JPH0748989Y2 - Engine output information display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an output information display device for an engine, which determines a fuel injection amount from an intake pressure in an intake pipe and an engine speed.

B. Conventional Technology Conventionally, a vehicle speed meter and a tachometer are mounted on an instrument panel in a driver's cab, but a display device for displaying engine horsepower and engine torque has not been mounted.

C. Problems to be Solved by the Invention Therefore, the present applicant has previously proposed a device for displaying engine output and engine torque in Japanese Patent Application No. 1-102345.

By the way, as is well known, the engine horsepower can be calculated from the engine speed and the engine load, and the engine load is obtained from the intake air amount or the intake pressure. Therefore, for an engine equipped with an engine speed sensor and an intake air amount sensor, or an intake pressure sensor,
If the output of each of these sensors is taken in, the engine horsepower can be easily calculated.

However, the engine speed is uniquely obtained from the engine speed sensor output for any engine of any manufacturer, but the intake pressure is determined for each manufacturer and for each engine as shown in FIG. The output characteristics of the intake pressure sensor are different, and the intake pressure cannot be accurately detected by simply capturing the output of the intake pressure sensor. Therefore, in the case of an engine of the so-called D-Jetro type, the output characteristics of the intake pressure sensor for each engine of each manufacturer are stored in advance in the engine output information display device, and it corresponds to the vehicle to which the display device is attached. The output characteristic of the intake pressure sensor must be configured to be called from the memory, which causes a problem that the display device becomes large and expensive.

A technical problem of the present invention is to calculate and display output information of a so-called D-Jetro type engine without storing output characteristics of all intake pressure sensors in advance.

D. Means for Solving the Problem The present invention will be described with reference to FIG. 1 showing one embodiment. Output characteristic estimation means 11 for reading the respective atmospheric pressure sensor outputs, and for the turbo vehicle, estimating the output characteristic of the intake pressure sensor 2 mounted on the vehicle by reading the intake pressure sensor output during idling and during charging, A storage unit 12 that stores a basic output with respect to the engine speed for each vehicle, and an intake pressure calculation unit 13 that calculates the intake pressure from the read intake pressure sensor output based on the output characteristic estimated by the output characteristic estimation unit 11. According to the read engine speed, the engine basic output is obtained from the storage means 12, and the engine basic output and the calculated engine basic output are calculated. From the intake pressure by comprising an engine output calculation means 14 for calculating the engine output was, to solve the technical problems described above.

E. Action For non-turbo vehicles, the intake pressure when the engine is stopped and when the engine is idle (or at the time of charging) is taken in to estimate the output characteristic of the intake pressure sensor, and the true intake pressure is calculated from this output characteristic. For turbo vehicles, the sensor output characteristics are estimated by taking in the intake pressure during idling and during supercharging. On the other hand, a basic output, for example, a basic horsepower is obtained from the engine speed, and horsepower and torque, which are output information of the engine, are calculated and displayed based on the basic horsepower and the intake pressure.

It should be noted that, in the above D and E for explaining the configuration of the present invention, the drawings of the embodiments are used to make the present invention easy to understand, but the present invention is not limited to the embodiments.

F. Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 7.

FIG. 1 is a block diagram showing an output information display device of an engine according to the present invention and sensors of a vehicle equipped with this display device.

Both the engine speed sensor 1 and the intake pressure sensor 2 are mounted on a vehicle in which an engine output information display device is used. The engine speed sensor 1 outputs a speed signal proportional to the engine speed. , Intake pressure sensor 2
Outputs an intake pressure signal proportional to the pressure in the intake pipe. The determination of engine stop is made by the detection output of the engine speed sensor 1. Further, 3 is an idle switch, which identifies the idling state of the engine by a signal from the idle switch 3. Alternatively, it may be detected by software processing from the median value of the engine speed per unit time and the fluctuation amount. The output signals of the sensors 1 and 2 and the switch 3 are input to the output information display device 10 of the engine through an interface (not shown).

The output information display device 10 of the engine includes an output characteristic estimating circuit 11 that estimates the output characteristic of the intake pressure sensor 1 by reading the intake pressure sensor output when the engine is stopped and when the engine is idling, and a basic output value for the engine speed, for example, A memory circuit 12 in which the basic horsepower (Pso) is stored in advance,
Based on the sensor output characteristics estimated by the output characteristic estimation circuit 11, an intake pressure calculation circuit 13 that calculates the intake pressure from the read intake pressure sensor output, and an engine from the memory circuit 12 according to the read engine speed N The basic horsepower Pso is calculated, and the engine output, for example, engine horsepower Ps, is calculated from the engine basic horsepower Pso and the calculated intake pressure P.
And an engine output calculation circuit 14 for calculating the engine torque T
Have and. Specifically, the memory circuit 12 is configured as a ROM, and the other circuits are configured as a microcomputer such as a CPU, and the functions equivalent to the respective circuits are realized according to the procedure shown in FIGS. 2 and 3. Further, the calculated engine horsepower and engine torque are displayed on the display unit 15.

Hereinafter, a case where the engine output is calculated and displayed according to the flowcharts of FIGS. 2 and 3 will be described.

In FIG. 2, it is determined in step S1 whether the engine is stopped. If the engine is stopped, in step S2 the intake pressure sensor output Vo is read and it is determined whether the value is constant. Steps S1 and S2 are repeatedly executed until it becomes constant, and when the intake pressure sensor output Vo becomes constant, the process proceeds to step S3, and it is determined whether or not the previous intake pressure sensor output Vo 'is stored in the memory. If not stored, the intake pressure sensor output Vo is stored in the memory in step S14, and the process proceeds to step S6. If the intake pressure sensor output Vo 'is already stored, step S4
In, the Vo averaging process is performed by the following equation.

