Abstract:
A method is provided for estimating cylinder air charge in an internal combustion engine, such engine having a mass airflow (MAF) sensor and a manifold absolute pressure (MAP) sensor. The method provides such cylinder air charge estimation from signals produced primarily by the manifold absolute pressure sensor during engine transient conditions. During a transition period between the transient condition and a steady-state engine condition the method combines signals primarily from both the mass airflow sensor and the manifold absolute pressure sensor to provide such cylinder air charge estimation. During the steady-state condition, the method uses primarily only the mass airflow sensor to provide such cylinder air charge estimation. With such method, the cylinder air charge estimation method utilizes the advantages of both measurement sensors. When transient situation occurs, the engine controller utilizes measurements from MAP sensors (together with measurements from other less significant sensors) to produce the cylinder air charge estimation. When it is determined that the transient situation is converging to a steady state operation, a smoothing algorithm is employed to combine the measurements from both MAF and MAP sensors to produce the cylinder air charge estimation. Finally, when the engine is operating in steady state, only the MAF sensor (together with other less significant sensors) is used to produce the cylinder air charge estimation.
Abstract:
A crash assessment and safety device activation system includes a target object potentially colliding with a host object in motion, is disclosed. A remote sensor is coupled to the host object and adapted to detect a target object within a region sensed thereby and generate an object signal from the target object. A visual sensor is adapted to sense the region sensed by the remote sensor and therefrom generate a visual signal. A safety device actuator is coupled to the host object and adapted to activate a safety device. A controller is attached to the host object, the remote sensor, the visual sensor and the safety device actuator. The control is adapted to assess collision threat from the remote sensor signal and confirm the presence of the target object with the vision sensor. The controller is further adapted to control the safety device actuator in response said threat assessment.
Abstract:
A strategy to control and diagnose the operation of an electric motor using a sensorless control system augmented by feedback from a position and speed sensor is disclosed. The strategy can improve the robustness of operation and diagnose potential faults in electric motors. The present invention includes a method for diagnosing operation of an electric motor and a method and system for controlling an electric motor. In the diagnostic method, a sensorless system and a sensor based system are checked against each other to determine if either of the systems is faulted. In the control method, the sensor based control system is used when the motor speed is below a predetermined threshold and the sensorless system is used when the motor speed is above the predetermined threshold. The position sensor can be a low resolution position sensor, an engine crankshaft sensor, an engine camshaft sensor, or a transmission sensor.
Abstract:
A windshield washer system for an automotive vehicle includes a reservoir for holding windshield washer fluid, and an applicator system for furnishing washer fluid from the reservoir to an exterior surface of the vehicle. A heat transfer system recovers heat from a braking system of the vehicle and conveys the recovered heat to the washer fluid contained within the reservoir.
Abstract:
A method for determining the use of a block heater in an internal combustion engine and compensating for the effects that such heaters can have on an engine coolant sensor. The method uses measurements of ambient air temperature to determine if the use of a heater is likely and then compares the measured coolant temperature with an inferred coolant temperature to verify the usage of the block heater when the difference is significant. When use of a heater is detected, the value for coolant temperature initially supplied to the engine control system is compensated with a normalized coolant temperature value that is based on a functional relationship between the inferred engine temperature and the measured coolant temperature. Then as the mechanism of the engine begins to mechanically turn and the coolant is circulated, the normalized value of coolant temperature is filtered in a way that the normalized value approaches the temperature reading from the coolant sensor, as the starting process continues.
Abstract:
A diesel engine emission control system uses an upstream oxidation catalyst and a downstream SCR catalyst to reduce NOx in a lean exhaust gas environment. The engine and upstream oxidation catalyst are configured to provide approximately a 1:1 ratio of NO to NO2 entering the downstream catalyst. In this way, the downstream catalyst is insensitive to sulfur contamination, and also has improved overall catalyst NOx conversion efficiency. Degradation of the system is determined when the ratio provided is no longer near the desired 1:1 ratio. This condition is detected using measurements of engine operating conditions such as from a NOx sensor located downstream of the catalysts. Finally, control action to adjust an injected amount of reductant in the exhaust gas based on the actual NO to NO2 ratio upstream of the SCR catalyst and downstream of the oxidation catalyst.
Abstract:
A virtual reality assembly 10 is provided, including a display element 12 projecting a virtual environment 16, and a plurality of way-point elements 20 each defined by its own way-point position 22. A user 18 can automatically move to one of said way-point positions 22 by simply selecting the corresponding way-point element 20.
Abstract:
A method and system for freeze protecting liquid NOx reductants, preferably used in vehicle applications, wherein a liquid NOx reductant, carried onboard a vehicle exposed to cold weather conditions, is heated by existing thermal energy generated by fuel compression. The heated fuel heats a potentially frozen reductant and the liquid reductant is supplied to an exhaust gas pipe in front of a catalyst for reducing NOx on the surface of the catalyst and catalytically converted into environmentally safe nitrogen and water.
Abstract:
A method for rapidly heating an emission control device in an engine exhaust uses excess air added to the exhaust via an air introduction device. After an engine cold start, the engine is operated to raise exhaust manifold temperature to a first predetermined value by operating the engine with a lean air-fuel ratio and retarded ignition timing. Once the exhaust manifold reaches the predetermined temperature value, the engine is switched to operate rich and air is added via the air introduction device. The added air and rich exhaust gas burn in the exhaust, thereby generating heat and raising catalyst temperature even more rapidly. The rich operation and excess air are continued until either engine airflow increases beyond a pre-selected value, or the emission control device reaches a desired temperature value. After the emission control device reaches the desired temperature, the engine is operated substantially around stoichiometry. Further, a method is described for adaptively learning pump airflow using feedback from an exhaust gas oxygen sensor.
Abstract:
An oil cooler for a vehicle with an automatic transmission that includes a core contained between two end pipes. A first one of the end pipes includes an oil inlet, for directing oil from the transmission, and an oil outlet, directing oil back to the transmission, and a dividing plate having a flow control orifice. An oil filter is positioned around the flow control orifice to filter the oil flowing through the orifice, thereby removing contaminants from the oil, while the oil flowing through the core is cooled.