 on the compressor 2 rotates without driving the rotary shaft 6 of the compressor. Thus the compressor 2 is stopped.

Claims

1. System (1) for a motor vehicle, this system comprising:

an equipment (2) of the motor vehicle, an electric machine (3) configured to provide torque to an internal combustion engine of the vehicle, in particular for starting the internal combustion engine (4) of the vehicle, this machine being further configured to mechanically operate the equipment.

2. System according to the preceding claim, the electric machine (3) being reversible so that, in addition to being able to provide a torque to the combustion engine, be able to operate as an alternator driven by the combustion engine.

3. System according to one of the preceding claims, the electric machine (3) having an electrical power between 4 and 25 KWatts, especially between 6 and 12 KWatts, including a power substantially equal to 8 KWatts.

4. System according to one of the preceding claims, the equipment (2) being configured to operate with the electric machine (3) when the combustion engine is stopped.

5. System according to one of the preceding claims, the equipment being a compressor (2) mechanical, including a conditioned air compressor of the vehicle.

6. System according to the preceding claim, the equipment comprising a rotary member (6), including rotary shaft, the rotary member having an axis of rotation (X1) offset from the axis of rotation (X2) of the electric machine.

7. System according to the preceding claim, the rotary member (6) of the equipment being configured to be able selectively:

- be rotated by the combustion engine,

- be rotated by the electric machine.

8. System according to the preceding claim the rotary member, in particular the rotary shaft (6), of the equipment is associated with a drive member, in particular a pulley, which is selectively coupled and decoupled with respect to the rotary member, so that when the driving member is coupled with the rotary member, these two members rotate together, and when the driving member (8) is decoupled from the rotary member, the driving member can rotate without driving the rotary member.

9. System according to one of the two preceding claims, the equipment comprising a clutch (9), in particular an electromagnetic clutch, arranged to selectively couple and uncouple the drive member and the rotary member of the equipment.

10. System according to one of the preceding claims, the electric machine comprising a first drive member (21) associated with the internal combustion engine and a second drive member (22) associated with the equipment, the two bodies being able to selectively secured in rotation or disengaged in rotation.

1 1. System according to the preceding claim, the two drive members (21, 22) being interconnected by a clutch (25), in particular an electromagnetic clutch, arranged to selectively couple and uncouple the two drive members.

12. System according to one of the two preceding claims, at least one of the drive members comprises a pulley, in particular the two drive members each comprise a pulley.

13. System according to one of the three preceding claims, the electric machine and the combustion engine being coupled by a first transmission belt (31), which is in particular mounted on the first drive member (21).

14. System according to one of the four preceding claims, the electrical machine and the equipment being coupled by a second transmission belt (32), which is in particular mounted on the second drive member (21) of the electric machine.

A method for mechanically operating a vehicle equipment with an electric machine configured to provide an internal combustion torque of the vehicle, the machine (3) being further configured to mechanically operate the equipment.