Vehicle and method for braking a vehicle with electric drive when stationary

Abstract

The invention relates to a vehicle comprising a control device and at least one drive wheel, which is in operative connection with an electric machine, wherein the control device has a regulating part which uses the electric machine to brake the drive wheel when stationary, wherein the control device has a detection device which is designed to identify whether the at least one drive wheel has ground contact when stationary, and wherein the control device is designed to brake the drive wheel using an alternative regulating part and / or brake device when no ground contact is identified.

Description

Technical Field

[0001] The present invention relates to a vehicle and a method for braking an electrically driven vehicle when it is stopped or stationary. Background Technology

[0002] In electrically powered vehicles, the motor installed there is used to generate braking torque. Braking while stationary is a special case because the motor must be precisely controlled or adjusted so that the vehicle remains stationary without moving forward or backward. For this purpose, the vehicle has a corresponding control or adjustment unit that precisely coordinates for this application (stationary adjustment). If the drive wheels do not have contact with the ground, a problem arises. This creates a hazard of the adjuster oscillating during braking. This can pose a risk of injury to those nearby, for example, when the vehicle is jacked up for maintenance work. Summary of the Invention

[0003] Therefore, the object of the present invention is to provide a vehicle and a method for braking a vehicle with an electric drive when stationary, wherein, in particular, the potential dangers of known vehicles are to be reduced.

[0004] This task is accomplished by the vehicle according to claim 1 and the method according to claim 10. Further advantages and features arise from the dependent claims, the specification, and the drawings.

[0005] According to the present invention, a vehicle includes a control device and at least one drive wheel operatively connected to a motor. The control device has an adjustment mechanism that, when stationary, uses the motor to brake the drive wheel. The control device also includes a detection device designed to identify whether the at least one drive wheel has ground contact when stationary. Furthermore, the control device is designed to use an alternative adjustment mechanism and / or braking device to brake the drive wheel when no ground contact is detected. Therefore, the vehicle advantageously can identify whether the at least one drive wheel has ground contact. For example, ground contact may not exist when the vehicle is jacked up for maintenance work.

[0006] The vehicles of this type are electrically operated vehicles, particularly those having at least one electric drive. This can be bicycles or motor vehicles with an electric auxiliary motor, such as passenger cars, commercial vehicles, or particularly motorized bicycles, such as motorcycles or scooters. The control device is suitably designed to use an alternative adjustment and / or at least one other component to brake the drive wheels when there is no ground contact. In other words, instead of using the adjustment that would otherwise be used when stationary, an alternative adjustment is used, particularly one that takes into account the situation where the drive wheels are not in ground contact.

[0007] Using an electric motor for braking means operating, and in particular adjusting, the motor so that the vehicle can be stopped indirectly by the torque output by the motor.

[0008] If one or more drive wheels connected to one or more motors do not have ground contact, the regulator can oscillate when stationary (stationary regulation) when the brake is actuated. This can pose a risk of injury to people in the vicinity who are working on the jacked (drive) wheels. The background is that the regulator or regulating unit is intended to move and correspondingly parameterize a vehicle with a corresponding mass. Instead, only the wheels with a much lower mass / inertia are moved. The regulator is not designed for this application and is therefore prone to oscillation.

[0009] The detection device is suitably designed to communicate with the vehicle's onboard electronics to identify the absence of ground contact. Furthermore, it can suitably relay information about the vehicle's status. This can suitably occur in two directions: from the detection device to the onboard electronics and in the opposite direction. The information may include descriptions of whether the vehicle is being lifted, placed on a lift platform, or mounted on a main support, etc. The vehicle's onboard electronics are preferably operatively connected to sensors designed to identify the vehicle's status. Such sensors may include, for example, suspension travel sensors designed to detect when spring elements (e.g., shock absorbers on the wheels) are fully extended, etc. The driver can also notify the onboard electronics via a suitable interface that the vehicle is being lifted or jacked, or more generally, that (maintenance) work is being performed.

[0010] The vehicle electronics also include a motor control unit, which is suitably connected to the motor. The motor control unit preferably includes a torque estimator designed to detect torque values ​​based on motor current, motor input power, and / or motor speed. These values ​​can be advantageously used to control and / or regulate the motor.

[0011] The detection device suitably includes one or more sensors. In particular, the detection device is suitably designed to interact with the aforementioned sensor elements.

[0012] Suitably, the at least one sensor is a speed sensor, a torque sensor, or an acceleration sensor. Advantageously, the wheel and / or motor speed can be detected by one or more speed sensors. Furthermore, it is advantageous to detect the speed gradient of the drive wheel and / or at least one motor. A torque sensor can be used to detect the target torque and actual torque of the motor. An acceleration sensor can be used to identify whether the vehicle is moving, etc.

[0013] According to one embodiment, the control device is designed to actively operate the motor to detect ground contact. The control device can, for example, detect the reaction of at least one motor by cyclically manipulating it. This manipulation also occurs when the drive / brake is not actuated. Alternatively, no ground contact can also be detected when the driver actuates the vehicle's drive and / or brakes.

[0014] According to one embodiment, the at least one braking device is a parking brake. If present, the braking device may also be a service brake, such as a drum brake or disc brake, which is present when necessary to decelerate and bring the vehicle to a stop during normal operation. Thus, more precisely, the vehicle can (particularly only) be braked by the motor and can also be stopped when stationary. However, legal requirements may necessitate the presence of an additional friction brake for safety reasons. The braking device may also be a brake integrated into the motor.

[0015] Suitably, the adjustment strategy of the alternative adjustment unit is configured to take into account the situation where there is no ground contact. Preferably, the adjustment parameters of the alternative adjustment unit are adjusted accordingly, with particular emphasis on preventing rotation of at least one drive wheel.

