JPS60252158A - Heater control device for engine intake air heating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A1 Object of the Invention (1) Field of Industrial Application The present invention relates to a heater control device for heating intake air of an engine.

(2) Conventional technology When starting an engine at low temperatures, if intake air and fuel are supplied at low temperatures, the fuel will be supplied to the combustion chamber of the engine body without being sufficiently atomized, resulting in a longer starting time. In addition, carbon monoxide and hydrocarbons in the exhaust gas increase, and drivability after a cold start deteriorates. Therefore, it has been conventional practice to provide a heater for heating the intake air in the intake passage of the engine, and the heater for heating the intake air is controlled so that it operates when the engine is fully exploded and the engine water temperature is below a set value. has been done.

(3) Problems to be Solved by the Invention However, activating the intake air heater after the complete explosion of the engine has the effect of reducing carbon monoxide and hydrocarbons in the engine exhaust at the time of starting, but it does not improve the starting performance. does not improve.

The first object of the present invention is 1. In view of the above circumstances, the intake air heating heater is energized for a certain period of time depending on the conduction of the ignition switch, improving starting performance and preventing unnecessary power consumption, and further heating the intake air for a certain period of time after the ignition switch is turned on. An object of the present invention is to provide a heater control device for heating intake air of an engine, which facilitates restarting the engine by energizing a heater for the engine.

In addition to the first object, a second object of the present invention is to continuously heat the intake air during engine starting operation by energizing the intake air heating heater in accordance with the operation of the starter. It is an object of the present invention to provide a heater control device for heating intake air of an engine that has good startability.

Structure of the B0 Invention (1) Means for Solving the Problems The control device according to the first invention includes: a first timer that outputs a first operating signal for a first set time from when the ignition switch is turned on; a second timer that continues to output the second actuation body number from the input of the detonation signal until a second set time elapses after the input of the complete detonation signal is stopped; and at least one of the first and second actuation body numbers; and a determination circuit that outputs a signal for operating an intake air heating heater based on a signal indicating that at least one of the engine water temperature and the intake air temperature is below a set value.

Further, the control device according to the second invention includes a first timer that outputs a first actuation signal for a first set time from when the ignition switch is turned on; until the second set time elapses.
a second timer that continues to output the operating body number; the first and second timers;
Either one of the operating body number and the third operating body number indicating that the Stark has been activated, and the fourth operating body number indicating that at least one of the engine water temperature and the intake temperature is below the set value. and a determination circuit that outputs a signal for operating an intake air heating heater in response to an input.

(2) Effect In the first invention, when at least one of the engine water temperature and the intake temperature is below the set value, the engine is activated for the first set time from the time the ignition switch is turned on, or from the time the engine complete combustion signal is input. 2nd time after stop input of explosion signal
The intake air heating heater is operated until the set time has elapsed.

In the second invention, when at least one of the engine water temperature and the intake temperature is below the set value, the complete combustion signal is input only for the first set time from the time when the ignition switch is turned on, or from the time when the engine complete combustion signal is manually input. The intake air heating heater is activated until the second set time period elapses after the engine stops or when the starter is activated.

(3) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, an intake air heating heater 1 is provided in the middle of an intake pipe line (not shown) of an engine. A battery 3+ is connected via a relay switch 2. This relay switch 2 and the relay coil 4 that constitutes the relay
The excitation and demagnetization of the relay coil 4 are controlled by the control device 5 according to the present invention, and when the relay coil 4 is energized, the relay switch 2
becomes conductive, and the intake air heating heater 1 is energized.

The control bag W5 has first to fourth input terminals 6 to 9, and a first to fourth input terminals 6 to 9.
An ignition switch 10 is connected to the input terminal 6, and a high-level signal is input to the first input terminal 6 when the ignition switch 10 is turned on. Further, the second input terminal 7 is connected to a detector 1 for detecting a complete explosion state of the engine, for example, the I terminal of an IC regulator in an AC generator, and when the engine reaches a complete explosion state,
A high level engine complete explosion signal is input from the detector 11 to the second input terminal 7. A starter switch 12 is connected to the third input terminal 8.
When conductive, a high-level third operating signal is input to the third input terminal. Further, an engine water temperature detection switch 13 is connected to the fourth terminal 9, and the engine water temperature detection switch 3 is set to a set value, for example, 65°C.
When the voltage is below, conduction occurs and a high-level fourth actuation signal is input to the fourth input terminal.

