Abstract: An in-vehicle device is an in-vehicle device including a control unit configured to obtain an update program transmitted from an external server outside a vehicle and to perform processing for updating a program of an in-vehicle ECU mounted in the vehicle, wherein the control unit obtains an update program to be applied to the in-vehicle device from the external server, selects, as a substitute ECU, one in-vehicle ECU whose program is not an update target among a plurality of in-vehicle ECUs mounted in the vehicle, and performs activation processing for applying the obtained update program to the in-vehicle device in response to an activation instruction from the selected substitute ECU.

Abstract: A lock determination device for variable valve timing mechanism includes means for detecting an operating position of a variable valve timing mechanism having a function of locking a valve timing of an internal combustion engine in an intermediate position between a most retarded position where the valve timing is most retarded and a most advanced position where the valve timing is most advanced in stopping operation of the internal combustion engine, means for starting a timer when the operating position of the variable valve timing mechanism enters an intermediate region, the intermediate region being a predetermined region including the intermediate position, means for determining whether or not the operating position of the variable valve timing mechanism is in a determination holding region wider on a retardation side than the intermediate region after the timer is started, means for incrementing a value of the timer if the operating position of the variable valve timing mechanism is in the determination

Abstract: A lock determination device for variable valve timing mechanism includes means for detecting an operating position of a variable valve timing mechanism having a function of locking a valve timing of an internal combustion engine in an intermediate position between a most retarded position where the valve timing is most retarded and a most advanced position where the valve timing is most advanced in stopping operation of the internal combustion engine, means for starting a timer when the operating position of the variable valve timing mechanism enters an intermediate region, the intermediate region being a predetermined region including the intermediate position, means for determining whether or not the operating position of the variable valve timing mechanism is in a determination holding region wider on a retardation side than the intermediate region after the timer is started, means for incrementing a value of the timer if the operating position of the variable valve timing mechanism is in the determination

Abstract: When an intermediate lock by an intermediate lock mechanism is released, one of two lock keys, which restricts a shift in a direction opposite to a direction that valve timing of an intake valve has been controlled by controlling the valve timing of the intake valve to a phase-advance side with respect to an intermediate lock position, is pulled out of an engaging recessed portion. Thereafter, the other of the two lock keys is pulled out of an engaging recessed portion by controlling the valve timing of the intake valve to a phase-retard side with respect to the intermediate lock position. Therefore, the intermediate lock by the intermediate lock mechanism can be released, while avoiding the lock keys from being pushed against the respective engaging recessed portions.

Abstract: Intermediate position feedback control is executed when valve timing of an intake valve is at an intermediate lock position, an intermediate lock is needed, and an engine revolution speed is greater than a first engine revolution speed R1. Forced lock control is executed when the valve timing of the intake valve is at the intermediate lock position, the intermediate lock is needed, the engine revolution speed is less than the first engine revolution speed R1, and the intermediate position feedback control is not being executed. As a result, even when the engine revolution speed increases in the presence of a demand that the valve timing needs to be in the intermediate lock position, it is possible to maintain the valve timing at the intermediate lock position.

Abstract: To achieve an intermediate lock state in a short period when an engine is stopped and improve the accuracy of confirmation of the intermediate lock state, an engine valve timing control apparatus includes a variable valve timing mechanism configured to vary engine valve timing, and an intermediate lock mechanism configured to restrict relative rotation positions of a first and a second rotor of the valve timing mechanism at an intermediate lock position for starting the engine. Upon detection of an engine stop request, the valve timing mechanism and the intermediate lock mechanism are driven and controlled for establishing an intermediate lock state. When a predetermined period from detection of the engine stop request has expired without detecting the intermediate lock state within the predetermined period, an engine stopping process is executed. Even after the engine stopping process has been executed, monitoring of the intermediate lock state is continued.