[0016] According to one embodiment, the control device is designed to change or adjust the vehicle's operating mode. Furthermore, it can adjust adjustment parameters, activate alternative adjustment units, or switch the motor's brakes to an operating mode suitable for freely rotating wheels.

[0017] The present invention also relates to a method for braking a vehicle having an electric drive while stationary, wherein the vehicle has at least one drive wheel operatively connected to an electric motor, wherein the method comprises the following steps: - Adjust the motor to brake or stop the vehicle when stationary; - Detect whether the at least one drive wheel has ground contact; - In the absence of ground contact, use alternative adjustment and / or at least one other component to brake or stop the vehicle.

[0018] The advantages and features mentioned for the vehicle are similarly and correspondingly applicable to this method, and vice versa. The vehicle is stopped or braked by the motor when stationary (stationary adjustment). For this purpose, the driver does not necessarily need to activate the brakes. It may be sufficient for the driver to remove their foot from the accelerator pedal or (for a motorized bicycle) not to touch the throttle. Advantageously, this method allows for the clear identification of potential hazards. In particular, it prevents the rotation of drive wheels that are not in contact with the ground, thus avoiding potential injury to those nearby. For this purpose, it is appropriate to use sensors and / or components already known and present in the vehicle. Such sensors may include, for example, speed sensors, torque sensors, suspension travel sensors, acceleration sensors, tilt sensors, etc. The aforementioned components refer to braking devices in the vehicle, for example, those used as service brakes or parking / locking brakes. This method also allows for communication with the driver. The driver can, for example, be informed that, due to vehicle maintenance, the absence of ground contact must be taken into account when necessary. This method can also be activated, for example, when the vehicle's on-board diagnostic tools are in operation.

[0019] The vehicles described herein are particularly motor vehicles, such as passenger cars, commercial vehicles, or especially motorized bicycles, such as motorcycles, scooters, or generally single-track or multi-track tilting vehicles, including tricycles, quadricycles, and LMW (tilting multi-wheel) vehicles. However, in principle, the vehicle can also be an electric bicycle. Here, safety can be significantly improved, for example, if the bicycle is mounted on a maintenance stand and the wheels do not have ground contact. Attached Figure Description

[0020] Further advantages and features will emerge from the following description of the embodiments of the vehicle or method with reference to the accompanying drawings.

[0021] Figure 1 A circuit diagram illustrating an implementation of a method or vehicle is shown schematically. Detailed Implementation

[0022] Figure 1A block circuit diagram illustrating an embodiment of the method or vehicle according to the invention is shown. A control device 10 can be seen, designed to operate or regulate a motor 20 via an adjustment unit 30. Specifically, the motor 20 can be adjusted so that the vehicle can be stopped or braked by the motor 20 when stationary (stationary adjustment). The control device 10 suitably includes a detection device 40 comprising one or more sensors. Examples include: a speed sensor, a torque sensor, an acceleration sensor, a suspension travel sensor, a tilt sensor, etc. This sensor or these sensors can be used to identify whether at least one drive wheel of the vehicle has ground contact. If no ground contact is detected, at least one drive wheel can be braked or stopped using an alternative adjustment unit 32 or a separate braking device 50. The control device 10 is also suitably equipped with at least one input terminal 60, through which it can communicate, for example, with onboard electronics. The onboard electronics can then receive and correspondingly forward information from the driver via a suitable interface. Similarly, the control device 10 can communicate with the vehicle via at least one output terminal 62 to, for example, forward information, change operating modes, etc.

[0023] List of reference numerals

[0024] 10 Control Devices

[0025] 20 motors

[0026] 30 Adjustment Section

[0027] 32 Alternate Adjustment Section

[0028] 40 detection devices

[0029] 50 Braking System

[0030] 60 input terminal

[0031] 62 output terminals

Claims

1. A vehicle, comprising a control unit (10) and at least one drive wheel, said at least one drive wheel being operatively connected to a motor (20), wherein, The control device (10) has an adjustment unit that uses the motor (20) to brake the drive wheel when stationary, wherein the control device (10) has a detection device (40) designed to identify whether the at least one drive wheel has ground contact when stationary, and wherein the control device (10) is designed to use an alternative adjustment unit (32) and / or a braking device (50) to brake the drive wheel when no ground contact is detected.

2. The vehicle according to claim 1, wherein, The detection device is designed to communicate with the vehicle's onboard electronics to identify when there is no ground contact.

3. The vehicle according to claim 1 or 2, wherein, The detection device includes one or more sensors.

4. The vehicle according to claim 3, characterized in that, The at least one sensor is a speed sensor, a torque sensor, or an acceleration sensor.

5. The vehicle according to any one of the preceding claims, wherein, The control device is designed to actively manipulate or operate the motor to detect ground contact.

6. The vehicle according to any one of the preceding claims, wherein, The braking device is a parking brake.

7. The vehicle according to any one of the preceding claims, wherein, The braking device is a service brake.

8. The vehicle according to any one of the preceding claims, wherein, The adjustment strategy of the alternative adjustment unit is set to take into account the case of no ground contact.

9. The vehicle according to any one of the preceding claims, wherein, The control device is designed to change or adjust the operating mode of the vehicle.

10. A method for braking a vehicle with an electric drive while stationary, wherein, The vehicle has at least one drive wheel, which is operatively connected to a motor. The method includes the following steps: - Adjust the motor to brake or stop the vehicle when stationary; - Detect whether the at least one drive wheel has ground contact; - Use alternative adjustment and / or at least one braking device to brake or stop the vehicle when no ground contact is detected.

Images