The invention relates to a start-up assistance system for a vehicle,
comprising at least one power switch, in particular semiconductor switch,
and a method for jump starting in a vehicle.
the breakdown statistics of the ADAC are batteries that are unwilling to start
all-winter in the first place. Almost 850,000 times had
the ADAC road watch driver jump-start last year
because of discharged or defective batteries - and that
not only in older cars. To be used in
usually relatively large and heavy starting aids,
which are equipped with a lead acid battery. For
a mobile application, these devices are therefore limited
suitable. Also, these types of jumpers can
usually not fast over the electrical system of a vehicle
In the prior art, for example, a portable multi-purpose starter from the DE 20 2007 004 272 U1
known. This has a housing for receiving a rechargeable battery, wherein in the housing electrical connection elements for connecting the battery are provided with provided in the housing electrical components.
From the DE 299 09 348 U1
is a portable battery energy storage with an integrated inverter and a grid-independent recharging, which can be recharged by means of solar and / or wind generators known.
The DE 199 51 094 C2
discloses a method and a device for securing a network containing a battery against reverse polarity, short circuit and / or overvoltage, wherein a reduced current flow detected by a Fremdstartstützpunkt to the battery and only in the case of compliance with predetermined limits, a direct connection of the Fremdstartstützpunktes to the battery and the electrical system is made.
The DE 100 49 321 A1
discloses a device for external power supply to a motor vehicle for powering electrical consumers that are connected internally to a power storage of a motor vehicle electrical system, wherein an inductive receiving device in the vehicle and an inductively from the outside inductively current coupling device are provided.
Another system to jump start is from the US 6,212,054 B1
known. This system can detect a wrong connection and thereby avoid the danger of battery exploding due to pole reversal. The system includes a switch that turns the power on and off. The system automatically detects a wrong polarity of the connected cables via its terminals and disconnects them from the power supply, if a wrong polarity is detected. Furthermore, the terminals are also de-energized when the cables are disconnected from them.
Starting process of a vehicle are currents of several hundred
Amperes required, for example, of over 1,000 A at
large diesel car and over 2,000 A in truck engines
and other big engines. Immediately at the start of the boot process
when the starter motor is stationary, the starter battery is almost in short circuit
operated and the battery current is essentially through the ohmic
Winding resistance is limited until the rotation of the starter
build up a counter tension. The thereby adjusting current amounts
about 30-50% of the peak current. Through the compression processes
In the internal combustion engine, large power fluctuations result.
Typically, a boot does not take more than three
Seconds. The required amount of charge is often around 1,000
As and the amount of energy depending on the voltage under 10,000 Ws. The
in the first 0.5 seconds, so at the beginning of the starting process required peak current
Often also from an aged battery or a
Battery to be delivered with very low capacity.
The then flowing for about 1 to 2 seconds
On the other hand, electricity can come from an aged or heavily discharged battery
no longer be delivered, especially not when the temperature
the battery and / or the engine is very low.
requested electric power of the starter is on the one hand of
the type of internal combustion engine, ie displacement, petrol / diesel engine,
etc., and on the other hand, the environmental conditions, such as the temperature,
the oil, the previous resting phase, etc., depending.
Furthermore, the electrical resistances
be taken into account between battery and starter terminals.
These explanations make it clear that when designing a starting aid or starting aid system it is not the energy content of the memory which is decisive, but its performance or its high-current behavior. For this reason, it has also been proposed to use instead of batteries as energy storage double-layer capacitors whose performance is very high for a few seconds, and their energy content is low, but still sufficient. A high performance also offers the possibility of bringing the memory back to a high state of charge within a few seconds, directly after the startup aid has been completed, in order to provide sufficient energy for subsequent starting processes To have available.
modern vehicles may have a lower limit voltage during
the starting process is not fallen below, so that the engine control yet
remains functional. The electrical system voltage must therefore also
during startup constantly above this
Limit value are. In addition, the battery is on some vehicles
already before starting for a few seconds a high
Power for some functions required for startup
taken, such. B. over 100 A for preheating
a diesel engine or about 50 A for the engine control unit
and other controllers.
is known that basically the maximum power,
which are discharged by batteries and double-layer capacitors
can, then is reached when the internal resistance and the load resistance
are the same size. Here, however, it should be noted that in particular
For batteries, the internal resistance depends on the current.
