摘要:
A apparatus and method of detecting a leak in an evaporative emissions system measures vapor flow out of the evaporative emissions system while maintaining a zero pressure difference from inside a fuel tank to atmosphere and provides a reference vapor flow variable dependent on the measurement (317). A pressurized vapor and leak flow variable is measured (323) dependent on measured vapor flow out of the evaporative emissions system while maintaining a pressure difference of 10" of water from inside the fuel tank to atmosphere. A leak is indicated (327) if a difference between the reference vapor flow variable and the pressurized vapor and leak flow variable is greater than a predetermined leak flow factor.
摘要:
A method, and a corresponding system, for determining misfire in a reciprocating engine measures engine crankshaft angular velocity and provides an angular velocity signal as measured from the engine crankshaft (403). A filtered acceleration signal, dependent on the engine crankshaft angular velocity signal and independent of normal combustion information and other high-order effects is provided via filtering (405). When the filtered acceleration signal exceeds a threshold dependent on at least one of the following; engine speed, engine load, or engine temperature (711), a misfire is indicated. Preferably, prior to the misfire determination, the filtered acceleration signal (701) is sampled over a first period of engine crankshaft rotation to provide a first data point (703), over a second period of engine crankshaft rotation to provide a second data point (707), and over a third period of engine crankshaft rotation to provide a third data point (705). Then, an average of the first and third data points is subtracted from the second data point and a combined acceleration signal is provided (511). Then, a misfire is indicated (517) when the combined acceleration signal exceeds the threshold (513). Preferably, this sampling of the filtered acceleration signal is continuous, and the sampling of the first, second and third data points is separated by two engine crankshaft rotations.
摘要:
A misfire detection method and apparatus includes measurement of combustion induced torque in an internal combustion engine and provision of time-ordered first, second, and third acceleration data samples dependent on the torque. A misfire is indicated when a magnitude of the second acceleration data sample has a magnitude less than a misfire threshold, and less than a magnitude of both the first and third acceleration data samples.
摘要:
An internal combustion engine is provided having a luminosity detector and an arrangement for adjusting the parameters of the engine in response to sensed combustion conditions within the combustion chamber based on particular gain independent parameters of the luminosity signal. The gain independent luminosity parameters can also be used to obtain uniform combustion conditions from cycle to cycle in a given combustion chamber and uniform combustion in the combustion chambers of multi chamber engine.
摘要:
A method and system of combustion control for an internal combustion engine (313) proximate an extinction limit includes measurement of acceleration behavior of the internal combustion engine and providing a measure of combustion variability dependent thereon. Preferably, the combustion variability measure is derived by one or more stochastically based methods (607). Operation of the internal combustion engine (313) is controlled dependent on the combustion variability measurement. Fuel, ignition, and exhaust gas recirculation may all be controlled by the derived combustion variability measurement to significantly reduce hydrocarbon (HC) and NO.sub.x emissions.
摘要:
An internal combustion engine is provided having a luminosity detector and an arrangement for measuring certain parameters and running conditions of the engine such as air/fuel ratio in response to sensed combustion conditions within the combustion chamber based on particular gain independent parameters of the luminosity signal and selected engine parameters such as speed. The gain independent luminosity parameters can also be used in an engine control loop to ajust the various parameters of the engine like air/fuel ratio so as to obtain the desired luminosity characteristics and to obtain better running of the engine.
摘要:
A vehicle network and method for communicating information within a vehicle. The network includes a plurality of network elements joined by communication links. A data frame is provided for communicating information between a first device and a second device attached to the network. A network element in the network is capable of mapping a first resource on an incoming communication link of the network element to a second link resource of an outgoing communication link of the network element. The network element further has ports for receiving the data frame from the first link resource of the incoming communication link and for communicating the data frame to the second link resource of the outgoing communication link. The mapping may be done statically or dynamically such as based on information stored in the network element or based on information stored in the data frame.
摘要:
Disclosed herein are a variety of different electrical system topologies intended to mitigate the impact of large intermittent loads on a 12 volt vehicle power distribution system. In some embodiments the intermittent load is disconnected from the remainder of the system and the voltage supplied to this load is allowed to fluctuate. In other embodiments, the voltage to critical loads is regulated independently of the voltage supplied to the remainder of the system. The different topologies described can be grouped into three categories, each corresponding to a different solution technique. One approach is to regulate the voltage to the critical loads. A second approach is to isolate the intermittent load that causes the drop in system voltage. The third approach is to use a different type of alternator that has a faster response than the conventional Lundell wound field machine.
摘要:
A clutch (22) includes a first member (48) rotatable with respect to a base member (14) in a first direction A and a second direction B, a second member (56) rotatable with respect to the base member, a rolling element (62) between the first and second members, and a ramp sleeve (58) disposed between the first and second members, and coupled to the base member such that the ramp sleeve is generally prevented from rotating with respect to the base member. The ramp sleeve includes a ramp (82). The second member includes a first rotational position with respect to the ramp sleeve and a second rotational position with respect to the ramp sleeve. The rolling element is configured to wedge against the ramp to prevent relative rotation of the first member with respect to the base member in the first direction when the second member is in the first rotational position. When the second member is in the second rotational position, the first member is able to rotate with respect to the base member in the first rotational direction.
摘要:
A drive axle system for a vehicle drive train having a clutching device is provided. The drive axle system includes a first shaft, a first axle assembly, a second axle assembly, a first clutching device, and a second clutching device. The first axle assembly is drivingly engaged with the first shaft through a first pinion gear. The first clutching device divides one of a pair of output axles into first and second portions. The second clutching device selectively engages a driving gear of the second axle assembly with a second pinion gear of the first axle assembly through a propeller shaft.