# US 5,345,907 A · Engine control system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,345,907 A
- Document ID: US5345907A
- Status: Granted
- Kind: A
- Application number: 08/038,337
- Filed: 1993-03-12
- Granted: 1994-09-13
- Earliest claimed: 1992-03-17
- Assignees: Mazda Motor Corporation
- Inventors: Toshihiro Matsuoka
- Web page: https://patentgrep.com/patent/US5345907A

## CPC

- B60K 31/00: Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator
- F02D 11/105: {characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque}
- F02D 2011/102: {at least one throttle being moved only by an electric actuator}
- F02D 2200/501: Vehicle speed
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)

## Abstract

An engine control system for a vehicle which controls the output of the engine in response to change in the accelerator depression detects the accelerator depression fluctuation rate and the vehicle speed fluctuation rate. The control system increases the change in the engine output for a given change in the accelerator depression when the accelerator depression fluctuation rate is large and the vehicle speed fluctuation rate is small and reduces the same when the change in the accelerator depression fluctuation rate is small and the vehicle speed fluctuation rate is large.

## Claims

### Claim 1

An engine control system for a vehicle comprising
a first detecting means which detects the state of driver operation for the engine,
a second detecting means which detects the change in the running state of the vehicle with respect to the state of the driver operation,
a comparator means which compares the change in the state of the driver operation detected by the first detecting means with the change in the running state of the vehicle detected by the second detecting means, and
an engine output control means which controls the output of the engine in response to a driver operation,
wherein said engine output control means increases the change in the engine output for a given amount of driver operation when said comparator means determines that the change in the state of the driver operation is large and the change in the running state of the vehicle is small and reduces the same when said comparator means determines that the change in the state of the driver operation is small and the change in the running state of the vehicle is large.

### Claim 2 (depends on 1)

An engine control system as defined in claim 1 in which said change in the state of the driver operation detected by the first detecting means is represented by the accelerator depression fluctuation rate and said change in the running state of the vehicle detected by the second detecting means is represented by the vehicle speed fluctuation rate.

### Claim 3 (depends on 2)

An engine control system as defined in claim 2 in which said engine output control means increases or reduces the change in the engine output for a given amount of driver operation by changing a throttle control gain and the engine output control means increases the throttle control gain when the accelerator depression fluctuation rate is larger than a threshold value which increases with increase of the vehicle speed fluctuation rate.

### Claim 4 (depends on 1)

An engine control system as defined in claim 1 in which said engine output control means increases or reduces the change in the engine output for a given amount of driver operation by changing a throttle control gain when said comparator means determines that the change in the state of the driver operation is larger than the change in the running state of the vehicle and otherwise increases or reduces the same by changing the air-fuel ratio.

### Claim 5

An engine control system for a vehicle comprising
a first detecting means which detects the accelerator depression fluctuation rate,
a second detecting means which detects the vehicle speed fluctuation rate,
a comparator means which compares the accelerator depression fluctuation rate detected by the first detecting means with the vehicle speed fluctuation rate detected by the second detecting means, and
an engine output control means which controls the output of the engine in response to change in the accelerator depression,
wherein said engine output control means increases the change in the engine output for a given change in the accelerator depression when said comparator means determines that the change in the accelerator depression fluctuation rate is large and the vehicle speed fluctuation rate is small and reduces the same when said comparator means determines that the change in the accelerator depression fluctuation rate is small and the vehicle speed fluctuation rate is large.