This means that the higher the current, the lower
will be the internal resistance. Furthermore, the internal resistance changes
during the boot process. The differences of internal resistance
are of the age of the battery and the meaning of diffusion and diffusion
Transport processes dependent. these can
significantly increase the internal resistance within one second.
In addition, the resistance of the starter (load resistance) is decisive
from the induced by induction counter tension of the starter motor
influenced, which in turn is speed-dependent. Furthermore
this is due to the fluctuating torque requirement of the internal combustion engine
influenced in the compression and expansion phases. It is
thus not possible, the battery during the
Starting operation always operate at the point of maximum power output.
It is also between the point of maximum power output
at the start of the boot process and during the boot process
Start of the starting process is the load resistance of the starter in
Standstill given by the ohmic resistance of the windings
and very low (in the range of about 2 milliohms to 5 milliohms). The
Battery is thus almost in short circuit at the start of the boot process
operated and the terminal voltage is well below the rated
or operating voltage.
the starting process is at the for the engine start
required speed of the starter produced by induction
Counter voltage converted into a current-dependent or
speed-dependent load resistance approx. 10 to 50 milliohms
(mΩ) and is thus much higher than at the beginning of the boot process.
The maximum power of the battery used could then
be removed when the internal resistance of the battery in the
each flowing currents the load resistance,
So the resistance of the starter during the startup corresponds.
The internal resistance of a conventional lead acid battery with
12 V nominal voltage is due to design and technology
the currents flowing during the starting process
but significantly lower, so the battery does not reach its maximum
Output power and significantly oversized for the boot process
and too heavy. The use of a smaller battery with higher
Internal resistance causes these to be in the range of their maximum
Power would be operated. It would sink then
but the voltage at the beginning of the starting process almost because of the short-circuit-like operation
to zero and the minimum voltage required for starting the engine
would not be respected. Besides that would be
during startup, the voltage at about 50% of
Output voltage. The lower voltage limit for the engine start
would then, if at all, only just exceeded.
Under these conditions is thus a respect. The maximum possible
Power output oversized battery the only one
Solution for the mentioned problem.
however, it would be desirable to have a lightweight portable
Provide start aid, which has a high starting current
for a few seconds,
the peak current required within the first 0.5 seconds
not fully deployed on a startup help system
must be, as an existing battery even in the aged state
and at low discharge briefly also a high current
can deliver. The possibility of direct reloading
the jump start memory after the jump start over
the electrical system of the motor vehicle would also be desirable,
the charging time should be low. Likewise, the levy would be
Maximum battery performance and optimal use
the output power desired.
The present invention is therefore based on the object, the above
solve problems and a start-up system
create a maximum power output of the battery or one
other energy storage allows this performance
can be used optimally, both via the electrical system
as well as being rechargeable via the supply network.
The problem is solved for a starting aid system according to the preamble of claim 1, characterized in that at least one internal starting assistance memory is provided with a predetermined nominal voltage, wherein the internal starting assistance memory for supporting in the power demand during the starting process to the starter battery is connected in parallel or connected. For a jump start procedure in a vehicle, the object is achieved in that when connecting one or the jump start system to the electrical system of a vehicle, the vehicle electrical system voltage is measured, a control logic of the starting assistance system is powered, the time is reduced to switch on the voltage of the auxiliary starting memory from the voltage measured during clamping vehicle electrical system voltage calculated by a voltage jump of n volts and the voltage supply is interrupted as soon as the vehicle electrical system voltage rises above a predetermined voltage. Further developments of the invention are defined in the dependent claims.
