Abstract: An electronic parking brake control system and method for controlling a parking brake of a vehicle. The system includes an electronic parking brake variable switch configured to produce an application signal based on an amount or an amount of time the switch is pulled upward or pushed downward. The system also includes an indicator configured to indicate an amount of application of the parking brake based on the application signal. The system also includes an electronic brake unit coupled to the electronic parking brake variable switch. The electronic brake unit is configured to receive the application signal, and transmit a rear brake signal to a plurality of rear brake actuators to apply a plurality of rear brakes based on the application signal when a speed of the vehicle is below a threshold speed or the vehicle is in a low gear.

Abstract: A brake controller is provided with a positive efficiency operation limiter configured to provide a time for maintaining or decreasing a torque to be generated by a motor, such that a braking force generated by pressing between a brake rotor and friction pads does not decrease, while a braking force command value outputted from a braking force command section increases. For example, the limiter limits a ratio of a time for increasing the braking force, relative to a sum of the time for increasing the braking force and the time for maintaining or decreasing the braking force, to a predetermined value or less.

Abstract: A method for estimating water content of brake fluid in a brake system including brake calipers and a brake fluid container, the brake calipers and the container each including a sensor configured to detect a water content of the brake fluid, the method including: arranging the brake system in a controlled environment; for a predetermined time period, exposing the brake system to a controlled temperature and humidity such that an increase in water content in the brake fluid is accelerated; determining the water content of the brake fluid in the brake fluid container and in each brake caliper as a function of time; and based on the determined water content as a function of time, establishing a model describing the relation between the water content of brake fluid in a brake caliper and the water content in the brake fluid in the brake fluid container.

Abstract: A braking device includes a stroke simulator, a hydraulic pressure generation unit, a reaction hydraulic pressure detection unit, a master hydraulic pressure detection unit, and a bottoming determination unit. The stroke simulator includes a cylinder and a piston slidably movable inside the cylinder in conjunction with an operation of a brake operation member. The stroke simulator causes a reaction force chamber to generate a reaction hydraulic pressure and applies a reaction force. The hydraulic pressure generation unit generates a master hydraulic pressure by driving a master piston and supplies a hydraulic pressure to a wheel cylinder. The reaction hydraulic pressure detection unit detects the reaction hydraulic pressure. The master hydraulic pressure detection unit detects the master hydraulic pressure. The bottoming determination unit determines whether the master piston is in a bottoming state based on the reaction hydraulic pressure and the master hydraulic pressure.

Abstract: A method of operating a hydraulic apparatus comprising a hydraulic circuit region and hydraulic machine which is controlled to displace pulses of fluid of known volume into or out of the hydraulic circuit region, generating pulses of pressure in the hydraulic circuit region and torque in the hydraulic machine shaft. The response of parts of the hydraulic apparatus to these pulses is measured and used to determine properties of the hydraulic apparatus. The response of the pressure in the hydraulic circuit region to pulses at different pressures can be used to measure the hydraulic stiffness of parts of the hydraulic circuit region. It is possible to detect faults and to make measurements useful in subsequent operation of the hydraulic apparatus.

Abstract: A method for measurement of contact maintaining control valve current for a hydraulic actuator may comprise sending, by a brake controller, a current signal to an electromechanical valve assembly, receiving, by the brake controller, a pressure feedback signal, increasing, by the brake controller, a value of the current signal, and determining, by the brake controller, a contact current value based upon the pressure feedback signal.

Abstract: A braking device for a vehicle includes a friction brake device, a regeneration bake device, a control portion which controls the friction braking force and the regeneration braking force through a cooperative control and a state judging portion which judges whether a vehicle state is in a stopped state or a non-braking operation state where the braking operation is not performed, The control portion executes a factor change control which suppresses an increase of change inclination of the friction braking force by changing a factor relating to a friction used when the hydraulic pressure is converted into the friction braking force to an increasing side and returns the factor to a value at a non-operation of the factor change control when the vehicle state is judged to be in the stopped state or the non-braking operation state by the state judging portion.

Abstract: An object of the present invention is to provide a brake apparatus capable of acquiring a stable brake performance. A brake apparatus includes a master cylinder configured to be activated according to a brake operation performed by a driver, a reservoir tank divided into at least a first chamber connected to a wheel cylinder via the master cylinder and a second chamber connected to a hydraulic source configured to increase a pressure of brake fluid and transmit the brake fluid to the wheel cylinder, a brake control unit configured to perform brake control of transmitting the brake fluid to the wheel cylinder, and a fluid level detection unit configured to detect a fluid level of the brake fluid in the reservoir tank.

