The present disclosure relates to a wheel speed sensor system (1), comprising: one or more first wheel speed sensors (2a, 2b), a first application specific integrated circuit (ASIC) (4) configured to receive one or more first wheel speed signals from the one or more first wheel speed sensors (2a, 2b) and to convert the one or more first wheel speed signals to first wheel speed data, and a first electronic control unit (ECU) (6) configured to receive the first wheel speed data from the first ASIC (4) via a data link (8) between the first ECU (6) and the first ASIC (4); and one or more second wheel speed sensors (3a, 3b), a second ASIC (5) configured to receive one or more second wheel speed signals from the one or more second wheel speed sensors (3a, 3b) and to convert the one or more second wheel speed signals to second wheel speed data, and a second ECU (7) configured to receive the second wheel speed data from the second ASIC (5) via a data link (9) between the second ECU (7) and the second ASIC (5). The first ECU (6) is further configured to receive the second wheel speed data from the second ASIC (5) via a data link (13) between the first ECU (6) and the second ASIC (5), and the second ECU (7) is further configured to receive the first wheel speed data from the first ASIC (4) via a data link (14) between the second ECU (7) and the first ASIC (4). The present disclosure further relates to a vehicle including said wheel speed sensor system and to a method of processing wheel speed signals.

A vehicle wheel hub assembly includes an outer member configured to be mounted to a non-rotatable portion of the vehicle and an inner member rotatably supported in the outer member by a bearing and configured to support a vehicle wheel. A first target member is coupled with the inner member, and a first sensor is fixed to the outer member and positioned to sense an angular displacement of the first target member relative to the outer member and to produce a first output signal. A second target member is coupled with the inner member and is spaced axially from the first target member, and a second sensor is fixed to the outer member and positioned to sense an angular displacement of the second target member relative to the outer member and to produce a second output signal.

A wheel speed sensor system for determining the rotational speed of the wheels mounted at the opposite ends of an axle without requiring wheel speed sensor assemblies for each wheel shaft axle. As a result, the speed sensor system of the present disclosure can be housed in small sized or small capacity axle housing such as banjo type housings. In one embodiment, a wheel speed sensor assembly is positioned in the axle housing to determine the speed of one of the wheel axle shafts and a differential speed sensor assembly is positioned in the axle housing to determine the rotational speed of the differential. With these two speed measurements the rotational speed of the other wheel axle shaft can be calculated by a control unit. The wheel and differential speed sensor assemblies can each include a toothed or slotted ring or disk and sensor for sensing the teeth. In each of the wheel and differential speed sensor assemblies, one of the tone ring and sensor can be mounted for rotation with a wheel axle shaft and gear of the differential respectively and the other can be fixedly mounted. The sensors can detect the passage of teeth over time via the relative motion of the teeth and sensor to determine rotational speed.

The present disclosure provides a system and a method for controlling kick-back in an electric booster type brake system capable of reducing a kick-back phenomenon in which a hitting force is transmitted to a brake pedal due to a difference between a high braking hydraulic pressure already generated in a power piston of a second master cylinder by driving a motor and a low braking hydraulic pressure generated in a first master cylinder when a driver steps on a brake pedal, in a fall back situation in which electric power is not smoothly supplied to the motor due to a low voltage of a battery.

Disclosed is a method for operating a rotational speed sensor comprising a sensor element in a vehicle, wherein the sensor element interacts with a magnet wheel on a wheel of the vehicle and an effective parameter generated by the interaction of the magnet wheel with the sensor element is evaluated in the form of a measurand in an evaluation module and, depending on the measurand, an output variable characterizing the rotational speed of the wheel is output, wherein the sensor element is supplied via the evaluation module with a sensor voltage influencing the measurand. A sensor assembly is also disclosed.

A wheel speed sensor includes a housing having a longitudinal axis. The housing receives a speed measurement instrument and faces an exciter ring upon insertion into an opening in a sensor mounting block spaced from the excite ring such that the instrument senses rotation of the exciter ring. A plurality of springs are mounted in the housing and project radially outwardly therefrom with at least a subset of the springs engaging a surface of the opening in the sensor mounting block. Each spring has first and second ends over molded by the housing and an intermediate section between the first and second ends spaced from a radially outer surface of the housing.

Detectable indicia are provided on the interior circumferential rim of the brake hub-drum adjacent to, and spaced apart from, the backing plate of the brake. A sensor is mounted on the backing plate to detect wheel speed and/or other operating conditions detectable from the motion and/or relative location or condition of those indicia. The number of indicia used and the indicia spacing along the interior circumferential rim is selected as needed for a given type of sensor and/or a given application. In the case of a speed sensor, the indicia can be a series of notches in the rim along the entire interior circumferential rim, resembling a series of teeth into that rim. The width of those teeth can be formed wide enough to accommodate movement of the hub-drum relative to the backing plate and/or the sensor, without loss of system functionality, according to the sensing tolerances of a given sensor being used in a given application.

A system includes a magnetic sense element for detecting an external magnetic field and a magnetic field source proximate the magnetic sense element for providing an internal magnetic field that is detectable by the magnetic sense element. The system selectively functions in-situ in either of an operational mode and a standstill mode. The magnetic sense elements detects the external magnetic field in the operational mode. The external magnetic field is not available for detection in the standstill mode, and the internal magnetic field is provided only when the system is in the standstill mode. The system further includes a processing circuit that processes an output signal produced by the magnetic sense element in response to the internal magnetic field to determine operability of the system and to detect failures within the entire signal processing chain.

The present disclosure provides a system and a method for controlling kick-back in an electric booster type brake system capable of reducing a kick-back phenomenon in which a hitting force is transmitted to a brake pedal due to a difference between a high braking hydraulic pressure already generated in a power piston of a second master cylinder by driving a motor and a low braking hydraulic pressure generated in a first master cylinder when a driver steps on a brake pedal, in a fall back situation in which electric power is not smoothly supplied to the motor due to a low voltage of a battery.

Example apparatus are disclosed for a wheel-speed tone ring apparatus. An example apparatus includes an axle of a vehicle, and a tone ring coupled to the axle, the tone ring having teeth distributed about a peripheral edge of the tone ring, each tooth having a ramp-shaped surface to be sensed by a wheel speed sensor as the tone ring rotates with the axle.