a start-up system is created in which by providing
the Starthilfespeichers parallel to the starter battery this at the
Performance request during a startup or during
the operationally necessary functions is supported. One
Discharge the booster battery and charging the starter battery
Start of the startup process is thus prevented.
the vehicle electrical system voltage several times during the starting process
below a predetermined or predetermined threshold, switches
the startup help system also several times on and off; so that always,
when the lower or upper threshold is reached, the power supply
or the startup support switched on or interrupted
becomes. An interruption of the power or voltage supply can
alternatively also be done after a predetermined period of time.
Rated voltage and / or operating voltage of the auxiliary starting memory can
the rated voltage and / or operating voltage of the onboard power supply battery
correspond. Alternatively, the voltage of the auxiliary starting memory
and the vehicle electrical system voltage of the vehicle be different levels.
For batteries z. B. a rated voltage of at least about 10th
V may be useful in double-layer capacitors
for example, three double-layer capacitors with a nominal voltage
be provided by about 2.5 to 2.7 V each. The advantage is the tension
to choose the boot-up memory with batteries so big that
the optimal charging voltage of the booster battery about twice as
high is like the vehicle electrical system voltage with the alternator running. To
Take into account that the memory is from a
Series connection of single cells with a defined internal resistance
is constructed. The goal should be to increase the number of cells so
choose that the internal resistances and the load resistance
have an equal value, so that a power adjustment with
maximum output power and minimum losses is achieved.
is a booster battery or a starting aid memory with higher
Rated voltage as now commonly used, so the required
Power to be provided with the smallest possible battery
can. The voltage limits during the boot process can thereby
nevertheless be respected. If z. B. a battery with 18 V operating voltage and
an internal resistance, which is the load resistance of the starter during
is equal to the startup used
Output voltage of the battery or the auxiliary starting memory during
booting about 9V and the boot process can be done easily
Jump start process is thus a jump start memory with unusual
Rated or operating voltage used, in particular a battery or
a double-layer capacitor, with a rated voltage of at least
about 10 V. The capacity of the booster battery can at least
be about 2 Ah, in particular 2 to 10 Ah, in particular 6 to
7 Ah. Also, a capacity of just under 2 Ah is basically
possible, but usually become capacity values
to be used by over 2 Ah. Will be a nickel metal hydride battery
For example, this may have a capacity of
about 6.5 Ah, while an internal resistance of about 1.3 to 1.6
mΩ per cell after a millisecond discharge in the range
of about 300 amps.
the internal resistance of the auxiliary starting memory is selected
or selectable that the internal resistance of the auxiliary starting memory
about the internal resistance of the starter in the operating state of a
Starts corresponds. The total voltage can be advantageous about
twice as high as a boot-up optimal
Be tension. Regardless of the rated voltage thus indicates
the startup memory one for a boot process required
Internal resistance area on and the electrical system of the vehicle, the
Jumpstart can be given before a rated voltage outside
of the permitted range.
the existing starter and vehicle power supply battery remains in the car,
Thus, two batteries with different voltage in parallel
connected. Therefore, a control device is advantageously provided,
the connection of the internal start-up memory of the jump start system
controlled on the electrical system, so that both batteries or memory,
the on-board battery and the starting aid memory, only at load time
operated in parallel. Problems due to the design of the batteries
or memory with different voltage can thereby
As an alternative to the method described above, the object can also be achieved by a method in which, with a favorable choice of the nominal voltage of the starting assistance memory, the control logic and the switch operated by it by a pas sive component, eg. As a diode to be replaced. Alternatively, thus, the function of the control logic and the switch operated by it by a passive semiconductor switch, for. As a diode to be replaced, which only becomes conductive when the voltage of the auxiliary starting memory is above the greatly reduced during startup voltage of the starter battery. If a passive component is provided instead of the control logic and of the switch actuated by this, this allows the flow of current from the starting aid memory to the starter after the vehicle electrical system voltage has fallen below the voltage of the auxiliary starting memory, and interrupts the current flow again, as soon as the vehicle electrical system voltage is higher.
