摘要:
A motor car includes a body, an electrical supply, an electric drive unit, a steering system, a parking brake and a control unit inside the body for causing the drive unit to be activated by the electrical supply. The motor car also includes a control unit outside the body for operating the drive unit, the control unit constituting an external control for enabling parking manoeuvres in restricted spaces.
摘要:
A device for screwing to the floor from below, a mechanical part which has previously been placed against the underside of the floor of a motor vehicle body, provides for the mechanical part which is to be connected to be arranged so that at least one reference pin projects upwardly to engage a corresponding reference hole in a wall of the body floor from below. The reference pin has a through-hole. A sleeve with an upper end portion of smaller diameter is fixed to the upper side of the wall of the body floor, coaxially with the reference hole, and defines a threaded hole for engagement by a screw which can be inserted through the hole in the reference pin from beneath. The sleeve also includes a base portion of larger diameter for receiving the outer surface of the part of the reference pin which projects above the wall of the floor through the reference hole so as to allow the centering of the threaded hole which is to be engaged by the screw with the hole in the reference pin. When the mechanical part has to be connected to the floor with the interposition of a block of elastomeric material, the reference pin may be an integral part of the metal reinforcement of the block.
摘要:
A screwing device has means for measuring the tightening strain in a bolt and is of the type in which a support arm housing transmission members supports a screwing head by means of a transmission shaft connected to the transmission members, the screwing head being movable relative to the support arm and housing means, which are fixed relative to the arm, for supporting the measuring means.
摘要:
The idling speed of an internal combustion engine is regulated with the use of an electronic control unit arranged to generate a signal for correcting the ignition advance and a signal for varying the piloting of a solenoid valve provided in a duct which by-passes a throttle valve which controls the air supply to the engine. For this purpose, the electronic unit acquires the instantaneous speed of the engine and the air pressure in the inlet manifold by means of sensors. The electronic unit implements an LQI (linear-quadratic-integral) type of control based on a linear mathematical model of the engine.
摘要:
A differentiated intake system for multicylinder internal combustion engines in which the high-speed inlet pipes and the low-speed inlet pipes communicate with two separate high-speed and low-speed manifolds, respectively. Communication between the cylinders and the low-speed and high-speed pipes is controlled by a deflector valve, there being a single first butterfly valve at the inlet of the high-speed manifold and a plurality of second butterfly valves each in a respective low-speed inlet pipe. The first and second butterfly valves are operated simultaneously by means of a common actuator device.
摘要:
The chain for transmitting the drive between two overhead camshafts of a combustion engine for motor vehicles has an associated tensioning device comprising a rod-like support body fixed to the head in a position offset from the plane of the chain and a bush which can slide coaxially on the rod and is formed with a bracket carrying a shoe in sliding pressure contact with a free pass of the chain. The tensioning device incorporates means for automatically taking up the play between the shoe and the chain, including frictional axial positioning means between the bush and the rod for enabling the braked sliding of the former relative to the latter under the action of resilient and hydraulic thrust means.
摘要:
In a diesel engine with indirect injection, the precombustion chamber (18) and respective outflow duct (20) associated with each cylinder have a plane of symmetry which is tangential to the axis of the cylinder. In a preferred embodiment, the cylinder has an exhaust valve (13) whose axis (23) is near the plane of symmetry (21) of the precombustion chamber (18), and two inlet valves (8a, 9a) whose axes (24, 25) are arranged in a plane substantially parallel, or at any rate not greatly inclined, to the plane of symmetry (21) of the precombustion chamber (18).
摘要:
A device for automatic adjustment of the frequency of activation of a motor vehicle windscreen wiper driven by a motor is described. The main characteristic of the device lies in the fact that it comprises circuit means which control the frequency of activation as a function of the quantity of water present on the surface which is wiped by the windscreen wiper.