DE202010017999U1 - An engine power request grip assembly and a motor power request grip control circuit - Google Patents

Abstract

An assembly of a motor power request handle (2) and a control circuit (44) for the engine power request handle (2) of a vehicle, wherein the motor power request handle (2) comprises a potentiometer (27), wherein the potentiometer (27) comprises a resistor (28), a grinder and three terminals (271, 272, 273), wherein the first terminal (271) is connected to the wiper and the second terminal (272) is connected to a first end of the resistor (28) of the potentiometer (27) and third terminal (273) are connected to a second end of the resistor (28) of the potentiometer (27), wherein the control circuit (44) has a first terminal (41) and a second terminal (42), wherein the first terminal (41) of the control circuit (44) via a first line (51) to the first terminal (271) of the potentiometer and the second terminal (42) of the control circuit (44) via a second line (52) with the second terminal (272) of the potentiometer (27) verbu nden, and in the control circuit (44) is a first measuring circuit, which determines by means of a potential at the first terminal (41) of the control circuit (44) the value for the motor power desired by the driver, characterized by a second measuring circuit for measuring the potential at the second terminal of the control circuit (44).

Description

The invention relates to an assembly of a motor power request handle and a control circuit for the engine power request handle, in particular for light vehicles with electric drive. Light motor vehicles can be designed as two-wheelers or as mopeds or motorcycles. The speed is controlled by means of an engine power request handle, which is also called a gas grip in gasoline-powered vehicles and which is arranged on a handlebar of the vehicle. In light motorcycles, which are powered by gasoline, the throttle grip is usually via a cable or a return spring with a throttle valve and a throttle valve of the engine in conjunction.

In particular, in electric vehicles, the position of the engine power request handle or throttle grip is electronically queried. For this purpose, the throttle grip on a potentiometer whose resistance value is read on the wiper of the potentiometer of a controller. This read signal is used to control the motor. The DE 20 2006 013 141 U1 shows such an arrangement. However, there is a risk that when read errors of the engine further accelerated, although the driver actually wants to brake and indicates this with the help of the engine power request handle, and even reacts hectically, which endangers the traffic.

It is an object to provide an assembly of a motor power request handle and associated control circuitry that enhances the safety of the light motor vehicle.

This object is solved by the subject matter of the independent claims. Advantageous embodiments emerge from the respective subclaims.

An assembly of an engine power request handle and a control circuit for that engine power request handle for a vehicle is provided. The motor power request handle has a potentiometer with a resistor, a grinder, and three terminals. The first terminal of the potentiometer is connected to the wiper and the second terminal and third terminal are respectively provided at one of the two ends of the resistor of the potentiometer.

The control circuit has a first terminal, a second terminal and a third terminal. The first terminal of the control circuit is connected via a first line to the first terminal of the potentiometer, the second terminal of the control circuit is connected via a second line to the second terminal of the potentiometer and the third terminal of the control circuit is connected via a third line to the third terminal of the potentiometer connected.

In the control circuit, a first measuring circuit is provided, which determines the value for the motor power desired by the driver based on the electrical potential at the first terminal of the control circuit. In addition, a second measuring circuit for measuring the potential at the second terminal of the control circuit is provided. With the help of the second measuring circuit, it is possible to constantly check whether the module is still functioning.

There is a risk that, in the case of corrosion of the line between the second terminal of the control circuit and the second terminal of the potentiometer, the line becomes high-impedance. Also, this line can break. This line is usually long, since the engine power request handle on the handlebar and the control device in a central location on the vehicle, for example in the vicinity of the bottom bracket is. If the case of increased line resistance of the line described above occurs, little or no current flows through the line, resulting in measurement errors. With the help of the second measuring circuit, this is detected and can be intervened in the engine control accordingly.

Preferably, a third measuring circuit is also provided, which measures the potential at a third terminal of the control circuit. This also breaks or corrosion of the third line can be detected.

Particularly suitable is the assembly when the potentiometer is connected in series with two resistors which are part of the control circuit, this potentiometer being provided between the resistors. In this way, line breaks of the two supply lines to the potentiometer can be detected, because a line break leads to a change in the potential at one terminal of the control circuit.

Preferably, the first measuring circuit includes an analog-to-digital converter. With the help of digital signal processing usually more complex control operations can be performed than with an analog circuit.