furthermore, it proves to be advantageous, if between a starting aid memory
with an operating voltage below the usual vehicle electrical system voltage
in the idle state and the electrical system a diode is switched, the
then allows a flow of current from the starting aid memory,
if the vehicle electrical system voltage due to the voltage drop at start
falls below the voltage of the auxiliary starting memory.
Boot process via the external startup help system without one
built-in vehicle battery is usually not provided
because the vehicle after the end of the boot process and then running
Engine functional even after disconnecting the jump start system
should stay. This would be without a battery in the vehicle
not possible. Another requirement for performance and
However, voltage of the built-in system battery is not set up here.
in the event of a failure of the control logic and / or a circuit breaker
between starting aid system and electrical system this against too high a voltage
Protecting the boot memory is an advantage
Protective circuit provided. Advantageously, the protective circuit comprises
at least one resistor or diode across or
the starting aid memory from a predetermined voltage, the over
the expected during operation vehicle electrical system voltage and the consumer
of the on-board network is damaging voltage, is dischargeable or
unloaded. The protective circuit advantageously consists of a
Diode, so that when a voltage exceeded the impermissible
Current is shorted through this device. The protective circuit
is advantageously hard with the output terminals of the jump start system
connected, so is in any case active. It is advantageous when loading
Startup memory not engaged. If a permanent load
This protective circuit acting as a bypass is not possible
is advantageous, an acoustic warning message can be issued, the
to disconnect the jump start system prompts.
is at least one device for smoothing the voltage
with frequent switching operations by the control logic
provided, in particular with manual connection of the Starthilfespeichers. A
Such smoothing device can, for. B. a smoothing capacitor
Activation of the start-up assist system may occur upon detecting a load jump
done by a voltage jump. Therefore, one advantage
Device provided for detecting a load jump, which is advantageous
is included by the control logic and that of the before starting the boot process
measured on-board voltage, and switching on or Leitendmachen
a circuit breaker. This will make the booster battery
automatically connected via the circuit breaker and
disconnected, allowing a boot process through the boot memory
and a recharge of this by the on-board battery automatically
can be done. However, the booster battery can also be switched manually
be formed when a load jump can not be detected
or is and / or when the vehicle electrical system voltage is so low that
the starting process of the vehicle by its control units
is no longer useable. The jump start memory can in particular
be disconnected from the battery of the vehicle when the vehicle electrical system voltage over
rises a predefinable limit with the vehicle engine running.
Because at this time the terminals of the jump aid
have the same voltage as the electrical system battery, there at
Disconnect no sparking. Incidentally, also occurs at
Connecting the booster with the electrical system no sparking
on, because the terminals of the booster are de-energized.
Protection against reverse polarity is automatic by the control unit
ensured and the sequence when connecting and disconnecting is not
Advantageously, a circuit arrangement for directly charging the start-up memory, in particular two halves of the start-up auxiliary memory or the starting aid battery, provided via the electrical system. The Starthilfesystem can advantageously be connected directly to the starter battery of the vehicle for recharging, so that a recharge takes place via this. Advantageously, no discharge of the internal start-up memory of the start-up assistance system is provided at this time. This compensating currents can be avoided. The starting aid memory can advantageously be recharged via an external voltage source, which provides a voltage below (eg 6 V) and / or above (40 V) the nominal voltage. The charging power is advantageously designed so that in a short time, z. B. about a minute, the charge taken in the jump-start charge is loaded back into the starting aid memory, ie the charging current is z. B. a few 10 amps. In particular, two halves of Starthilfespeichers can be connected to each other via at least one switch and with the electrical system battery via additional switches. The one switch can be identical to the circuit breaker of the start assist system, via which the control logic can be switched on.
