DE102020108060A1 - Method and device for starting an internal combustion engine by means of a belt drive with a belt starter generator in a vehicle - Google Patents

Abstract

The invention relates to a method for starting an internal combustion engine by means of a belt drive with a belt starter generator in a vehicle, in which the belt starter generator (2) is energized to drive a belt (3) of the belt drive (1) and a torque of the belt (3) is applied with the internal combustion engine (7) coupled crankshaft (10) is transmitted. In a method in which a reliable start of the internal combustion engine is possible in all situations despite the cost reduction, at least one parameter (P) of the belt starter generator (2) is set as a function of temperature to start the internal combustion engine (7).

Description

The invention relates to a method for starting an internal combustion engine by means of a belt drive with a belt starter generator in a vehicle, in which the belt starter generator is energized to drive a belt of the belt drive and a torque of the belt is transmitted to a crankshaft coupled to the internal combustion engine, as well as a device for Implementation of the procedure.

From the DE 10 2014 207 720 A1 a method for controlling a belt drive for an internal combustion engine is known, in which a pulley generator arranged in drive connection by means of a belt with a crankshaft of the internal combustion engine is controlled by means of a control device.

the DE 10 2018 132 398 A1 discloses a method for starting an internal combustion engine by means of a belt drive and / or a pinion starter when a belt starter generator is present in a motor vehicle. The belt starter generator is energized to generate a torque to start the internal combustion engine and the torque applied to a belt of the belt drive is transmitted via the belt to a crankshaft of the internal combustion engine. To start the internal combustion engine, the pinion starter meshes with a starter ring gear on the primary side of a dual-mass flywheel, causing the crankshaft to rotate. After the internal combustion engine has started, the pinion starter is switched off. On the opposite side of the crankshaft, a pulley decoupler of the belt drive is connected to the crankshaft.

The invention is based on the object of specifying a method and a device for starting an internal combustion engine with which a reliable start of the internal combustion engine is possible in all situations despite the cost reduction.

The object is achieved by the subject matter of claim 1.

In a method for starting an internal combustion engine by means of a belt drive with a belt starter generator in a vehicle, in which the belt starter generator is energized to drive a belt of the belt drive and a torque of the belt is transmitted to a crankshaft coupled to the internal combustion engine, to start the internal combustion engine at least a parameter of the belt starter generator set as a function of temperature. This has the advantage that a key start of the internal combustion engine, which in the following is to be understood as an initial start or a cold start of the internal combustion engine, can take place via the belt drive. There is therefore no need for a pinion starter. This reduces the installation space required by the internal combustion engine while at the same time saving weight. In addition to reducing costs, the bell housing and the ring gear of the dual-mass flywheel are simplified. The latter in particular because no power transmission via this is necessary. There is also potential for savings in electrical wiring.

In one embodiment, the at least one parameter of the belt starter generator is set as a function of a temperature of the internal combustion engine. This ensures that at any temperature of the internal combustion engine, a corresponding breakaway torque can be transmitted from the belt drive to the internal combustion engine in order to start it.

In a further embodiment, the at least one parameter of the belt starter generator is set as a function of a temperature of the internal combustion engine if a difference between the temperature of the internal combustion engine and an ambient temperature of the vehicle exceeds a predetermined difference threshold value. This condition can be easily detected using the software.

In a further embodiment, the at least one parameter of the belt starter generator is variably, preferably staggered, adapted as a function of the respective temperature of the internal combustion engine. Linear or non-linear relationships between the motor temperature and the ambient temperature can be taken into account.

In a further embodiment, if the internal combustion engine falls below a first predetermined temperature, the at least one parameter of the belt starter generator is increased or decreased, and if the internal combustion engine falls below a second predetermined temperature, which is lower than the first predetermined temperature, it is increased or decreased further. A staggered adjustment can thus be easily carried out.

In a further embodiment, the belt starter generator is activated in the form of a pulse. This is particularly advantageous at very low temperatures of the internal combustion engine, since the engine breakaway torque can be overcome quickly and a speed of the internal combustion engine can be built up.

In a further embodiment, the belt starter generator with an alternating Direction of current flow controlled. This ensures a reliable breakaway of the internal combustion engine and the build-up of its speed.

