摘要:
Methods and systems are provided for assessing a vehicle transmission having a resolver. A memory is configured to store preliminary data pertaining to an error of the resolver. A processor is coupled to the memory, and is configured to determine a harmonic characteristic of the preliminary data, and to assess the vehicle transmission using the harmonic characteristic.
摘要:
A method for operating a motor vehicle with an automated gearbox (1), which can be connected, via a clutch (2), to a prime mover (3). The output rotational speed of the gearbox (1) is detected by sensors and evaluated for plausibility by comparison with an arithmetic mean value of sensor-detected rotational speeds of the rear wheels (7, 8) of the motor vehicle. It is also possible to determine plausibility, using the arithmetic mean of the sensor-detected rotational speeds of the front wheels (9, 10), in case of a failure of at least one of both generated signals (20, 21) of the rotational speed sensors (18, 19) of the rear wheels (7, 8) for checking the plausibility of the output rotational speed of the gearbox (1).
摘要:
A method is for making a diagnosis as to signal plausibility in a speed sensor of a motor vehicle. In the method, the speed sensor outputs a pulse sequence to an evaluation circuit in dependence upon the speed of the vehicle and, in a steady-state operating condition of the motor vehicle, a ratio is formed between the determined speed and an engine rpm and the ratio is averaged over a pregiven time. A plausibility is determined only when the formed mean value lies in a value range permissible for the steady-state operating condition.
摘要:
An automatic transmission control system having a fail-safe function includes an automatic transmission control unit which prestores a normal state of ON-OFF settings of engaging elements and actually detects an actual state of ON-OFF positions (engagements and disengagements) of the engaging elements. The automatic transmission control unit has a comparator capable of comparing the normal state of ON-OFF settings with the actual state of ON-OFF positions of the engaging elements, and determines that a hydraulic system failure occurs when the normal state and the actual state disagree with each other. The automatic transmission control unit has a fail-safe mode engagement-disengagement command section provided for selecting a specified gear mode based on the actual state and for outputting a command to an actuator for the engaging elements, so that the transmission is shifted to the specified gear mode which is preprogrammed to be suitable for the actual state, only when the automatic transmission control unit determines that the hydraulic system failure occurs.
摘要:
The present disclosure provides a method for preventing interlock of a transmission. The method may include: sensing, with a controller, target currents of a plurality of solenoid valves, where each solenoid valve of the plurality of solenoid valves is connected to corresponding friction element; and when it is determined that target currents of at least two solenoid valves of the plurality of solenoid valves are equal to or greater than a predetermined current, interrupting, with the controller, a supply of power to the plurality of solenoid valves based on a degree of deviation of an actual speed of a transmission output shaft from a target speed for a predetermined time.
摘要:
A method of controlling a continuously variable transmission for a vehicle. The continuously variable transmission has a hydrostat with a position-regulating valve and is designed to co-operate in driving connection with a drive input shaft and a drive output shaft such that when the position-regulating valve is energized, the hydrostat is adjusted to accelerate the vehicle. The method includes monitoring the energization of the position-regulating valve cyclically by a safety function. The safety function is provided in order to recognize undesired energization of the position-regulating valve that leads to unwanted acceleration of the vehicle, and then to separate the transmission at least from the drive output shaft so as to prevent unwanted acceleration of the vehicle. The safety function is triggered at least when a limit value for the energization of the position-regulating valve is exceeded.
摘要:
A fault determination system of a button-type shifter is provided. The system maximally guarantees the operation of a shift button while determining a failure of the shift button and improves reliability and fault diagnosis performance for the shift button. The system includes a base that is installed within a vehicle and includes shift buttons and contact points for each of the shift buttons. A controller receives contact signals from the contact points to thus determine a failure of the shift button when any one of the contact points is not sensed or is stuck when the shift button is engaged.
摘要:
A fault determination system of a button-type shifter is provided. The system maximally guarantees the operation of a shift button while determining a failure of the shift button and improves reliability and fault diagnosis performance for the shift button. The system includes a base that is installed within a vehicle and includes shift buttons and contact points for each of the shift buttons. A controller receives contact signals from the contact points to thus determine a failure of the shift button when any one of the contact points is not sensed or is stuck when the shift button is engaged.
摘要:
Oil pressure is produced by an electrical pump during an engine operation is temporarily stopped according to an idling-stop function and respectively supplied to multiple electromagnetic valves. A command value for a drive current is supplied to each of a driver circuit in order to adjust the oil pressure to be outputted from the corresponding electromagnetic valve. Such adjusted oil pressure is applied to a corresponding gear-change element and an oil-pressure a detecting device detects the oil pressure applied to the gear-change element to obtain detection value for the oil pressure. A current-command characteristic for each of the electromagnetic valves is updated based on the command value of the drive current and the detection value of the oil pressure.
摘要:
Oil pressure is produced by an electrical pump during an engine operation is temporarily stopped according to an idling-stop function and respectively supplied to multiple electromagnetic valves. A command value for a drive current is supplied to each of a driver circuit in order to adjust the oil pressure to be outputted from the corresponding electromagnetic valve. Such adjusted oil pressure is applied to a corresponding gear-change element and an oil-pressure a detecting device detects the oil pressure applied to the gear-change element to obtain detection value for the oil pressure. A current-command characteristic for each of the electromagnetic valves is updated based on the command value of the drive current and the detection value of the oil pressure.