can advantageously at least one device for evaluating the data
be provided the start-up assistance system for assessing the electrical system battery. about
Such an evaluation device can be fast and easy
also be determined whether possibly damaged the electrical system battery
is and needs to be replaced if necessary. Such a data logger is
advantageous as an independent unit of the jump start system
trained to be able to evaluate data and also after
the startup process and disconnecting the Starthilfesystems more data
to be able to record. With a connected jump start system
If necessary, a bonnet of a vehicle can no longer be closed
why, to drive the vehicle into a workshop or
should be removed to another place the startup help system.
The datalogger measures the voltage of the electrical system and saves
these with a high temporal resolution, such. B. 1
kHz. It can be switched on manually and starts either by
another manual intervention to save the data or he
Storage starts as soon as the voltage increases by more than one
predefinable value changes, such. B. 0.5 V at power
of control units. For this is a corresponding query
and evaluation of the voltage values provided.
furthermore, it proves to be advantageous that the starting aid system is modular
is constructed. This allows the integrated start help memory ever
be customized according to vehicle type. The remaining components
the start-up system, however, can be independent
from the jump start memory in all embodiments
used by start-up assistance systems.
In terms of
the construction of the jump start system, it proves to be advantageous
its housing so that it looks like a
Cover, which is in particular form-adapted, over the
weak on-board battery can be placed. In case of an explosion
then there would be a protection against splinters.
closer explanation of the invention will be hereinafter
an embodiment of this with reference to the drawings
described in more detail. These show in:
1 a diagram with internal resistances of different NiMH modules with 6 cells at different current amplitudes,
2 a schematic representation of the structure and the coupling of a starting aid according to the invention to a vehicle electrical system,
3 a diagram showing the voltage curve during a start operation (low battery) with indicated switching thresholds (U1, U2) of the start assist system,
4a . 4b a schematic representation of a direct charge circuit for recharging the booster battery, wherein the state of the circuit breaker between the on-board battery and the two halves of the booster battery during the starting process ( 4a ) and during recharging ( 4b ) are shown.
1 shows a diagram showing the internal resistances of various nickel-metal hydride modules with six cells at different current amplitudes. Values up to approx. 200 A represent the usual field of application for modules of hybrid vehicle applications. The six cells of the nickel-metal hydride modules have a nominal voltage of 7.2 V in the example shown.
Of the 1 It can further be seen that nickel-metal hydride modules or batteries with a capacity of about 6.5 Ah in the range of about 300 A have an internal resistance of about 1.3-1.6 mΩ per cell after a millisecond discharge. After one second, the value increases to approx. 2 to 2.3 mΩ per cell.
fifteen series-connected cells with a nominal voltage
of 18 V and an operating voltage of approx. 20 V in the complete
charged state, these then have approximately an internal resistance,
the load resistance of the starter, terminals, wiring
etc. during startup. The batteries
be under these conditions in the starting process with their maximum
Power operated. At rest of the starter is the resistance
the armature, however, much lower than the internal resistance of the battery.
The battery is therefore almost always operated in short-circuit when switched on.
The current is much higher than in other operating states.
The tension sinks, but should continue over
remain at the lower limit voltage for the starting process.
This is done by switching many cells of the battery in series
as well as the starter battery of the electrical system allows. These
Although it can not deliver the required performance anymore
but also to ensure that the vehicle electrical system voltage does not collapse.
2 shows schematically the structure of a starting aid system according to the invention 10 connected to an electrical system 11 a motor vehicle, including, inter alia, a starter, and a starter battery 12 is is closed. The startup help system 10 includes a control logic 1 and an internal start help memory 2 z. B. with a rated voltage above 12 V, which is connected in parallel to the starter battery to assist in the power request during the boot process. The switch-on and switch-off thresholds or criteria for the internal start help memory can be specified exactly to the control logic, so that the switching thresholds for the memory technology used can be adjusted accordingly. The switching thresholds are dynamically changeable by the logic unit or control logic depending on the terminal voltage of the electrical system. A schematic representation of the voltage curve during a start process of a weak battery is together with the thresholds U1 and U2 of the start assist system in 3 to see.
