Vehicular braking control apparatus and abnormality detection method for vehicular braking apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasayuki Soga
Life of this patent
Estimating the term…
Abstract
In an electronic control brake system capable of controlling the braking force by adjusting the hydraulic pressure applied to each wheel cylinder through the use of a pressurization source and a hydraulic pressure adjusting portion, the hydraulic pressure applied to a wheel cylinder is increased by a pressurization source while the brake is not operated during a stop of the vehicle. After that, a master cutoff valve is opened so as to release the hydraulic pressure to a master cylinder. Changes in the master pressure are investigated via a master pressure sensor so as to determine whether there is an abnormality in a stroke simulator or a simulator cutoff valve.
Claims19
A vehicular braking control apparatus comprising:
- a master cylinder that generates a hydraulic pressure corresponding to a brake operating force;
- a first communication passageway that connects the master cylinder and a wheel cylinder of a braking apparatus in communication;
- a first open-close valve disposed on the first communication passageway;
- a stroke simulator that is connected to the first communication passageway between the first open-close valve and the master cylinder and that provides a reaction force corresponding to the brake operating force;
- a pressurization source that generates a predetermined hydraulic pressure;
- a hydraulic pressure adjusting portion that connects the pressurization source and the first communication passageway between the first open-close valve and the wheel cylinder and adjusts the hydraulic pressure applied to the wheel cylinder;
- a hydraulic pressure sensor that detects the hydraulic pressure on the first communication passageway between the first open-close valve and the master cylinder;
- and
- a control portion that, while a brake is not operated, closes the first open-close valve, and controls the hydraulic pressure adjusting portion so as to increase the hydraulic pressure on a wheel cylinder side of the first communication passageway while maintaining a closed state of the first open-close valve, and then opens the first open-close valve, and determines whether there is an abnormality of the stroke simulator based on a change in outputs of the hydraulic pressure sensor before and after the first open-close valve is opened.
A method for detecting an abnormality of a braking apparatus that has a stroke simulator that provides a reaction force corresponding to a brake operating force,
- wherein a first open-close valve is disposed on a communication passageway that connects in communication a wheel cylinder of the braking apparatus and a master cylinder that generates a hydraulic pressure corresponding to the brake operating force, and
- wherein the stroke simulator is connected to the communication passageway between the first open-close valve and the master cylinder,
- the method comprising:
- increasing a hydraulic pressure on a wheel cylinder side of the communication passageway while the first open-close valve is closed while a brake is not operated;
- opening the first open-close valve after increasing the hydraulic pressure on the wheel cylinder side;
- measuring a hydraulic pressure in a communication passageway between the first open-close valve and the stroke simulator which occur before and after the first open-close valve is opened;
- and
- determining whether there is an abnormality of the stroke simulator based on a change in the measured hydraulic pressure.
Dependencies are inferred from the claim text.