Vo = A * Vo + (1-A) * Vo 'Here, A is a weighted average coefficient and a value of about 1/2 to 1/16 is selected. Then, the process proceeds to step S5 and the Vo is stored in the memory.

In step S6, it is determined whether or not it is in the idle state. If it is in the idle state, the intake pressure sensor output V _IN is read in step S7, and when the value becomes constant, the process proceeds to step S8. Step
In S8, it is judged whether or not there is the previous data V _IN ′ in the memory, and if not, the V _IN is stored in the memory in step S15, and the process proceeds to step S11.

If V _IN ′ is already stored, proceed to step S9
_IN averaging processing is performed by the following equation.

V _IN = A × V _IN + (1−A) × V _IN However, A is the above-mentioned weighted average coefficient, and then the process proceeds to step S10 and the V _IN is stored in the memory.

Vo and V _IN thus obtained correspond to Po and P _IN , respectively, as shown in Fig. 4, but Po when the engine is stopped corresponds to 760 mmHg against atmospheric pressure, and P _IN when idle is 210 mmHg. The following processing is performed as equivalent.

Then, when it proceeds to step S11, the two data Vo in the memory are
And V _IN and the read intake air pressure sensor output V, the intake air pressure is estimated by the following equation obtained from FIG.

Then, engine horsepower and engine torque are calculated in step S12, and the engine output and engine torque are displayed on the display unit 15 in step S13.

FIG. 3 shows a concrete calculation procedure of the engine output and the engine torque.

The engine speed N is read in step S121, and the step
In S122, the intake pressure P calculated in the previous step S11 is read. In step S123, the basic horsepower Pso is obtained by looking up the map of FIG. 6 from the engine speed N. In step S124, the load coefficient K ′ is calculated from the intake pressure P according to the following equation.
Ask for.

K ′ = K1 × P + K2 However, K1 and K2 are constants determined by each engine type and are preset for each engine type.

Next, in step S125, the engine horsepower is calculated by the following equation.
Find Ps.

Ps = K ′ × P Further, in step S126, the engine torque T is calculated from the following equation.

Finally, in step S127, the engine output Ps and the engine torque T are displayed on the display unit 15.

By estimating the intake pressure sensor output in this way, it is possible to compare the engine power sensors with the horsepower and torque of multiple types of engines without storing all the intake pressure sensor output characteristics of the vehicles of multiple manufacturers in advance. It can be calculated and displayed simply by capturing the output of the intake pressure sensor.

Although the case where the horsepower and the torque are calculated and displayed has been described, only one of them may be calculated and displayed. Further, the basic horsepower is obtained from the engine speed and the engine horsepower is calculated by the load coefficient, and the torque is converted from the horsepower. However, the relationship between the engine speed and the engine torque is stored in advance, and Alternatively, the engine torque may be obtained and the horsepower may be calculated from the torque.

Furthermore, although the non-turbo vehicle has been described above, the horsepower and torque of the turbo vehicle can be easily calculated and displayed by a similar method. In this case, when estimating the intake pressure sensor output characteristics, the intake pressure sensor output Vo during engine idling and the intake pressure sensor output Vt during charging are respectively captured, and Vo is 210 mmHg, Vt is the known boost pressure for each engine. And it is sufficient. Therefore, in this case, it is necessary to store in advance the intake pressure of each engine at the time of supply of the turbo vehicle.

G. Effect of the Invention Since the present invention is configured as described above, it is possible to accurately calculate and display each engine output without storing the output characteristics of multiple types of intake pressure sensors in advance.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of an engine information display device according to the present invention, FIGS. 2 and 3 are flow charts showing an output procedure of calculation display of engine output in this embodiment, FIG. 4 and FIG. FIG. 5 is an explanatory diagram for estimating the output characteristic of the intake pressure sensor, FIGS. 6 and 7 are explanatory diagrams for calculating horsepower, and FIG. 8 is a conventional explanatory diagram. 1: Engine speed sensor, 2: Intake pressure sensor 10: Information display device, 11: Output characteristic estimation circuit 12: Basic output storage circuit, 13: Intake pressure calculation circuit 14: Output calculation circuit, 15: Display

Claims (2)

[Scope of utility model registration request] 1. A device for calculating and displaying output information of a plurality of types of engines equipped with an intake pressure sensor and an engine speed sensor, and reading the intake pressure sensor outputs when the engine is stopped and idling, respectively, to a vehicle. Output characteristic estimation means for estimating the output characteristic of the installed intake pressure sensor, storage means for storing the basic output for the engine speed for each type of vehicle, and output characteristic estimated by the output characteristic estimation means Based on the intake air pressure sensor output, the intake pressure calculation means calculates the intake pressure, and the engine basic output is obtained from the storage means according to the read engine speed, and the engine basic output and the calculated engine basic output are calculated. And an engine output calculating means for calculating an engine output from the intake pressure. Engine output information display device. 2. An apparatus for calculating and displaying output information of a plurality of types of engines equipped with an intake pressure sensor and an engine speed sensor, and reading the intake pressure sensor output during idling and during supercharging respectively to a vehicle. Output characteristic estimation means for estimating the output characteristic of the installed intake pressure sensor, storage means for storing the basic output for the engine speed for each type of vehicle, and output characteristic estimated by the output characteristic estimation means Based on the intake air pressure sensor output, the intake pressure calculation means calculates the intake pressure, and the engine basic output is obtained from the storage means according to the read engine speed, and the engine basic output and the calculated engine basic output are calculated. An engine comprising an engine output calculation means for calculating an engine output from the intake pressure. Output information display device.