In one embodiment, an evaluation circuit is provided for receiving an output signal from the second measuring circuit and for generating a switch-off signal for an electric motor of the vehicle when the potential at the second terminal of the control circuit either falls below a predetermined threshold or exceeds. If, for example, the second connection is connected to a high supply potential via a resistor in the control device, exceeding a predetermined potential near the high supply potential indicates a defect of the line to the second terminal of the potentiometer. Conversely, if the second terminal connected via a resistor in the control device with a low supply potential, falls below a switching threshold, which is slightly above the low supply potential, that the line is broken to the second terminal of the potentiometer, for example.

In a further embodiment, the evaluation circuit is furthermore provided for receiving an output signal from the third measuring circuit. In addition, it is for generating a switch-off signal for an electric motor of the vehicle when the potential at the third terminal of the control circuit either falls below or exceeds a further predetermined threshold value. With the evaluation circuit, it is possible to centrally control the switching off of the electric motor in the event of a fault.

The switching off of the electric motor can be done indirectly by, for example, to the evaluation of the engine control unit outputs a signal according to which one of the lines is defective, whereupon the engine control switches off the electric motor or sets its speed to zero.

Further check for malfunction is enabled with a resistance between the first terminal of the control circuit and a node which is at a fixed potential. With this resistor, the potential at the first terminal of the control circuit is pulled to the fixed potential when the first line becomes high-impedance. This can be detected by the first measuring circuit, so that subsequently the evaluation circuit switches off the electric motor.

The application also relates to a vehicle having an electric motor and an imagined module, the value measured by the first measuring circuit being used as a reference variable for the rotational speed of the electric motor.

The application also relates to a control circuit for a motor power request handle of a vehicle, the motor power request handle having a potentiometer with a wiper and a resistor. The control circuit has a first terminal and a second terminal. The first terminal of the control circuit is designed for connection via a first line with the wiper of the potentiometer of a motor power request handle and the second terminal of the control circuit is designed for connection via a second line to one end of the resistor of the potentiometer.

In the control circuit, a first measuring circuit, which determines the value for the motor power desired by the driver by means of a potential at the first terminal of the control circuit and generates therefrom an output signal as a reference variable for the rotational speed of an electric motor.

A second measuring circuit is provided for measuring the potential at the second terminal of the control circuit for generating a switch-off signal for the electric motor of the vehicle when the potential at the second terminal of the control circuit either falls below or exceeds a predetermined threshold value. With the help of the second measuring circuit, fractions of the second line can be detected.

In one embodiment, the control circuit has a resistor between a supply terminal for a supply voltage and the second terminal of the control circuit.

In a further embodiment, the control circuit has a third connection for connection via a third line to a further end of the resistance of the potentiometer. A third measuring circuit is provided for measuring the potential at the third terminal of the control circuit.

Furthermore, the control circuit may have a resistance between a supply terminal for a supply voltage and the third terminal of the control circuit.

The application also relates to a method for controlling the assembly. In this method, it is detected whether the potential at the second measuring circuit exceeds a value. In this case, a signal for issuing the electric motor is generated by the control circuit.

Preferably, if the potential at the third terminal of the control circuit exceeds a value, the control circuit generates a signal for issuing the electric motor.

The invention will now be explained in more detail with reference to an embodiment which is illustrated with the aid of the figures.

1 shows an assembly for specifying the desired engine performance of a vehicle;

2 shows an electrical circuit in the device 1 is provided;

3 shows a flowchart of the method according to the invention;

4 shows a vehicle with integrated assembly of throttle grip and control circuit.

1 shows an assembly for specifying the engine power of an engine of a vehicle. The assembly 1 contains as a motor power request handle a throttle grip 2 , which is attached to the handlebar of the vehicle. The throttle grip 2 includes a movable part relative to the handlebar 20 and a stationary part relative to the handlebar 21 , By turning the movable part 20 opposite the immovable part 21 becomes a potentiometer 27 located inside the throttle grip 2 is located, adjusted.

The potentiometer 27 has a first connection 271 , a second connection 272 and a third connection 273 on. These connections 271 . 272 and 273 are each provided for connecting an electrical line. The assembly 1 also contains a circuit board 4 on which a control circuit 44 is integrated. This control circuit 44 contains a first connection 41 , a second connection 42 and a third connection 43 , The first connection 41 the control circuit is via a first line 51 with the first connection 271 of the potentiometer 27 , the second connection 42 the control circuit 44 with the second connection 272 of the potentiometer 27 and the third connection 43 with the third connection 273 of the potentiometer 27 connected.