As 2 can be taken further, the control logic 1 from the start help memory 2 powered. Therefore, the control logic 1 with a switch or circuit breaker 7 to manually disconnect the control logic from the startup help memory 2 so that the starting aid memory in the form of a battery is not discharged at a standstill.
To charge the startup memory is an external or internal charger 3 provided and with the jump start memory 2 connected. Furthermore, the start-up assistance system includes a data logger 4 which is integrated between the starter battery and the control logic. This data logger can be designed as a separate unit that can be separated from the other components of the startup assistance system. About this datalogger 4 Current, voltage and possibly temperature values can be recorded and stored with high temporal resolution, eg. B. with a resolution of 1 kHz.
The in the datalogger 4 stored data can be read, for example via a USB port. An evaluation can take place via a normal PC, which however in 2 not shown.
The jump start system points accordingly 2 Furthermore, a 12 V Bordnetzersätzeinrichtung 6 on. However, this is not essential. However, if the onboard power supply battery has such a low voltage that not even the engine startup control units can be switched on, the 12 V onboard power supply unit can generate a required vehicle electrical system voltage in the permissible range instead of or in addition to the starting aid memory. The onboard power supply unit 6 can via a switch 8th with the electrical system 11 get connected.
The internal start help memory 2 indicates a different terminal voltage than the starter battery 12 on. For batteries as starting aid storage, the voltage will be above the vehicle electrical system voltage, so that they can be operated in the range of their maximum power. For double-layer capacitors (DSC) as start-up memory, a lower voltage can be used to minimize the cost of the double-layer capacitors. In the case of double-layer capacitors, a voltage which is significantly above the maximum permissible vehicle electrical system voltage is usually not possible, since double-layer capacitors initially show only a small voltage dip in the short circuit. For example, six double-layer capacitors are realized with a charging voltage of 2.7 V per cell, since their maximum voltage of 16.2 V at the start of the starting process will drop below 16 V, provided that such a voltage is permissible for the particular application. Additional rated voltages of double-layer capacitors are normally not possible with a 12 V electrical system.
The jump start memory 2 normally has a significantly higher rated voltage than the vehicle electrical system. With a 12 V electrical system, the voltage of the auxiliary starting memory becomes 2 in the range of about 20V to about 26V. 20 V are provided by z. B. 15 cells with a rest voltage of about 1.32 V / cell, whereas 26 V by z. B. 18 cells can be realized with a voltage of about 1.45 V / cell, measured a short time after disconnecting from the Ladeerhaltungsspannung. For 24 V on-board systems, the values are twice as high, that is, at about 40 V to about 52 V.
In case of failure of the control logic 1 the electrical system 11 To protect against excessive voltages, a protective circuit is provided (in 2 not to be seen), which is from a predetermined voltage, which is above the expected during operation vehicle electrical system voltage and under the load of the electrical system voltage, z. B. a voltage of about 15 V, the start-up memory, z. As a battery, discharges through a resistor. Here can z. B. a zener diode may be provided, which becomes conductive from a certain voltage.
As already mentioned above, the provision of a device for reloading the Starthilfespeichers makes sense. Such a device may be a DC / DC converter, which uses the voltage of the electrical system, as soon as the electrical system has a voltage above about 13V. Another possibility is to provide as a device the cigarette lighter of a vehicle and a DC / DC converter or a 240 V socket, a plug-in power supply or a conventional charger can be used. The control logic monitors the charging process and releases the DC / DC converter. An overload of memory is also prevented by the control logic.