Abstract: An electrically actuated braking system for an aircraft, including: an electro-mechanical brake actuator (EMAbrake) proximate a wheel of the aircraft, the EMAbrake including a motor; an electro-mechanical actuator controller (EMAC) including a first motor controller for generating a first drive signal for the EMAbrake, and a second motor controller for generating a second drive signal for the EMAbrake, wherein the first motor controller and the second motor controller are dissimilar so as to provide protection against common mode failure of the first and second motor controllers.

Abstract: A vehicle control device includes: an angle sensor configured to detect a rotation angle of a steering system of a vehicle; an actuator mounted on the vehicle; and a control device configured to perform a vehicle control by controlling the actuator based on the detection result of the angle sensor. At a time the angle sensor has failed, the control device is configured to limit the vehicle control at a time an estimation angle error obtained based on a failure time of the angle sensor and the rotation speed of the steering system is not smaller than a predetermined reference value and not to limit the vehicle control at a time the estimation angle error is smaller than the reference value.

Abstract: A method for improving the availability of an electromechanical actuator of an electromechanical or electrohydraulic brake system in a motor vehicle, including electronic motor regulation functioning in a non-restricted operating mode (normal operation) for a field-commutated electric motor actuated by pulse width modulation. An electronic device having a setpoint value interface (1) for presetting setpoint variables and parameters, a module for calculating pulse width modulation switching times (4), a module for dead time compensation (5), a power electronics module (6) for actuating an electric motor (7) actuated on three phases, including a module for setpoint current determination (2) which is electrically connected to the field-oriented current controller (3) and receives, via this connection, setpoint current values (Id_set, Iq_set) calculated using various state and/or estimated variables and stored parameters from the module for setpoint current determination.

Abstract: A system and method for maintaining operational states of vehicle remote actuators during failure conditions is described. The system controller determines if the actuator controller is operating properly by monitoring an enable line and initiates a safe mode of operation if the actuator is not operating properly.

Abstract: A service brake device of a vehicle, including at least one ABS pressure control valve which is controlled for slip-regulated braking by an electronic control unit, has at least one inlet valve and one outlet valve and is arranged upstream of a pressure medium actuated brake cylinder, a pressure medium line which supplies the ABS pressure control valve with pressure medium and into which a pressure controlled by a valve device arranged upstream of the ABS pressure control valve is feedable, wherein the valve device feeds a pressure derived from a reservoir pressure of a pressure medium reservoir into the pressure medium line as a function of an activation by the electronic control unit.

Abstract: Systems and methods are provided for restarting an engine that can be selectively deactivated during idle-stop conditions. In one embodiment, current is directed to a starter motor and an electric brake sequentially by limiting the current supplied to one while current is supplied to the other, an order of delivering the current based on a timing of a restart request relative to an electric brake request, as well as vehicle operating conditions at the time the requests were received. By coordinating the operation of a starter motor with the operation of an electric brake, loading of the engine system's electrical supply can be reduced.

Abstract: A vehicle braking force control device which, at a normal time, performs antilock brake control when the slip ratio of a wheel has become equal to or greater than a predetermined threshold. The control device acquires from the engine control unit an accelerator pedal position signal corresponding to an accelerator pedal position, a clutch connection signal corresponding to a state of connection of a clutch, and a power transmission signal corresponding to a state of power transmission of a transmission. When engine braking is large on the basis of the accelerator pedal position signal, the clutch connection signal, and the power transmission signal, the vehicle braking force control device changes the predetermined threshold value to an offset threshold value that makes it harder to perform the antilock brake control than at the normal time.

Abstract: A mechanism for determining whether a malfunctioning pressure sensor has returned to a normal or acceptable operating range. The mechanism includes controllers and methods that perform a “good check” on the sensor to determine whether the sensor has returned to normal or acceptable operation after a malfunction has been detected. When a previously-malfunctioning sensor passes the “good check,” warning lights (or tell-tale) indicators are shut off and systems that relied upon information from the malfunctioning sensor return to normal operation.

Abstract: A method for operating a hydraulically working brake system of a vehicle, in particular a motor vehicle, having at least one brake line assigned to at least one wheel brake, the brake line being connected or connectable via a switchable valve to the high pressure side of a pump unit for brake fluid. It is provided that the valve is closed when an unexpected pressure drop is detected in the brake line. Also described is a brake system for a vehicle, in particular a motor vehicle.

