Toyota Motor Corporation and Advics Co. | Date: 2017-01-11
An air detector detects the presence or absence of air in a hydraulic braking system including a rearward-hydraulic-pressure controller 28 connected to a rearward chamber 66 located behind a pressurizing piston 34 in a master cylinder 26. When an instruction for detecting the presence or absence of air is output, a hydraulic pressure is accumulated in an accumulator 108 at S1. Pressure holding valves 170 are closed at S2. The presence or absence of air in an upstream portion 180 including the rearward-hydraulic-pressure controller 28 is detected at S3 based on a relationship between a servo pressure and a time of controlling an input chamber 122. The pressure holding valves 170 are opened at S6. The presence or absence of air of a downstream portion 182 including a pressure chamber 42 is detected at S7 based on a relationship between a stroke of a brake pedal 24 and the servo pressure. With these processings, the presence or absence of air is detected for the upstream portion and the downstream portion, separately. Thus, when air is detected, it is possible to identify a portion at which the air exists.
Advics Co. | Date: 2015-06-29
A vehicle brake device is provided with: an acquisition unit that acquires travel resistance force produced between a vehicle wheel and a road surface touched by the wheel when, for example, a vehicle having the wheel travels, on the basis of driving force of the vehicle and acceleration of the vehicle; and a control unit that starts a control for supplying braking force to the wheel of the vehicle when a difference between the travel resistance force and a predetermined value exceeds a first threshold value and a differential value of the travel resistance force exceeds a second threshold value.
Advics Co. and Toyota Motor Corporation | Date: 2015-01-08
A vehicle brake device includes a pressure adjusting device wherein as the volume of a pilot chamber is changed by the movement of a piston and the flow rate of liquid flowing in and out of the pilot chamber increases, the amount of movement of the piston increases with reference to the piston position in an equilibrium state where the force corresponding to the pilot pressure and the force corresponding to the output pressure are balanced, whereby the flow rate of the liquid flowing in and out of an output chamber increases. A control device, when judged by a limitation necessity judging portion that the gradient of output pressure should be limited, implements at least one of pressure increasing gradient limit control for opening a pressure decreasing electromagnetic valve under pressure increasing control, or pressure decreasing gradient limit control for opening a pressure increasing electromagnetic valve under pressure decreasing control.
Advics Co. | Date: 2017-02-01
A vehicle brake control device includes an electric motor controlled based on a target energization amount calculated based on an operation amount (Bpa) of a braking operation member. Based on the operation amount (Bpa), it is determined whether or not an inertia compensation control for compensating for the influence of the inertia of a brake actuator is necessary. When the inertia compensation control is determined to be necessary, an inertia compensation energization amount for compensating for the influence of the inertia of the brake actuator is calculated based on a time-series pattern set in advance based on the maximum response of the brake actuator. Based on the inertia compensation energization amount, the target energization amount is calculated. The vehicle brake control device is thus able to generate a braking torque that appropriately compensates for the influence of the inertia of the entire device including the inertia of the electric motor.
Advics Co. | Date: 2015-03-31
This brake ECU executes vehicle downhill control for adjusting the braking force to be applied to a vehicle by actuating a brake actuator such that the vehicle body speed does not exceed a target speed. Also, in cases where the accelerator pedal is being operated in a state where the vehicle downhill control is being executed, the brake ECU changes the target speed such that, the longer the operation duration which is the duration for which the accelerator is operated, the higher the target speed.
Advics Co. | Date: 2017-06-28
Electric parking brake devices are configured such that a parking lever (17) is driven by an electric actuator (20). The electric actuator (20) according to the present invention is provided with: an electric motor (21) which can be driven in a forward/reverse direction and of which operation is controlled by a motor control unit (ECU) according to rotational loads; a conversion mechanism (22) capable of converting a rotational motion into a linear motion, moving the parking lever (17) from a return position toward an operating position through the forward rotation of the electric motor (21), and moving the parking lever (17) from the operating position toward the return position through the reverse rotation of the electric motor (21); and a load applying mechanism (a stopper (27) and a disc spring assembly (28)) for applying a predetermined rotational load to the electric motor (21) by driving a constituent member of the conversion mechanism (22) after the parking lever (17) is moved from the operating position to the return position through the reverse rotation of the electric motor (21).
Aisin Seiki and Advics Co. | Date: 2016-01-06
A control signal output unit (a drive control unit) (11i) executes control to retain a gear position corresponding to a motor generator (3) during deceleration of a vehicle and regeneration executed by the motor generator (3).
Denso Corporation and Advics Co. | Date: 2016-07-21
A vehicle-use brake apparatus has a control unit which includes a correcting pressure acquisition section that acquires a flow rate correcting pressure corresponding to a discharge amount of brake fluid discharged by a pump, a command differential pressure acquisition section that acquires a command differential pressure by performing a flow rate correction where the flow rate correcting pressure is subtracted from a target wheel cylinder pressure, and a correction restriction section that performs a correction restriction by which the flow rate correcting pressure is reduced or the flow rate correction is not performed if an actual wheel cylinder pressure is smaller than a target wheel cylinder pressure.
Toyota Motor Corporation and Advics Co. | Date: 2016-01-14
A vehicle braking control apparatus includes an obstacle detection unit configured to detect an obstacle ahead of a vehicle, and to detect a distance to the obstacle from the vehicle, and a relative speed of the obstacle with respect to the vehicle; an electronic control unit configured to generate a braking force of the vehicle automatically based on the distance and the relative speed, and to weaken the braking force when a value subtracting a deceleration amount of a vehicle speed of the vehicle since a start of generating the braking force, from a predetermined upper-limit deceleration amount is less than or equal to a predetermined threshold. The upper-limit deceleration amount is set to increase while an elapsed time increases since the start of generating the braking force, at least after a predetermined first time has passed since the start of generating the braking force.
Toyota Motor Corporation and Advics Co. | Date: 2016-06-20
A hydraulic braking system includes: a master cylinder including a pressurizing piston, a rearward chamber, and a pressure chamber; and a rearward-hydraulic-pressure controller connected to the rearward chamber and including a pressure increase valve and a regulator for controlling a hydraulic pressure in an output chamber. An air detector includes: an upstream detector, including the rearward-hydraulic-pressure controller, for detecting presence or absence of air in an upstream portion based on a relationship between the hydraulic pressure in the output chamber and an open time of the pressure increase valve; and a downstream detector for detecting presence or absence of air in a downstream portion based on a relationship between a stroke of the pressurizing piston and the hydraulic pressure in the output chamber. The downstream portion includes a portion located downstream of the pressure chamber of the master cylinder.