Alternatively or additionally, with an appropriate choice of the nominal voltage of the auxiliary starting memory 2 the store also directly through the electrical system battery 16 done as in 4a and 4b outlined. Here is a circuit breaker between the two halves of Starthilfespeichers 13 inserted. This is at startup to connect the two halves 20 . 21 the booster battery or the memory is closed ( 4a ) and will be opened for reloading ( 4b ). The function corresponds to the switch 13 the switch 7 , About two more circuit breakers 14 . 15 are the two halves 20 . 21 the jump start memory 2 connected to the electrical system battery at both ends or poles. The two circuit breakers 14 . 15 are opened at startup and closed for reloading. Immediately after the end of the starting process, the vehicle electrical system voltage rises very quickly to over 13 V, so that then the booster battery can be charged.
The charging voltage of a NiMH battery is z. B. in the range of 1.4 to 1.6 V, ie in a nine-cell battery part with a rated voltage of 10.8 V at a vehicle electrical system voltage between 12.6 and 14.4 V. The advantage of 4 sketched charging circuit is that this does not require a DC / DC converter and thus is easier and cheaper. The recharging of the auxiliary starting memory takes place immediately after the end of the starting process until the starting aid system is disconnected. The charging circuit also has the advantage that standard chargers can be used for 12 V vehicle electrical systems.
It is also advantageous to measure the current of the auxiliary starting memory by the voltage drop across the circuit breakers 7 or 13 possible, so that without additional components of the datalogger can detect the power of the booster, and / or the battery current through a clamp meter. Advantageously, the determination of the charging and discharging current is possible here in order to enable a monitoring of the state of charge, which is calculated via the current integral.
In order to generate the at least required on-board network voltage for initiating the starting process, the starting aid memory can be used. With a correspondingly high switching frequency with which the voltage of the auxiliary starting memory is switched on and off on a smoothing capacitor, the smoothing capacitor can be applied to a voltage required for the initiation of the starting process, for. B. 10 V charged. The voltage will fluctuate relatively high for small and inexpensive capacitors. It can therefore also a small spare battery, namely the onboard power supply 6 , are used when the engine control units are not operating properly with such high and large voltage fluctuations, even if they are within the allowable voltage range. This replacement battery is able for a short time, z. B. 10 seconds to deliver a sufficiently high current, for. B. a current of about 50 amps, without the vehicle electrical system voltage drops below the voltage at which the controller turns off. 10 2.5 Ah high-rate NiCd or NiMH cells connected in series or a 12 V lead-acid battery in the capacity range of approx. 2-6 Ah or a small lithium battery (3 cells) are already sufficient for this purpose.
the voltage curve of the electrical system during and after
The boot process can already without current measurement, but better with
Current measurement, to be closed on the condition of the electrical system battery.
When the voltage of the alternator to the set voltage value
of the electrical system increases, then it is assumed that the cargo capacity
the battery is low and it is sulphated. She is then in
a worse condition than a battery that contributes a high charge current
draws less tension. From the voltage noise of the battery,
caused by load fluctuations of the vehicle, can over it
In addition, the internal resistance can be estimated. A
Damaged battery has a much higher
Internal resistance as a very deep discharged battery. Using
a clamp meter, as already mentioned above
is, the corresponding evaluations are more accurate.