Abstract: An electromechanical brake system and an associated method with a failsafe energy supply, have a first to fourth brake module with at least one control unit and brake actuation unit. In order to supply the modules with electrical energy, the control unit and the brake actuation unit are each connected to at least one main energy supply unit via independently fed lines. In order to supply additional electrical energy to the modules, a first emergency energy supply unit is connected to the control unit and brake actuation unit of the first and fourth brake module and a second emergency energy supply unit is connected to those of the second and third brake module, respectively via additional independently fed lines, wherein the selection of the energy supply unit is made via switches actuated at least partially separately from one another via at least one central control system.

Abstract: A method of detecting an in-range failure of a brake pedal position sensor includes calculating the difference between a minimum position and a maximum position of the brake pedal position sensor. The calculated difference is weighted to define a fast test weighted input value and/or a full test weighted input value. A cumulative test result value is incremented by the fast test weighted input value and/or the full test weighted input value. The cumulative test result value is filtered to define a moving average of the cumulative test result value after each incremented occurrence. The moving average of the cumulative test result value is tracked to determine if the brake pedal position sensor is functioning properly.

Abstract: A system, apparatus and method of controlling a braking system of a vehicle having a plurality of rotating wheels and a plurality of brakes, each brake corresponding to one of the plurality of wheels, is provided. In controlling the brakes, an operational status of the braking system is determined. Based on the determined operational status, different feedback regulation schemes are selectively implemented to control the brake force applied by the brakes.

Abstract: In a brake control apparatus that controls braking forces which are applied to wheels based on the pressure of the hydraulic fluid, when the pressure detected by a control pressure sensor (73) is equal to or higher than a predetermined value while a partition valve (60) is closed, a master cut valve (64) is closed to suppress an increase in the pressure in a first passage (45) in a first hydraulic circuit (37), to which the control pressure sensor (73) is connected. Alternatively, the control pressure sensor (73) is protected against overpressure by opening the outlet valve (56,57) or the pressure-decreasing valve (67).

Abstract: A motor vehicle includes an electrohydraulic brake system with driving dynamics control, a master brake cylinder (1), wheel brakes (75-78), and at least one pressure fluid supply device (94, 95) actuated by an electronic control unit. The pressure can be applied to the wheel brakes (75, 76, 77, 78) of the vehicle which are also connectable to the master brake cylinder (1) by way of a closable hydraulic connection (73, 74). A device for detecting a brake application includes a magnet (35) as a signal transmitter and a sensor element (36). The sensor element (36), upon piston movement of the master cylinder (1), senses a change in the magnetic field and outputs a digital signal and an analog signal. The two signals are passed on to an electronic control unit and are evaluated in the electronic control unit.

Abstract: A brake control system for a vehicle includes a first controller having a first brake operation quantity sensor and a second controller executing a different control from that of the first controller and having a second operation quantity sensor. The second controller may include a master pressure acquisition unit for acquiring a master pressure and a failure detection unit for detecting a failure of the first controller on the basis of the brake operation quantity detected by the second brake operation quantity sensor and the master pressure acquired by the master pressure acquisition unit.

Abstract: A motor vehicle has wheels on which it travels, a powertrain delivering propulsion torque to at least some of the wheels propel the vehicle, and a service brake system having service brakes. When the service brakes are applied by a service brake actuator, braking torque is applied to at least some wheels. A first device provides data representing a velocity that correlates with velocity of the vehicle, and a second device associated with the actuator provides data that distinguishes between application and non-application of the service brakes by the actuator. A processor monitors data from the first and second devices and processes the monitored data to provide a data output when the first device has disclosed velocity change indicative of the service brakes having been applied without the second device having disclosed that the service brakes have been applied.

Abstract: The method of maintaining optimal braking and skid protection for a two-wheeled vehicle wheel with a wheel speed sensor failure involves providing pulsed braking pressure to the affected wheel with the wheel speed sensor failure. If an incipient or initial skid on another wheel with a functioning wheel speed sensor has occurred, the pulsed braking pressure to the affected wheel is limited to the brake pressure command that caused the last incipient or initial skid on the other wheel, scaled by a factor for safety. Otherwise the pulsed braking pressure to the affected wheel is limited to be no greater than the greatest commanded brake pressure to the other wheel. The pulsed braking pressure is also limited to be less than the brake pressure commanded to the affected wheel.