In a further embodiment, when the internal combustion engine is at a standstill, a predetermined torque is applied in a defined time manner to the belt drive, which torque is less than a torque required to start the internal combustion engine. This step can be carried out as an adjustment process before the internal combustion engine is actually started in order to ensure that the clearance angles of the various components of the belt drive are overcome. By overcoming this clearance angle, the entire belt drive is tensioned in such a way that a starting torque for the crankshaft of the internal combustion engine can always be applied under the same conditions.

In a further embodiment, a key start of the internal combustion engine is carried out during the temperature-dependent adaptation of the at least one parameter of the belt starter generator, while an automatic start-stop system is activated when the first predetermined temperature of the internal combustion engine is exceeded. The belt drive can thus be used for all starting situations of the internal combustion engine provided in the vehicle.

Another aspect of the invention relates to a device for starting an internal combustion engine in a vehicle, comprising a belt drive with a belt starter generator, which can be coupled to a crankshaft of the internal combustion engine via a belt, the belt starter generator having a control unit. In this device, the control unit is designed to carry out a method according to at least one feature described in this patent application.

The invention allows numerous embodiments. One of these will be explained in more detail with reference to the figures shown in the drawing.

• 1 ein Ausführungsbeispiel einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens,
• 2 ein Ausführungsbeispiel eines mit einem Verbrennungsmotor gekoppelten Riementriebes,
• 3 ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens.

Show it:

• 1 an embodiment of a device for performing the method according to the invention,
• 2 an embodiment of a belt drive coupled to an internal combustion engine,
• 3 an embodiment of the method according to the invention.

In 1 an embodiment of a device for performing the method according to the invention is shown. The device is a belt drive 1 formed and comprises a belt starter generator 2 . The belt starter generator 2 drives a belt 3 on, which is via a pulley decoupler 4th an auxiliary unit 5 drives. In the area of the belt starter generator 2 is the belt of a pendulum tensioner 6th surrounded which idler pulleys 8th has whose positions after a stop of the internal combustion engine 7th can be undefined. In addition to the position of the tension pulleys 8th are also clearance angles in which no torque is transmitted to the various components of the belt drive 1 undefined.

2 shows the connection of the belt drive 1 with the internal combustion engine 7th . The pulley decoupler 4th is with a crankshaft 10 coupled which in a dual mass flywheel 9 of the internal combustion engine 7th intervenes. As an auxiliary unit 5 an air conditioning compressor is used in the present case. Simultaneously be using a water pump 11 and an oil pump 12th even more ancillary units through the belt drive 1 driven.

For operating the internal combustion engine 7th includes the belt starter generator 2 a control unit 13th , via which the belt starter generator 2 is energized. The control unit 13th stands with a temperature sensor 14th for measuring the temperature of the internal combustion engine 7th and with an ambient temperature sensor 15th in connection ( 1 ).

An embodiment of the method according to the invention will now be based on 3 explained. In block 100 the method is initialized. It is then checked in block 110 whether the internal combustion engine 7th is switched off, that is, whether the speed n _{V of} the internal combustion engine 7th Is zero. If this is the case, an adjustment process takes place in block 120 JV on. With this adjustment procedure JV becomes the belt starter generator 2 Briefly energized in such a way that a torque is generated which is smaller than that for starting the internal combustion engine 7th required torque. This torque is applied to the belt drive 1 transferred, making the pendulum clamp 6th just like other components of the belt drive 1 take up a defined starting position, whereby the clearance angles of the components are overcome and the belt drive 1 is ready for use.

In the subsequent block 130 it is checked whether the temperature Tv of the internal combustion engine 7th is less than a first predetermined temperature T1 . As the first preset temperature T1 can do that from the ambient temperature sensor 15th measured outside temperature T _A of the vehicle. If it is determined in block 130 that the temperature Tv of the internal combustion engine 7th is greater than the first specified temperature T1 , an automatic start-stop system of the vehicle is activated in block 140. Otherwise, it is checked in block 150 whether the temperature Tv of the internal combustion engine 7th less than a second predetermined temperature T2 is which is below the first predetermined temperature T1 lies. If this is not the case, in block 160 parameters P. of the belt starter generator 2 depending on the temperature T1 set. To the variably adjusted parameters P. belongs to a speed of the belt starter generator 2 , which before a first injection into the internal combustion engine 7th is increased to, for example,> 400 rpm. A start gradient of the belt starter generator can also be used 2 reduced to 300 Nm / s or the maximum permissible torque increased

Is the temperature Tv of the internal combustion engine 7th less than the second specified temperature T2 , in block 170 the belt starter generator 2 driven in a pulsed manner, whereby a simultaneous change of the current direction can be carried out. Simultaneously or alternatively, the parameters P. of the belt starter generator 2 new to the specified temperature T2 customized. So can the speed of the belt starter generator 2 before the first injection can be increased further to, for example,> 600 rpm. The key start is then carried out in block 180.

