摘要:
A method for controlling an engine to reduce vehicle shuffle mode vibration during mode transition. The engine includes multiple cylinders, each with at least one electrically actuated valve, and the engine operates in a first mode having a first number of firing cylinders and a second mode having a second number of firing cylinders. The method comprises transitioning the engine from operating in the first mode to the second mode; adjusting at least a valve timing or lift of one of a last cylinder to be fired in said first mode and a first cylinder to be fired in said second mode to temporarily adjust a cylinder torque and thereby reduce vehicle shuffle mode vibration.
摘要:
A system for communicating information between a first controller and a second controller is presented. The system is designed to improve and increase the robustness data transferred between two controllers.
摘要:
An electronic valve actuation system and control method is described. The valve timing is changed between early and late intake valve closing depending on engine operating conditions. Further, valve timing is adjusted to control engine airflow or engine torque. Finally, air-fuel ratio is adjusted based on feedback from an exhaust gas oxygen sensor as well as an estimate of air, fuel, and residual exhausted from cylinders operating with late valve closing (after bottom dead center) timing.
摘要:
A system (12) and method for controlling an armature (20) of an electromagnetic actuator (10) are provided. The system (12) includes a circuit (46) for providing current to the coils (32, 34) of electromagnets (16, 18) disposed on either side of the armature (20). The system (12) also includes an electronic control unit (ECU) (50). The ECU (50) is configured to determine the neutral position of a virtual spring corresponding to the combination of forces acting on the armature 20 including the magnetic force of the attracting electromagnet (16 or 18) and the force of a restoring spring (22 or 24) opposing movement of the armature (20) towards the attracting electromagnet (16 or 18). The ECU (50) is further configured to control the current in the coil (32 or 34) of the attracting electromagnet (16 or 18) responsive to the determined neutral position so as to minimize the velocity of the armature as it reaches the pole face (36 or 38) of the attracting electromagnet (16 or 18).
摘要:
An engine control system and method wherein difference between an actual intake manifold pressure and a desired intake manifold pressure and a difference between an actual exhaust manifold pressure and a desired exhaust gas pressure are combined into a single feedback signal to control a variable geometry turbine. Simultaneously therewith, a difference between the actual intake manifold pressure and the desired intake manifold pressure is used to control throttle position.
摘要:
A control method and system are disclosed for managing torque during a transition in an internal combustion engine. Spark timing and unequal delivery of fuel to engine cylinders both impact torque and are used to provide smooth torque during a transition.
摘要:
A method of controlling the airflow into a compression ignition engine having an EGR and a VGT. The control strategy includes the steps of generating desired EGR and VGT turbine mass flow rates as a function of the desired and measured compressor mass airflow values and exhaust manifold pressure values. The desired compressor mass airflow and exhaust manifold pressure values are generated as a function of the operator-requested fueling rate and engine speed. The EGR and VGT turbine mass flow rates are then inverted to corresponding EGR and VGT actuator positions to achieve the desired compressor mass airflow rate and exhaust manifold pressure. The control strategy also includes a method of estimating the intake manifold pressure used in generating the EGR valve and VGT turbine positions.
摘要:
A vehicle drive system for adjusting vehicle fuel economy is described. In one example, the vehicle drive system includes an operator interface for adjusting vehicle operation so as to increase or decrease fuel consumption according to a driver preference.
摘要:
A vehicle drive system comprising of a variable displacement engine including a plurality of cylinders, where at least one of the plurality of cylinders selectively deactivates to decrease engine displacement; a torque converter operatively coupled to the variable displacement engine configured to operate with variable slip; a driver interface for receiving a preference setting from a driver; a control system for receiving the driver preference setting, and adjusting torque converter slip based on the driver preference setting.
摘要:
A method for calculating transient fuel wall wetting characteristics of an operating engine is described. The method accounts for cylinder valve deactivation of cylinders in the engine in calculating the dynamic fueling compensation. In one example, fuel vaporization effects from fuel puddles in deactivated cylinders are considered when calculating the fueling compensation for active cylinders.