The potentiometer 27 inside the moving part 27 has a resistor, a grinder and three connections. The first connection 271 of the potentiometer 27 is connected to the grinder, the second connection 272 of the potentiometer 27 is with a first end of the resistor of the potentiometer 27 and the third connection 273 of the potentiometer 27 is connected to a second end of the resistor of the potentiometer 27 connected.

2 shows in a schematic diagram of the circuit by means of the control circuit 44 and the electrical components of the engine power request handle 2 is realized. The circuit includes a series connection of a first resistor 46 , the potentiometer 27 and a second resistor 49 , This series connection is fed from a supply voltage of 5 V in such a way that the connection for the higher potential 48 with a first terminal of the first resistor 46 whose second connection is connected to the second connection 272 of the potentiometer 27 connected is. The third connection 273 of the potentiometer is connected to a first terminal of the second resistor 49 connected, whose second connection to the ground connection 47 connected is. The first resistance 46 and the second resistance 49 each have an amount of 420 ohms.

The circuit also has a first analog-to-digital converter 441 , a second analog-to-digital converter 442 and a third analog-to-digital converter 443 on. The potentiometer 27 is about his second connection 272 over the second line 52 and over the second port 42 the control circuit 44 with an input of the analog-to-digital converter 442 connected. The first connection 271 of the potentiometer 27 is over the line 51 with the first connection 41 the control circuit 44 connected in turn to the input of the analog-to-digital converter 441 connected is. The third connection 273 of the potentiometer 27 is over the line 53 and over the third port 43 the control circuit 44 with the input of the analog-to-digital converter 443 connected. The output of the analog-to-digital converter 441 is with an input of an engine control unit 60 and the output of the analog-to-digital converter 442 and 443 are each with one of the inputs of an evaluation circuit 55 connected.

The circuit also has a resistor 71 on that between the connection 41 the control circuit 44 and the crowd 47 is provided.

The potentiometer 27 is in the throttle grip 2 integrated, the electric motor 61 is located near the bottom bracket and the other components shown, especially the resistors 46 and 49 , the analog-to-digital converter 441 . 442 and 443 , the engine control unit 60 and the evaluation unit 55 , located on the board 4 , The wires 51 . 52 53 run, as mentioned above, between the throttle grip 2 and the control circuit 44 ,

With the help of the first analog-to-digital converter 441 it is measured how high the potential is on the grinder. This measurement gives a measure of how far the potentiometer 27 with the help of the moving part 20 in one direction or the other. The reading is in the analog-to-digital converter 441 converted to a digital value and for the engine control unit 60 as a reference variable for the electric motor 61 used. Thus, with the help of the moving part 20 given, with which speed the electric motor 61 to turn.

The resistors 46 and 49 , each with a value of 420 Ω, ensure that the voltage at the wiper remains within a certain range. However, it may happen that in the robust environment of the vehicle, for example, the line 53 breaks or is damaged by corrosion, bringing the resistance of the line 53 rises sharply. In this case, the analog-to-digital converter measures 441 a voltage value that does not correspond to the value desired by the driver. Is z. B. the line 53 broken, the potential at the slider is forcibly pulled to the potential 5 V, regardless of the position of the movable part 20 in relation to the immovable part 21 , The control circuit 44 normally interprets the high potential at the terminal 43 as a requirement of the driver, the electric motor 61 operate at the maximum speed and controls the electric motor 61 with the help of the engine control unit 60 accordingly.

With the help of analog-to-digital converters 442 and 443 and the subsequent evaluation circuit 55 it is determined if the lines 52 and 53 are broken. For example, is the line 53 broken, so detects the analog-to-digital converter 443 a potential of 0 V and the analog-to-digital converter 442 a potential of 5 V. On the other hand is the line 52 broken, the analog-to-digital converter detects 442 an electrical potential of 5 V. The voltages refer to the ground potential. If the potential at the connection 42 near 5 V or the voltage is at the terminal 43 near 0 V, it can be assumed that at least one of the lines 52 and 53 strongly high impedance or completely broken. Thus, it can be assumed that the signal at the port 41 is faulty. Accordingly, the evaluation circuit 55 a corresponding error signal to the engine control unit 60 then the normal control of the electric motor 61 interrupts. The engine control unit 60 then switches the electric motor 61 out.