In addition to changing the parameters of the belt starter generator 2 can also operate parameters of the internal combustion engine 7th depending on its engine temperature Tv can be varied. The injection speed, a throttle valve angle or a valve position of the internal combustion engine can be added to these parameters 7th belong to compression forces during the starting process of the internal combustion engine 7th lower. With these temperature-dependent set parameters P. the key start, ie an initial start or a cold start of the internal combustion engine is carried out (block 180).

After the key start has been released (block 180) or the automatic start-stop system has been released (block 140), a check is made in block 190 to determine whether the internal combustion engine is running 7th has started, ie its speed is n _v ≠ 0. Is the internal combustion engine 7th started, the program is ended (block 200). The combustion engine turns 7th not, a return is made to block 130.

List of reference symbols

1

Belt drive

2

Belt starter generator

3

belt

4th

Pulley decoupler

5

Auxiliary unit

6th

Pendulum clamp

7th

Internal combustion engine

8th

Tension pulleys

9

Dual mass flywheel

10

crankshaft

11

water pump

12th

Oil pump

13th

Control unit

14th

Temperature sensor

15th

Ambient temperature sensor

nv

Internal combustion engine speed

JV

Adjustment process

Tv

Internal combustion engine temperature

T1

first specified temperature

T2

second preset temperature

TA

Ambient temperature

P.

Belt starter generator parameters

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014207720 A1 [0002]
• DE 102018132398 A1 [0003]

Claims (10)

Method for starting an internal combustion engine by means of a belt drive with a belt starter generator in a vehicle, in which the belt starter generator (2) is energized to drive a belt (3) of the belt drive (1) and a torque of the belt (3) is set to one with the internal combustion engine ( 7) coupled crankshaft (10) is transmitted, characterized in that at least one parameter (P) of the belt starter generator (2) is set as a function of temperature to start the internal combustion engine (7). Procedure according to Claim 1 characterized in that the at least one parameter (P) of the belt starter generator (2) is set as a function of a temperature (Tv) of the internal combustion engine (7). Procedure according to Claim 2 , characterized in that the at least one parameter (P) of the belt starter generator (7) is set as a function of the temperature (Tv) of the internal combustion engine (7) when there is a difference between the temperature (Tv) of the internal combustion engine (7) and an ambient temperature (T _A ) of the vehicle exceeds a predetermined difference threshold value. Procedure according to Claim 1 or 2 , characterized in that the at least one parameter (P) of the belt starter generator (2) is variably, preferably staggered, adapted as a function of the respective temperature (Tv) of the internal combustion engine (7). Procedure according to Claim 4 , characterized in that when the internal combustion engine (7) falls below a first predetermined temperature (T1), the at least one parameter (P) of the belt starter generator (2) is increased or decreased and when the temperature falls below a second predetermined temperature (T2), which is lower than the first predetermined temperature (T1), is further increased or decreased. Method according to at least one of the preceding claims, characterized in that the belt starter generator (2) is activated in the form of a pulse. Method according to at least one of the preceding claims, characterized in that the belt starter generator (2) is controlled with an alternating current flow direction. Method according to at least one of the preceding claims, characterized in that when the internal combustion engine (7) is at a standstill, a predetermined torque is applied in a time-defined manner to the belt drive (1) which is less than a torque required to start the internal combustion engine (7). Method according to at least one of the preceding claims, characterized in that when the at least one parameter of the belt starter generator (2) is adjusted depending on the temperature, a key start of the internal combustion engine (7) is carried out, while when the first predetermined temperature (T1) of the internal combustion engine (7) is exceeded, a Automatic start-stop is activated. Device for starting an internal combustion engine in a vehicle, comprising a belt drive (3) with a belt starter generator (2) which can be coupled to a crankshaft (10) of the internal combustion engine (7) via a belt (3), the belt starter generator being controlled by a control unit ( 13) is controllable, characterized in that the control unit (13) is designed to carry out a method according to at least one of the preceding claims.

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