Abstract: A brake monitoring system and method for a vehicle having multiple axles and a plurality of brake actuators and an engine control module, each brake actuator being associated with one of the axle. The system include sensors for measuring, in real-time, brake pressure and brake lining wear, and generating first and second signals. The first and second signals are received and stored in a chassis communications module. The chassis communications module detects fault condition of the brakes as a function of the first and/or second signals and for recording the fault condition, the fault condition being one of a brake monitor warning and a brake lining warning and provides an indication of status via warning lights.

Abstract: A method for controlling a self-energizing disc brake having an electric actuator in which an activation force applied to the actuator is amplified using a self-energizing device arranged between the actuator and brake lining is described. The method has a brake application unit for applying at least one brake lining to one side of a brake disc by carrying out an application movement of the brake lining relative to the brake disc, the application movement having at least a first movement component in a direction parallel to a rotational axis of the brake disc and a second movement component in a direction tangential to the rotational axis of the brake disc. The method includes also controlling at least one electromotive drive for activating the brake application unit. Rotation of the shaft of the electromotive drive is converted to a non-linear displacement of the brake pad in the tangential direction.

Abstract: A method of testing a braking device in a drivetrain of a vehicle which includes at least one tractive element coupled to a traction motor. The method includes: (a) applying the braking device to a tractive element of the vehicle; (b) using an electronic controller, causing the traction motor to apply a predetermined force to the tractive element; and (c) using the controller, monitoring the tractive element for movement while the force is being applied. A dynamic braking or “retarder” function may also be tested. A system for carrying out the method is provided.

Abstract: A fluid level detecting apparatus detects the level of fluid in a reservoir. When the fluid level detecting apparatus detects that the fluid level has reached a minimum fluid level, an ECU issues a warning. If, after the warning has been issued, the fluid level detecting apparatus detects that the fluid level has reached a failsafe mode operation fluid level, which is lower than the minimum fluid level, the switches a normal control mode to a failsafe mode, and performs brake control using the failsafe mode.

Abstract: Secure failure of a brake switch is enabled with a simple configuration. When brake switches 6a and 6b are determined to be not ON together and not OFF together (S110 and S112), first and second determination counters perform count respectively (S114 and S120), and on the other hand, when the two brake switches 6a and 6b are determined to be ON together, a count value of the first determination counter is set to zero (S132), and when the brake switches are determined to be OFF together, a count value of the second determination counter is set to zero (S136), those operation being periodically repeated, and when one of the count values of the first and second determination counters exceeds one of respective predetermined values ? and ? (S118 and S214), one of the two brake switches 6a and 6b is determined to be failed, which enables detection of a failure state that one of the brake switches is normally ON or normally OFF.

Abstract: A method for charging an aircraft braking system for use includes monitoring actuations of an aircraft braking system to identify where generating usage and non-wear generating usage of the aircraft braking system, and charging the aircraft braking system for use based on the identified usage of the aircraft braking system. An apparatus for monitoring usage of aircraft brakes and charging the aircraft brakes for usage includes at least one sensor for sensing a brake output parameter when the aircraft brakes are actuated and providing signals indicative of values of the sensed brake output parameter. The apparatus further includes a processing system for processing the signals and determining whether an actuation of the aircraft brakes is a wear generating usage or a non-wear generating usage and operating a pricing scheme based on actuation of the aircraft brakes and the associated usage.

Abstract: The method of maintaining optimal braking and skid protection for a two-wheeled vehicle wheel with a wheel speed sensor failure involves providing pulsed braking pressure to the affected wheel with the wheel speed sensor failure. If an incipient or initial skid on another wheel with a functioning wheel speed sensor has occurred, the pulsed braking pressure to the affected wheel is limited to the brake pressure command that caused the last incipient or initial skid on the other wheel, scaled by a factor for safety. Otherwise the pulsed braking pressure to the affected wheel is limited to be no greater than the greatest commanded brake pressure to the other wheel. The pulsed braking pressure is also limited to be less than the brake pressure commanded to the affected wheel.

Abstract: A method for providing anti-skid braking control for a vehicle having a plurality of wheels, each wheel including a corresponding wheel speed sensor and brake, wherein when velocity data from at least one wheel speed sensor is lost, velocity data from a wheel speed sensor coupled to a different wheel is used as the wheel speed for the wheel with the non-operational sensor.

Abstract: An electronic system to operate an electromechanical parking brake for a land vehicle comprises at least one input unit to detect a driver request for parking brake and at least two control units in connection with the input unit to evaluate the driver request for parking brake transmitted thereto. The control units are in connection with at least one actuator for activating the parking brake, in order to control said actuator. In addition, the system comprises an energy supply to feed the input unit, and the control units of the at least one actuator. On occurrence of a single fault from a set of possible fault states in the system, at least one control unit and at least one actuator are supplied with energy and/or control signals, the at least one control unit supplied controls the at least one actuator supplied so that the land vehicle is fixed in a parked position when a corresponding driver request for parking brake is present.