The procedure for starting and reloading startup memory will now be described below. When starting the jump start system, the control logic is initially applied to the on-board network of a vehicle for the jump start procedure 1 supplied with power from the weak starter battery and measured the vehicle electrical system voltage. If the vehicle electrical system battery has too low a voltage or load capacity, then the power is supplied via the on-board power supply battery or the smoothing capacitor charged via the starting auxiliary storage. Here, a manual switch is provided. The control logic calculates the voltage to be supplied from the electrical system voltage measured during clamping reduced by a voltage jump of n volts, z. B. 2 volts. Such a voltage jump or break is associated with a high current load of the electrical system battery, as it exists during the starting process. The voltage supply is interrupted, so the start assist system off as soon as the voltage is above a voltage U2 z. B. of about 13 V, but at the latest after a predetermined time, such. For example 5 seconds. The respective switching thresholds can be specified by the manufacturer, as well as the time values. Advantageously, the voltage and time values can not be changed by the user, thus no damage to the on-board network of the vehicle due to an incorrect setting of the values occur. Basically, however, a user-side adjustability of the voltage and time values can be provided. Possible here is z. B. a dynamic specification of the threshold and time values depending on the height of the vehicle electrical system voltage. With a high terminal voltage can be assumed that a functional battery with a high state of charge, so that an intensive support, combined with a long duty cycle, is not required. With low vehicle electrical system voltage can be assumed that a non-bootable starter battery, so that the duty cycle is to extend.
At very low voltage, which is for example at about 0-6 volts, u. U. no load jump will be detected more or the engine control units will not start the boot process. Then the switch 7 be manually operated, so that the starting aid memory 2 is switched to the electrical system. The vehicle electrical system voltage then rises immediately and the switch 7 is about the control logic 1 operated so that the vehicle electrical system voltage remains in a likewise predeterminable voltage range, for example, a range between about 8 V and about 12 V. It may also prove useful to use a small capacitor via the terminals of the auxiliary starting memory 2 so that the voltage does not switch between the two limits so quickly.
The circuit breaker 7 should conduct high currents loss, which is why the use z. B. a MOSFET proves to be suitable. Losses when switching on and off can usually be neglected. Because of the maximum low duty cycle of z. B. 5 seconds no special cooling is needed. Advantageously, the mounting of the switching elements directly on the housing in order to derive the power loss in the form of heat directly to the outside. In principle, of course, a cooling can be provided, if this is application-specific desired or should prove to be advantageous. A particularly favorable structure results in the provision of a parallel connection of MOSFETs, since then modules can be constructed with a maximum current of well over 1000 A by simply connecting several MOSFETs in parallel using a driver.
Jump start with 24 V electrical systems would be the examples
for a 12 V electrical system voltage levels to double.
However, the mentioned exemplary time values can be used
stay the same as above.
If the start assist system is placed on the battery to be started, z. B. with a shape-matched housing, it is possible the cables used 5 for the connection of the jump start system to the electrical system and the starter battery or electrical system battery very short interpreted, z. B. to be provided with a length of about 30 cm. As a result, cables can advantageously be saved and inductive overvoltages, which can have a negative effect on the electrical system, be avoided. Due to the small length, the cables can be relatively thin.
the embodiments mentioned above and shown in the figures
start-up systems and jump-start procedures
still numerous further are formed, with which in each case at least
a circuit breaker, in particular semiconductor switch and at least
an internal start help memory are provided, the start help memory
is switched parallel to the starter battery of the vehicle or
can be switched. In particular, the nominal voltage or
Operating voltage of the auxiliary starting memory higher than usual
and differs in particular from the vehicle electrical system voltage. About that
In addition, applications are possible in which the one described here
Jump Start System can completely replace a starter battery,
z. B. in vehicles, where in addition to a board battery in addition
a starter battery used only for starting
used, or in emergency power systems. Especially for hybrid vehicles,
where a traction battery and a starter battery provided
can be waived on the second. A DC / DC converter
ensures in this case for the stabilization of the low-voltage electrical system
and the starting process of the internal combustion engine is used
a modified version of the start assist system presented here
- control logic
- Jumpstart memory
or internal charger
- data logger
- electric wire
for connection to batteries
- Emergency mooring facility
- Boot Helper
- board network
- starter battery
- System battery
QUOTES INCLUDE IN THE DESCRIPTION
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Cited patent literature
- - DE 202007004272 U1 
- - DE 29909348 U1 
- - DE 19951094 C2 
- - DE 10049321 A1 
- - US 6212054 B1