3 shows a simplified flowchart for illustrating the method according to the invention for driving the electric motor 61 , After a start 300 the procedure goes to the step 301 in which the voltage at the terminal 42 is measured. If this voltage is greater than 4.7V, it branches to the step 304 , If the voltage is not greater than 4.7 V, the procedure goes to step 302 continued. In this step 302 It checks if the voltage at the connection 43 is less than 0.3V. If this question is answered in the affirmative, the method goes to the step 304 continued. Otherwise, the next step is 303 perform. In step 303 will the voltage at the terminal 41 measured and depending on this voltage, the speed of the motor r _M set. In step 304 the speed of the motor is set to zero. Due to the obvious malfunction will step in 304 the engine switched off. Additionally, in the step 304 the driver is informed by means of a display that there is a defect on the throttle grip.

After starting the vehicle is queried by the controller, whether by the throttle grip 2 no request for torque is transmitted. Only when the throttle grip indicates no torque request for at least a short period of time does the throttle twist grip become active 2 displayed value used to the speed of the electric motor 61 to control.

This prevents the following hazard scenario: A two-wheeler leaning against a wall with the throttle twist grip clamped in a middle position. The vehicle is switched off. When the vehicle's electrical power is turned on, the engine controller receives 60 from the potentiometer 27 a signal that an average torque is requested. The two-wheeler would shoot forward. By checking whether the torque request is zero, at least in the short term, it is prevented that an initially clamping gas grip is misunderstood as a driver demand torque.

The resistance 71 , which is designed high impedance compared to the resistance of the potentiometer, ensures that even a break in the line 51 or a high resistance on the wire 51 is recognized. In this case, the potential at the input 41 about the resistance 71 pulled to 0V. This potential is provided by the first analog-to-digital converter 441 is detected in a subsequent evaluation as an error case.

• – Starten des Fahrzeugs durch Einschalten der Energieversorgung,
• – Setzen des vom Elektromotor an den Antriebsstrang abgegebenen Drehmoments auf Null,
• – Abfragen des Potentials am Schleifer des Potentiometers,
• – Überprüfen, ob das Potential an dem Schleifer anzeigt, dass keine Drehmomentanforderung anliegt,
• – Falls der Überprüfungsschritt eine Verneinung ergibt, Wiederholen des Überprüfungsschritts,
• – Falls der Überprüfungsschritt eine Bejahung ergibt, Steuern des Drehmoments des Elektromotors entsprechend dem Potential an dem Schleifer des Potentiometers, das heißt, das Potential am Schleifer wird als Vorgabewert für die Drehzahl benutzt.

The corresponding process steps could proceed as follows:

• Starting the vehicle by switching on the power supply,
• Setting the torque delivered by the electric motor to the drive train to zero,
• - interrogation of the potential at the wiper of the potentiometer,
• Checking that the potential at the wiper indicates that there is no torque request,
• If the checking step yields a negative, repeating the checking step,
• If the verification step gives an affirmative, controlling the torque of the electric motor corresponding to the potential at the wiper of the potentiometer, that is, the potential at the wiper is used as the default value for the speed.

4 shows a bike 100 with electric auxiliary drive, which is integrated in the bottom bracket. Above the bottom bracket 102 is the control circuit 44 that over the wires 51 . 52 and 53 with the throttle grip 2 on a handlebar 101 connected is.

LIST OF REFERENCE NUMBERS

1

module

2

Engine power request handle or throttle grip

4

circuit board

20

moving part

21

immovable part

27

potentiometer

41

connection

42

connection

43

connection

44

control circuit

46

resistance

47

Dimensions

48

Connection for high supply potential

49

resistance

51

management

52

management

53

management

55

evaluation

60

Engine control unit

61

electric motor

71

resistance

100

bicycle

101

handlebars

102

bottom bracket

271

connection

272

connection

273

connection

301

step

302

step

304

step

441

Analog to digital converter

442

Analog to digital converter

443

Analog to digital converter

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 202006013141 U1 [0002]

Claims (14)