Abstract: Intermediate position feedback control is executed when valve timing of an intake valve is at an intermediate lock position, an intermediate lock is needed, and an engine revolution speed is greater than a first engine revolution speed R1. Forced lock control is executed when the valve timing of the intake valve is at the intermediate lock position, the intermediate lock is needed, the engine revolution speed is less than the first engine revolution speed R1, and the intermediate position feedback control is not being executed. As a result, even when the engine revolution speed increases in the presence of a demand that the valve timing needs to be in the intermediate lock position, it is possible to maintain the valve timing at the intermediate lock position.

Abstract: When an intermediate lock by an intermediate lock mechanism is released, one of two lock keys, which restricts a shift in a direction opposite to a direction that valve timing of an intake valve has been controlled by controlling the valve timing of the intake valve to a phase-advance side with respect to an intermediate lock position, is pulled out of an engaging recessed portion. Thereafter, the other of the two lock keys is pulled out of an engaging recessed portion by controlling the valve timing of the intake valve to a phase-retard side with respect to the intermediate lock position. Therefore, the intermediate lock by the intermediate lock mechanism can be released, while avoiding the lock keys from being pushed against the respective engaging recessed portions.

Abstract: To achieve an intermediate lock state in a short period when an engine is stopped and improve the accuracy of confirmation of the intermediate lock state, an engine valve timing control apparatus includes a variable valve timing mechanism configured to vary engine valve timing, and an intermediate lock mechanism configured to restrict relative rotation positions of a first and a second rotor of the valve timing mechanism at an intermediate lock position for starting the engine. Upon detection of an engine stop request, the valve timing mechanism and the intermediate lock mechanism are driven and controlled for establishing an intermediate lock state. When a predetermined period from detection of the engine stop request has expired without detecting the intermediate lock state within the predetermined period, an engine stopping process is executed. Even after the engine stopping process has been executed, monitoring of the intermediate lock state is continued.

Abstract: A float chamber is defined within a body, which is also formed with an inlet passage for supplying fluid into the float chamber, and an outlet passage for taking fluid out from the float chamber opening into a lower part of the float chamber. A float is mounted within the float chamber so as to be movable up and down, and acts on a fluid valve for controlling fluid flow into the float chamber through the intake passage, causing the valve to open and close. The shapes of the float and the float chamber are such that the amount of fluid required to be present in the float chamber in order to float the float at the position in which it just causes the valve to be closed, in equilibrium between its weight and the buoyancy force exerted by the fluid, is independent of the angle of tilting of the float chamber within a certain tilting range.

Abstract: A carburetor having an accelerator pump for pushing fuel contained in the chamber of the pump into an air intake passageway of the carburetor by means of an accelerating pump piston during acceleration, a second pump chamber being expandable and contractable and communicating with the pump chamber via a throttle and a pressure control means for constantly applying pressure to said second pump chamber in a direction whereby the second pump chamber is allowed to expand only when fuel pressure in the second pump chamber exceeds a predetermined value.

Abstract: A secondary air supply control system including: an air cleaner; an air pump connected to the air cleaner; a valve having a first chamber and a second chamber, which are separated by a diaphragm and communicated with each other through a first orifice, and controlling the supply of secondary air from the air pump to an exhaust manifold, in response to deflection of the diaphragm; and a passage connecting the second chamber to an intake manifold in a position downstream of a throttle valve in a carburetor and having a second orifice. In addition, a check valve which allows the flow of the secondary air only in the direction towards the exhaust manifold is provided in a passage interconnecting the valve and the exhaust manifold. In this system, an open cross-sectional area of the first orifice is smaller than that of the second orifice provided in the aforesaid passage.

Abstract: This discloses an ignition-timing adjusting system for internal combustion engines, which realizes an advance of the ignition-timing relating to the temperature of an engine. This system comprises vacuum advance means responsive to a vacuum produced by the vacuum in the intake tube of the engine for advancing the ignition timing of the engine, and means for controlling the level of said vacuum produced by said intake-tube vacuum with relation to the temperature of the engine. When the engine is cold, the ignition-timing is advanced under control of said vacuum-level controlling means to the proper position for operation of the cold engine.