Abstract: A brake control system includes at least one wheel cylinder that receives the work fluid to apply a braking force to a corresponding vehicle wheel, a wheel cylinder pressure control system that controls the control pressure applied to the at least one wheel cylinder by controlling the supply of the work fluid thereto, a first abnormality determination unit that determines whether an abnormality in the wheel cylinder pressure control system based on an initial response characteristic of the control pressure after a braking request within a predetermined abnormality determination time, and a second abnormality determination unit that determines whether the abnormality in the wheel cylinder pressure system is present based on a comparison between the control pressure and a reference pressure based on which the determination is made with respect to the abnormality within a predetermined second abnormality determination time that is set to expire before expiration of the first abnormality determination time.

Abstract: A system and method for monitoring the usage of brake members of an aircraft braking system. The system makes a separate record of each brake actuation in which there is relative movement of the brake member's facing friction surfaces which causes wear, determines the types of brake usage and operates a pricing/payment scheme to charge for brake usage.

Abstract: A brake control apparatus comprises: a braking force applying mechanism that brakes a wheel by pressing a friction member upon supply of a working fluid; and a control portion that computes a target value set for controlling the pressure of the working fluid by utilizing a detected temperature of the friction member so as to restrain fluctuations of the effect of the brake caused by temperature changes of the friction member. The control portion restricts the utilization of the detected temperature in the computation of the target value in case a decline of the detection accuracy of the friction member temperature is predicted to restrain the influence of the decline of the estimation accuracy of the friction member temperature on the braking force control.

Abstract: A method of generating braking information for a device including first and second sensors linked to a control unit and designed to sense positioning information concerning a brake pedal moving between released and depressed positions. The method includes transmitting to the control unit, by the first sensor, a first pedal “press” signal and a first “non-press” signal, and transmitting to the control unit, by the second sensor, a second pedal “press” signal and a second “non-press” signal. The method also includes the generation of a first information signal if the first pedal “press” signal and first “non-press” signal are inconsistent and a second information signal if the second pedal “press” signal and the second “non-press” signal are inconsistent, each signal being analyzed independently of the other for this generation.

Abstract: An electrically powered brake system capable of performing a self-diagnosis of elements of the electrically brake system to diagnose a failure before a vehicle is driven is provided. The electrically powered brake system having a parking brake having a conversion mechanism 6 converting a rotary motion of a motor 2 into a linear motion, propelling a piston 7 according to the rotation of a rotor 2A of the motor 2 by the conversion mechanism, pressing brake pads 3 and 4 against a disc rotor 5 by the piston to generate a braking force, and retaining the braking force by a locking mechanism 10 has a control unit 20 performing a diagnosis of elements constituting the system during actuation of the parking brake. The control unit performs a diagnosis of a fail safe relay 26 receiving the supply of electric power of the motor, and performs diagnoses of a braking force sensor 8, a rotation angle detecting sensor 9 and a current sensor.

Abstract: A method for compensating a regenerative braking amount when regenerative braking of a vehicle fails due to an error in controller area network (CAN) communications between an electronic brake system (EBS) and a hybrid control unit (HCU). The method includes steps of determining whether or not the regenerative braking is activated, remembering a regenerative braking control amount in the HCU and the EBS, learning and remembering a difference between the regenerative braking control amount in a normal state calculated just before the failure and the braking amount for the failure check in the HCU and the EBS, compensating the braking amount for the failure check with the difference value between the normal regenerative braking control amount and the braking amount for the failure check, and performing a regenerative braking control in the HCU and the EBS respectively.

Abstract: A system and method for monitoring the usage of brake members of an aircraft braking system. The system makes a separate record of each brake actuation in which there is relative movement of the brake member's facing friction surfaces which causes wear, determines the types of brake usage and operates a pricing/payment scheme to charge for brake usage.

Abstract: A system and method for monitoring the applications of carbon-carbon brakes of an aircraft to determine brake condition and operate a brake maintenance program or charge a brake system user. The system and method includes monitoring each actuation of the brakes and making a separate record of each actuation of the brakes in which there is relative movement of the facing friction surfaces that cause wear, and from that separate record determining brake usage. The monitoring may include measuring changes and processing the signals to distinguish between those which fall below and those which are above a threshold value. The method and system may comprise sensing a plurality of braking parameters having values dependent upon the wear in the system and different faults of the system, and identifying and recording wear and faults based on combinations of values of the parameters.