Assembly of a motor power request handle ( 2 ) and a control circuit ( 44 ) for the engine power request handle ( 2 ) of a vehicle, wherein the engine power request handle ( 2 ) a potentiometer ( 27 ), wherein the potentiometer ( 27 ) a resistor ( 28 ), a grinder and three connectors ( 271 . 272 . 273 ), wherein the first connection ( 271 ) is connected to the grinder and the second connection ( 272 ) with a first end of the resistor ( 28 ) of the potentiometer ( 27 ) and third connection ( 273 ) with a second end of the resistor ( 28 ) of the potentiometer ( 27 ), the control circuit ( 44 ) a first connection ( 41 ) and a second port ( 42 ), wherein the first connection ( 41 ) of the control circuit ( 44 ) via a first line ( 51 ) with the first connection ( 271 ) of the potentiometer and the second terminal ( 42 ) of the control circuit ( 44 ) via a second line ( 52 ) with the second connection ( 272 ) of the potentiometer ( 27 ) and in the control circuit ( 44 ) a first measuring circuit, which by means of a potential at the first terminal ( 41 ) of the control circuit ( 44 ) determines the value for the motor power desired by the driver, characterized by a second measuring circuit for measuring the potential at the second terminal of the control circuit ( 44 ). An assembly according to claim 1, characterized in that the control circuit ( 44 ) a third port ( 43 ), which is connected via a third line ( 53 ) with the third connection ( 273 ) of the potentiometer ( 27 ), wherein a third measuring circuit for measuring the potential at the third terminal ( 43 ) of the control circuit ( 44 ) is provided. Assembly according to one of the preceding claims, characterized by a series connection between two supply terminals ( 47 . 48 ) for a supply voltage, wherein the series connection two resistors ( 46 . 49 ) in the control circuit ( 44 ) are provided, and contains the potentiometer, wherein the potentiometer ( 27 ) between the resistances ( 46 . 49 ) of the control circuit ( 44 ) is provided. Assembly according to one of claims 1 to 3, characterized in that the second measuring circuit an analog-to-digital converter ( 442 ) contains. Assembly according to one of claims 2 to 4, characterized in that the third measuring circuit an analog-to-digital converter ( 443 ) contains. Assembly according to one of claims 1 to 5, characterized in that an evaluation circuit ( 55 ) is provided for receiving an output signal from the second measuring circuit and for generating a switch-off signal for an electric motor ( 61 ) of the vehicle ( 100 ), when the potential at the second terminal ( 42 ) of the control circuit ( 44 ) either falls below or exceeds a predetermined threshold. An assembly according to claim 6, characterized in that the evaluation circuit ( 55 ) for receiving an output signal from the third measuring circuit and for generating a switch-off signal for an electric motor of the vehicle when the potential at the third terminal ( 43 ) of the control circuit ( 44 ) is a further predetermined threshold either below or exceeds, is formed. Assembly according to one of claims 1 to 7, characterized by a resistor ( 71 ) between the first port ( 41 ) of the control circuit ( 44 ) and a node that has a fixed potential ( 37 ) lies. Vehicle having an electric motor and an assembly according to one of claims 1 to 8, wherein the value measured by the first measuring circuit is used as a reference variable for the rotational speed of the electric motor. Control circuit ( 44 ) for the engine power requirement ( 2 ) of a vehicle, wherein the engine power request handle ( 2 ) a potentiometer ( 27 ) with a slider and a resistor, wherein the control circuit ( 44 ) a first connection ( 41 ) and a second port ( 42 ), wherein the first connection ( 41 ) of the control circuit ( 44 ) for connection via a first line ( 51 ) with the wiper of the potentiometer ( 27 ) of a motor power request handle and the second connection ( 42 ) of the control circuit ( 44 ) for connection via a second line ( 52 ) with one end of the resistor of the potentiometer ( 27 ) is provided, and wherein in the control circuit ( 44 ) a first measuring circuit, which by means of a potential at the first terminal ( 41 ) of the control circuit ( 44 ) determines the value for the motor power desired by the driver and an output signal as a command variable for the rotational speed of an electric motor ( 61 ) is provided, characterized by a second measuring circuit for measuring the potential at the second terminal of the control circuit ( 44 ) for generating a switch-off signal for the electric motor ( 61 ) of the vehicle when the potential at the second terminal of the control circuit ( 44 ) either falls below or exceeds a predetermined threshold. Control circuit ( 44 ) according to claim 10, characterized by a resistor ( 46 ) between one of the supply connections ( 48 ) for a supply voltage and the second terminal ( 42 ) of the control circuit ( 44 ). Control circuit ( 44 ) according to claim 10 or 11, characterized in that the control circuit ( 44 ) a third port ( 43 ) for connection via a third line ( 53 ) with another end of the resistance of the potentiometer ( 27 ), wherein a third measuring circuit for measuring the potential at the third terminal ( 43 ) of the control circuit ( 44 ) is provided. Control circuit ( 44 ) according to claim 12, characterized by a resistor ( 49 ) between a supply connection ( 47 ) for a supply voltage and the third connection ( 43 ) of the control circuit ( 44 ) Control circuit according to one of claims 10 to 13, wherein the value measured by the first measuring circuit is used as a reference variable for the rotational speed of the electric motor.

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