# US 4,398,174 A · Fuel consumption signalling system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,398,174 A - Document ID: US4398174A - Status: Granted - Kind: A - Application number: 06/207,652 - Filed: 1980-11-17 - Granted: 1983-08-09 - Earliest claimed: 1979-04-05 - Inventors: Raymond P. Smith, Jr. - Web page: https://patentgrep.com/patent/US4398174A ## CPC - B60R 16/0236: {for economical driving} - F02B 77/084: {indicating economy} - Y02T 10/84: Data processing systems or methods, management, administration - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A fuel consumption signalling system for signalling both efficient and inefficient fuel consumption conditions in the engine of a motor vehicle is herein disclosed. The system comprises an alarm circuit connected in series with an indicator circuit including an indicator light connected in parallel with a vacuum operated switch pneumatically connected to the engine manifold. An electric potential sufficient to actuate the alarm circuit, but insufficient to actuate both the indicator light and the alarm circuit is applied across the series connected indicator and alarm circuits. When the engine is consuming fuel efficiently, the vacuum switch is open, and the electric potential is divided between the indicator circuit and the alarm circuit. The divided potential is sufficient to illuminate the indicator light, but insufficient to actuate the alarm circuit. However, when the engine consumes fuel inefficiently, the vacuum switch closes, shunting the entire electric potential across the alarm circuit, thereby actuating it. The signalling system may also include an automatic throttle plate control. ## Claims ### Claim 1 A fuel consumption signalling system for signalling both efficient and inefficient fuel consumption conditions in the engine of a motor vehicle, comprising: (a) an alarm circuit including, connected in parallel, an alarm light and a resistor, said alarm circuit being actuatable by a predetermined potential difference; (b) an indicator circuit connected to said alarm circuit in series to form a series circuit, said indicator circuit including, connected in parallel, (i) an indicator light for indicating an efficient operating condition in the motor vehicle engine and for serving as a voltage divider for any potential applied across said series circuit, and (ii) a vacuum operated, normally open switch pneumatically connected to the engine manifold for shunting any electric potential applied across said indicator lamp around said indicator lamp when the manifold pressure closes said switch, and (c) means for applying a potential difference across the series circuit, said applied potential being greater than the potential necessary to actuate the alarm circuit when said potential is shunted around the indicator light when the vacuum operated switch is closed, but less than the potential necessary to actuate the alarm circuit when the switch is open and the applied potential is divided between the indicator light and the alarm circuit. ### Claim 2 (depends on 1) The fuel consumption signalling system of claim 1, wherein said alarm circuit further includes, connected in parallel, a time delay circuit for actuating an audio alarm generator a preset time after said alarm circuit is actuated. ### Claim 3 (depends on 2) The fuel consumption signalling system of claim 2 further including a digital counting means connected to said time delay circuit for counting and displaying the number of occasions the engine was run in inefficient fuel consumption condition for a period of time greater than the time delay of said time delay circuit. ### Claim 4 (depends on 3) The fuel consumption signalling system of claim 3 further including a relay connected to the time delay circuit for actuating a throttle plate control a preset time after said alarm circuit is actuated. ### Claim 5 (depends on 4) The fuel consumption signalling system of claim 4, wherein said throttle plate control comprises: (a) a lever connected to the carburetor throttle blade rod of the engine of the motor vehicle, and (b) a solenoid actuatable by said relay and having an extensible plunger for limiting the motion of said lever when said solenoid is actuated, whereby the position of the throttle plate is automatically confined to an angular position consistent with efficient fuel consumption a preset time after said alarm circuit is actuated. ### Claim 6 (depends on 5) The fuel cunsumption signalling system of claim 5, further including means for overriding said throttle plate control including a microswitch mounted under the accelerator pedal of the motor vehicle for electrically disconnecting said relay from said time delay circuit when said accelerator is pressed to the floor of the vehicle, whereby said extensible solenoid plunger retracts to allow free movement of said lever connected to said throttle plate rod. ### Claim 7 (depends on 6) The fuel consumption signalling system of claim 6, wherein said microswitch includes a tactile indicating means for indicating when said switch is operated to disconnect said relay from said time delay circuit. ### Claim 8 (depends on 7) The fuel consumption signalling system of claim 7, wherein said time delay circuit is adjustable to actuate said audio alarm generator, said counter, and said throttle plate control at a variety of times after said alarm circuit is actuated. ### Claim 9 A fuel consumption signalling system for signalling both efficient and inefficient fuel consumption conditions in the engine of a motor vehicle, comprising: (a) an alarm circuit including, connected in parallel, an alarm light, a resistor, and a time delay circuit having an audio alarm generator, said alarm circuit being actuatable by a predetermined potential difference; (b) an indicator circuit connected in series with said alarm circuit to form a series circuit, said indicator circuit including, connected in parallel, (i) an indicator light for indicating an efficient operating condition in the engine of the motor vehicle and for serving as a voltage divider for any potential applied across said series circuit, and (ii) a vacuum operated, normally open switch pneumatically connected to the engine manifold of the motor vehicle for shunting any electric potential applied across said indicator lamp around said lamp when a predetermined manifold pressure indicative of a fuel waste condition closes said switch, and (c) means for applying a potential difference across the series circuit, said potential difference being greater than the predetermined potential difference necessary to actuate the alarm circuit when said vacuum operated switch is closed, but less than the predetermined potential necessary to actuate the alarm circuit when the switch is open and the potential difference is divided between said indicator light and said alarm circuit. ### Claim 10 (depends on 9) The fuel consumption signalling system of claim 9 further including a digital counting means connected to said time delay circuit for counting and displaying the number of occasions an inefficient fuel consumption operating condition lasted in said engine for a time period greater than the present time delay period of said time delay circuit. ### Claim 11 (depends on 10) The fuel consumption signalling system of claim 10, further including a relay connected to said time delay circuit for actuating a throttle plate control a preset time after said alarm circuit is actuated. ### Claim 12 (depends on 11) The fuel consumption signalling system of claim 11, wherein said throttle plate control includes: (a) a lever connected to the throttle plate rod of the carburetor of the engine of the motor vehicle, and (b) a solenoid actuatable by said relay and having an extensible plunger for limiting the movement of said lever when said solenoid is actuated, whereby the position of the throttle plate is automatically confined to an angular position consistent with efficient fuel consumption a preset time after said alarm circuit is actuated. ### Claim 13 (depends on 12) The fuel consumption signalling system of claim 12, further including means for overriding said throttle plate control including a microswitch mounted under the accelerator pedal of the motor vehicle for electrically disconnecting said relay from said time delay circuit when said accelerator is pressed to the floor of the vehicle. ### Claim 14 (depends on 13) The fuel consumption signalling system of claim 13, wherein said microswitch includes a tactile indicating means for indicating when said switch is operated to disconnect said relay from said time delay circuit.