Abstract: A method is provided for adjusting the play between the brake linings and the brake disc of a pneumatically actuated disc brake by way of at least one or several adjustment devices actuated by electric motors. The method sensorlessly determines the play caused by braking with the aid of a computer by use of a computer prognosis, wherein the prognosis includes wear caused by braking and the brake component variations in time produced by energy released by the braking, and the thus determined variations are adjusted at predetermined time intervals on at least one adjustment device by a corresponding adjustment process.

Abstract: A method and apparatus for data interchange between a tractor vehicle and a trailer vehicle coupled thereto. A first electronic device provided in or on the tractor is connected via a data link to a second electronic device provided in or on the trailer; the first and second devices being connected to sensors and/or actuators for controlling operating functions of the vehicle allocated thereto and for measuring status information. Initiated by an information request, the first device sends request data via the data link to the second device. The first device receives status information via the data link sent by the second device in response to the request data. The first device outputs, in a manner that correlates with the trailer, the received status information by means of an output device disposed on or in the tractor. The same output scheme is used for both the tractor and trailer.

Abstract: At least one of first and second actuator driving devices is supplied with electric power securely. When failure occurs in any one of main power line, auxiliary power line, first and second power supply lines and first and second relays, the first to third relays are controlled to be opened and closed so that failure part is separated or failure part is isolated from part where failure does not occur or supply of electric power to failure part is cut off or electric power is supplied to part to which electric power cannot be supplied.

Abstract: System and method for monitoring the applications of the brakes, e.g. of an aircraft to determine brake condition and operate a brake maintenance programme or charge a brake system user. It is desirable to have accurate information for determining the condition and predicting the life of carbon-carbon brake discs. This is important for safety as well as commercial reasons. The number of landings of an aircraft is often used as a determinant for such as lifetime warranties for brake discs and recommended maintenance periods. However, at least for carbon disc brakes, this may not be entirely accurate. For example such brake discs also wear during taxiing. The system and method herein includes monitoring each actuation of the brakes and making a separate record of each actuation of the brakes in which there is relative movement of the facing friction surfaces that cause wear, and from that separate record determining brake usage.

Abstract: The present invention describes an electronic circuit arrangement with a motor vehicle control adapted to be activated by a current/voltage supply, wherein the motor vehicle control or the current/voltage supply for the motor vehicle control is connected to an activation unit for the independent activation of the motor vehicle control, and the motor vehicle control can be switched on or off by the activation unit, and it also describes the use thereof for the control and/or monitoring of electronic or electrohydraulic brake systems. Also described is a system wherein leakage of a pressure reservoir is monitored and the pressure reservoir is replenished by means of a filling device as soon as the pressure drops below a defined limit value during the temporally limited activation.

Abstract: The present invention includes a method for controlling brake motor. The method includes receiving brake motor information, determining a first brake motor voltage value and a brake motor current value based on the motor information when the brake motor is active, determining a brake motor resistance value based on the first brake motor voltage value and the brake motor current value, determining a brake motor temperature value based on the determined brake motor resistance value, and producing a brake motor control signal based on the determined brake motor temperature value. The method may additionally include determining a second brake motor voltage value when the brake motor is inactive, and producing a motor diagnostic voltage value based on the determined second brake motor voltage value.

Abstract: When the increasing gradient of the operating power is larger than a predetermined gradient, if a master pressure PM2 corresponding to a second predetermined operating power F2 is larger than a second predetermined fluid pressure Pth2, a servo function failure in the brake operation is determined; if it is smaller than the second predetermined fluid pressure Pth2, fluid leakage failure (S23, S26, S27) is determined. Furthermore, if the master pressure PM0 corresponding to the first predetermined operating power F0 is larger than a first predetermined fluid pressure Pth1, small amount fluid leakage failure is determined; if it is smaller than the first predetermined fluid pressure Pth1, large amount fluid leakage failure (S28, S29, S30) is determined.

Abstract: Systems and methods for detecting degradation of a sensor in a vacuum brake booster coupled to a manifold of an internal combustion engine include measuring an engine or vehicle operating parameter to detect operating or control conditions and detecting degradation of the sensor based on the engine or vehicle operating parameter. In one embodiment the operating parameter is a measured or estimated manifold pressure. A pressure drop across a check valve disposed between the brake booster and the intake manifold may also be considered.