Vehicular air-pollution preventive system

Claim 2

An air pollution preventive system for a motor vehicle having an internal combustion engine provided with an intake manifold, exhaust manifold and carburetor having a throttle valve comprising: a solenoid valve assembly having means therein defining a valve chamber having an inlet opening and an outlet opening, a movable valve element disposed within said valve chamber movable to an open position providing communication between said inlet and outlet openings and to a closed position preventing communication between said inlet and outlet openings, a movable core integral with said valve element, a solenoid coil effective when energized to effect movement of said valve element to said open position, and spring means urging said valve element into said closed position; means providing communication between said inlet opening and said exhaust manifold and between said outlet opening and said intake manifold; and control means for providing an electrical output signal to said solenoid valve assembly to energize said solenoid coil and effect movement of said valve element to said open position in response to acceleration of hill-climbing operatinG conditions of the motor vehicle.

Claim 3

A system according to claim 1, wherein said operating conditions are defined by a predetermined combination of the angular position of the carburetor throttle valve and the motor vehicle speed selected in the transmission system.

Claim 4

A system according to claim 1, wherein said operating conditions are defined by a predetermined combination of the angular position of the carburetor throttle valve and engine speed.

Claim 5

A system according to claim 1, wherein said control means comprises a throttle valve switch operated by a cam arrangement cooperating with the throttle valve and a vehicle speed switch connected with an operated by a vehicle speed detector, means connecting said throttle valve and vehicle speed switches in series with an electrical power source and said solenoid coil, said cam arrangement comprising a cam element having a partially protruded peripheral edge, means mounting said cam element for angular movement integrally with said throttle valve, an actuating rod rigidly connected with said throttle valve switch and positioned relative to said cam element, and a compression spring forcing said actuating rod toward said cam element to keep said throttle valve switch open, said protruded edge being shaped and sized to bring said actuating rod into a position to close said throttle valve switch when said cam element is angularly moved with said throttle valve to contact and depress said actuating rod toward said throttle valve switch, and said vehicle speed detector having means operative to close said vehicle speed switch when the detector detects a predetermined range of vehicle speeds and for delivering a voltage proportional to the detected vehicle speed; whereby said solenoid coil is energized and said valve element moved to said open position when both the throttle valve and vehicle speed switches are concurrently closed.

Claim 6

A system according to claim 1, wherein said control means comprises a throttle valve switch operated by a cam arrangement cooperating with the throttle valve and an engine speed switch connected with and operated by a solenoid device, means connecting said throttle valve and engine speed switches in series with an electrical power source and said solenoid coil, said cam arrangement comprising a cam element having a partially protruded peripheral edge, means mounting said cam element for angular movement integrally with said throttle valve, an actuating rod rigidly connected with said throttle valve switch and positioned relative to said cam element, and a compression spring forcing said actuating rod toward said cam element to keep said throttle valve switch open, said protruded peripheral edge being shaped and sized to bring said actuating rod into a position to close said throttle valve switch when said cam element is angularly moved with said throttle valve to contact and depress said actuating rod toward said throttle valve switch, and said solenoid device comprising a pulse counter having an input terminal connected to an ignition distributor of the engine for detecting the number of pulses supplied therefrom, a solenoid coil connected with the output terminal of said pulse counter and energized thereby when said number of pulses falls within a range corresponding to a predetermined range of engine speeds, a moving core cooperating with said solenoid coil of the solenoid device and normally held in a position to keep said engine speed switch open when the associated solenoid coil remains deenergized, and a connecting rod rigidly connecting said moving core of the solenoid device and said engine speed switch, said moving core of the solenoid device being moved to a position in which said engine speed switch is closed through the associated connecting rod when said solenoid coil of the solenoid device is energized; whereby said solenoid coil of said control valve assembly is energized and said valve element moved to said open position when both said throttle valve and engine speed switcheS are concurrently closed.

Claim 7

A system according to claim 5, wherein a filter is provided in said means providing communication between said inlet opening and said exhaust manifold.