Electric brake device
An electric braking and electric motor technology, applied in the direction of brakes, etc., can solve problems such as defective parts, and achieve the effect of suppressing heat generation and preventing the decrease of braking force.
Active Publication Date: 2015-01-21
HONDA MOTOR CO LTD
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AI Technical Summary
Problems solved by technology
[0011] However, in such a conventional electric brake device, in the control based on the brake pressure of the electric motor, the electric motor may be locked and current may continue to flow continuously to the same two phases.
In this case, if the electric motor does not rotate or the current flows to the two phases in a continuous energization state, the temperature of only the two phases will rise, and there may be problems with components due to heat generation.
Method used
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Embodiment approach
[0080] figure 1 It is a schematic configuration diagram of a vehicle equipped with a vehicle brake device according to an embodiment of the present invention. The brake system for a vehicle is composed of both a By-Wire brake system and a conventional hydraulic brake system. The Wire-by-wire brake system is used for normal use and transmits an electric signal to apply the brakes. When working, the hydraulic brake system is used as a failsafe to transmit hydraulic pressure to make the brake work.
[0081] The vehicle braking system 2 of the present embodiment (refer to figure 1 and figure 2 ) is a type of electric brake device that makes a motor (travel motor) function as a generator and recovers kinetic energy during travel as electrical energy to generate braking force.
[0082] like figure 1 As shown, the vehicle 1 has four wheels 10 , the front two wheels 10 are connected to the axle 8 a, and the rear two wheels 10 are connected to the axle 8 b. Axle 8 a receives driv...
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There is provided a brake system for vehicles, the brake system including: a slave cylinder S / C to generate a hydraulic pressure by an electric motor according to a braking operation by a driver; and a controller to decrease an operation amount of the slave cylinder S / C when an operation amount of the electric motor is maintained, then increase an operation amount of the slave cylinder S / C when a change occurs in an operation amount of the electric motor subsequently. The controller determines whether or not the phase currents Iu, Iv, Iw of the electric motor are in two-phase continuously energized state and the state remains for a certain time or longer. When the determination conditions are satisfied, the controller performs commutation control to generate commutation in the electric motor by reducing a target hydraulic pressure of the slave cylinder S / C.
Description
technical field [0001] The invention relates to an electric braking device applicable to a wire-controlled braking system. Background technique [0002] A By Wire electric brake system calculates a target brake pressure using driver input such as a pedal stroke amount, and generates hydraulic pressure through various actuators to achieve the target hydraulic pressure. [0003] In an electric braking system, an electric motor is used as an actuator that generates braking pressure. [0004] Patent Document 1 discloses a vehicle braking device including: a master hydraulic cylinder to which an operator's brake operation is input; The slave hydraulic cylinder of the driving device. [0005] In the slave hydraulic cylinder of this vehicle brake device, when the electric motor is driven, the piston is advanced via a gear mechanism or the like, thereby generating brake hydraulic pressure in a hydraulic pressure chamber formed in front of the piston, and the brake hydraulic pressu...
Claims
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IPC IPC(8): B60T8/17
CPCB60T13/745B60T8/176B60T13/66B60T13/58B60T13/146B60T13/662B60T13/686B60T8/4081
Inventor 岛田贵史植浦总一郎木寺和治
Owner HONDA MOTOR CO LTD