JPS58117333A - Controller for engine - Google Patents

Abstract

PURPOSE:To improve workability and output, and to ameliorate fuel cost by correcting controllers of evey kind controlling the state of combustion of the engine by a correction factor corresponding to the humidity of a suction and correcting the correction factor in response to the temperature of the suction. CONSTITUTION:An air flow sensor 3, a humidity sensor 8 and a suction-temperature sensor 10 are disposed into the suction path 2 of an engine proper 1, and the detecting value of the air flow sensor 3 is inputted to a fundamental injection pulse generator 5 together with the detecting value of a revolution- number sensor 4. The detecting value of the humidity sensor 8 is inputted to a first correction-factor generating circuit 9, and the correction factor corresponding to the reduction section of the quantity of oxygen corresponding to humidity is outputted. The detecting value of the suction-temperature sensor 10 is inputted to a second correction-factor generating circuit 11, and the output of the first correction-factor generating circuit 9 is further corrected in response to the temperature of the suction, and outputted to an arithmetical circuit 6. Fundamental injection pulses are corrected in the arithmetical circuit 6, and a fuel injection valve 7 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine control device that detects the humidity of intake air and performs corrective control of various control devices controlling the combustion state of the engine in accordance with the humidity deterioration.

When the humidity of the outside air changes, the humidity of the intake air changes, and the combustion rate in the combustion chamber of the engine changes under the influence of the moisture in the intake air. That is, when the humidity of the intake air is low, the combustion speed of the engine is high, and as the humidity increases, the combustion speed becomes slow.

For this reason, conventionally, when the humidity of the intake air is low, the engine's ignition timing advance is delayed from the normal advance, and when the humidity is high, the ignition timing is advanced, thereby preventing knocking caused by abnormal combustion in the engine and reducing fuel consumption. It is known that the direction of
No. 4).

However, the humidity of the intake air is usually detected as relative humidity, not the actual amount of moisture contained in the intake air, that is, the absolute humidity.

However, since it is the amount of moisture in the intake air that affects combustion, there is a problem in that it is difficult to adequately control relative humidity.

In order to improve the above drawbacks, this invention simultaneously measures the humidity and temperature of the air taken into the engine, corrects the humidity of the intake air with temperature, and adjusts the combustion state of the engine according to the corrected humidity. The purpose of this invention is to provide an engine control device that provides good operating performance and high combustion efficiency by reviewing various control devices such as the ignition timing setting device that governs the control devices.

The present invention will be specifically described below based on embodiments shown in the drawings.

In Fig. 1, l is the engine body, 2 is the intake passage,
An air flow sensor 3 is provided in this intake passage 2, and one of various control devices receives an output signal from this air flow sensor 3 and an output signal from an engine rotation speed sensor 4.
A basic injection bus generator 5 is electrically connected to a fuel injection valve 7 via an arithmetic circuit 6.

Reference numeral 8 denotes a humidity sensor for detecting the humidity S% of the intake air A in the intake passage 2, and is connected to the first correction factor generating circuit 9. Reference numeral 10 denotes an intake air temperature sensor for detecting the temperature T0 of the intake air A, and is connected to the second correction factor generation circuit 11. 1. After the humidity signal from the first correction factor generation circuit 9 is corrected with the temperature signal from the second correction factor generation circuit 11, it is input to the arithmetic circuit 6 and output signal from the basic injection bus μ bus generator 5. Add correction to.

The first and second correction factor generating circuits 9 and 11 shown in L and the arithmetic circuit 6 constitute a control circuit.

In the L configuration, the amount of intake air gA is detected by the air flow sensor 3, and the detection output is inputted to the basic injection pulse generator 5 together with the output signal from the rotation speed sensor 4, and the fuel injection pulse generator 5 generates a fuel injection according to the amount of intake air. is injected from the fuel injection valve 7,
The fuel supplied into the combustion chamber of the engine body 1 is appropriately controlled.

However, if the humidity S of the intake air A changes due to a change in outside air humidity, the air-fuel ratio will inevitably change, so in order to correct this, the humidity signal from the humidity sensor 8 is sent to the first correction factor generating circuit 9. In order to reduce the amount of fuel injected from the fuel injection valve 7 by the amount that the amount of oxygen in the intake air A decreases when the humidity increases, the arithmetic circuit 6 calculates the amount of fuel from the first correction factor generation circuit 9. Adjust using the correction signal.

Furthermore, when the temperature T of the intake air A increases by 1, as shown by the characteristic S in FIG. d) increases, and the amount of oxygen in the intake air A decreases by the increased amount of water. In order to correct this, the temperature signal from the intake air temperature sensor 10 is applied to the second correction factor generation circuit 11, and the fuel injection amount valve 7 The calculation circuit 6 is corrected by adding temperature correction to the humidity signal from the first correction factor generating circuit 9 so as to reduce the fuel injection amount from the first correction factor generating circuit 9.

As a result, the combustion efficiency of the engine can be increased, driving performance without the risk of knocking can be obtained, and moreover, it can contribute to improving fuel efficiency.

In the embodiment E, a case has been described in which the fuel injection valve 7 is controlled to correct the air-fuel ratio. It can be applied when performing correction control using a correction factor according to humidity and temperature.

As described in detail above, this invention corrects the temperature of the humidity of intake air, and controls various control devices that govern the combustion state of the engine according to the corrected humidity.
It has the advantage of improving drivability, output, and fuel efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an engine control device according to the present invention, and FIG. 2 is a diagram showing the relationship between humidity and temperature to explain the operation of FIG. 1. DESCRIPTION OF SYMBOLS 1... Engine body, 2... Intake passage, 3... Air flow sensor, 7... Fuel injection valve, 8... Humidity sensor, 9... First correction factor generation circuit, 10... -Intake temperature sensor, 11...first correction factor generation circuit.

Claims (1)

[Claims] (1) An intake air temperature sensor that detects the temperature of intake air taken into the engine, an intake air humidity sensor that detects the humidity of intake air, and an intake air humidity sensor that receives the outputs of the various intake air humidity sensors that control the combustion state of the engine. Control of an engine, comprising: a control circuit that corrects the control device with a correction factor according to humidity, and corrects the correction factor L according to the intake air temperature in response to the output of the intake air temperature sensor. Device.