Bosch patent for electric motor with ABS: brake charges battery

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Bosch patent for electric motor with ABS: brake charges battery
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technology & future

Bosch patent for electric motor with ABS: brake charges battery

Bosch patent for electric motor with ABS
Brake charges the battery

Electric two-wheelers are still rare. And models that can recuperate energy, too. Bosch has patented an invention that turns the motor into a brake and generates electricity in the process.


Jens Kratschmar

04/06/2021

When it comes to braking, the Road Traffic Licensing Regulations and Paragraph 41 are clear and detailed. First of all, every motor vehicle must have at least two independent braking systems. In vehicles operated with stored electrical energy, one of the two systems may still be a short-circuit brake – if the electric motor becomes a generator and either generates electricity for the battery or heat.


Bosch patent for electric motor with ABS: brake charges battery


Bosch

This is what a wheel hub motor from Bosch looks like with an additional disc brake. Often used on scooters or electrified mopeds.

Bosch patent for abs-capable electric motor

Bosch has a patent for an invention registered with which you can reduce the size of the braking systems of two-wheelers by means of the electric motor, because a second hydraulic brake is no longer required. The second brake required by law is the electric motor. If the driver initiates braking, the motor becomes a so-called can generator and produces electricity. But not according to the motto “All or nothing”, but in interaction with the braking force generated.


Bosch patent for electric motor with ABS: brake charges battery


Bosch

This is what the motor could look like if it managed without an additional brake. The motor becomes a brake, which saves the weight of the brake and lowers costs.

If the driver uses less hydraulic braking force than the generator can build up braking torque, the hydraulic system lowers the brake pressure on the wheel and increases the efficiency of the recuperation. Conversely: If the required braking force exceeds the braking torque of the motor, the system increases the hydraulic braking force. If this strong braking triggers the ABS, the braking torque of the electric motor is also controlled in order to keep both wheels turning.

What are my profits?

The advantages can be summed up quickly. First of all, the system always works in the optimal range of maximum recuperation of the engine, since the entire braking torque is provided by the engine. Furthermore, the motor saves the entire brake system of the corresponding axis, which completely reduces the maintenance effort for this component.

Bosch patent for electric motor with ABS: brake charges battery

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opinion poll

Which electric concept on two wheels is the right one for you?

Voted 9061 times

If so, then only a powerful electric motorcycle.

I can imagine an electric scooter for commuting and city traffic.

A small, agile electric moped is definitely fun.

None at all.

Conclusion

Converting kinetic energy into heat when braking is quite a waste. Converting into electrical energy can contribute to efficient and effective e-mobility. This is underlined today by many electric cars, which brake proportionally more often with recuperation than with the actual service brake.

Bosch is thinking a little further here and believes that it can use the electric motor as the sole brake on an axle, controlled in combination with a conventional hydraulic brake and ABS control – an interesting solution for the main use of wheel hub motors on small motorcycles and scooters in urban traffic.

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