In the control device 5, a diode 1 is connected to the first input terminal 6.
A first timer 18 is connected via 4.

When a high-level signal is input as shown in FIG. 2(a), this first timer 18 is activated for a first set time T from the rising edge of the input signal, as shown in FIG. 2(b).
For example, it operates to output a high-level first operating signal that lasts for 30 seconds.

Further, the second input terminal 7 is connected to a second timer 19 via a diode 15. This second timer 19 is
When a high-level signal is input as shown in a), the signal rises in response to the rise of the input signal, and after the fall of the input signal, as shown in FIG. A high-level second activation signal is output that lasts until, for example, 30 seconds have elapsed. Therefore, when the time from when the input signal to the second timer 19 falls to when it rises again is less than or equal to the second set time T2, the output of the second timer 19 remains at a high level for m consecutive times.

The first to fourth actuation signals are sent to the OR gate 21 and the AND
The signal is input to a judgment circuit 20 consisting of a gate 22 and a NOT game I.23. That is, the outputs of the first timer I8 and the second timer 19 are input to the OR gate 21, and the third operating signal applied to the third input terminal 8 is connected to the remaining input terminal of the OR gate 21 via the diode 16. is input. The output of the OR gate 21 is input to one input terminal of the AND gate 22 and inverted by the NOT gate 23, and the output of the OR gate 21 is input to the fourth input terminal 9 to the other input terminal of the A, N D gate 22. A fourth operating signal is provided via diode 17.

In such a judgment circuit 20, when at least one of the first to third actuation signals input to the OR gate 21 is at a high level and the fourth actuation signal is at a high level, the intake To activate heating heater 1, press NO.
A low level signal is output from the T gate 23, and a high level signal is output from the AND gate I.22.

The output of the judgment circuit 20 is the PNPI-transistor 25.
and an NPN transistor 26. That is, the PNP1 transistor 25 and the NPN transistor 26 are connected in series via the relay coil 4, and the PNP1 transistor 26 is connected in series via the relay coil 4.
The emitter terminal of 5 is connected to the anode of battery 3. Furthermore, the output terminal of the NOT gate I.23 is connected to the base of the PNP transistor 25, and the output terminal of the AND gate 22 is connected to the base of the Nl) NI- transistor 26. Therefore, in this switching circuit 24, when the output of the NOT gate 23 is at a low level, P
When the NP transistor 25 is conductive and the output of the AND gate 22 is at a high level, the NPN transistor 26 is conductive. When both transistors 25 and 26 are conductive, the relay coil 4 is excited, the relay switch 2 is conductive, and the intake air heating heater 1 is energized.

Next, the operation of this embodiment will be explained. When the engine water temperature is a low temperature of 65° C. or lower, a high-level fourth actuation signal is input to the fourth input terminal 9.

In this state, when the ignition switch 10 becomes conductive, the engine reaches full combustion, or the starter starts operating, the NOT gate 23 outputs a low level signal, and the AND gate 22 outputs a high level signal. A level signal is output, and both transistors 25 and 26 are made conductive, and the relay coil 4 is energized.Thereby, the relay switch 2 is made conductive, and the intake air heating heater 1 is energized.

When the engine is cold, the ignition switch 10 and the starter switch 12 are electrically connected before the engine reaches a complete explosion state. Before the engine reaches a complete explosion state, the intake air is heated by the intake air heating heater 1, and the fuel is heated. can be sufficiently atomized. As a result, it is possible to improve starting performance and drivability.

In addition, by connecting the ignition switch 10 for the first set time T1 from the time the ignition switch 10 is turned on and outputting a high-level first operation signal from the first timer 18, the intake air heating heater is activated at the same time as the ignition switch 10 is turned on. In addition, if the ignition switch 10 is left in a conductive state even after the first set time T1 has elapsed, the power supply to the heater 1 for preventing intake force U is stopped, thereby reducing wasteful power consumption. By avoiding this, it is possible to prevent the battery 3 from running out of power. Moreover, starter switch 1
Since the intake air heating heater 1 is energized at the same time as the ignition switch 2 becomes conductive, the intake air heating heater 1 is energized at the same time as cranking when the engine is started after the ignition switch 10 has been left in the conductive state as described above. be able to.

Furthermore, when the engine reaches a complete explosion state, the second timer 19 continuously outputs a high-level second operation signal until the second set time T2 elapses after the engine stalls, so the engine can be started. Later, the intake air heating heater 1 is energized until the engine water temperature rises to heat the intake air, thereby improving drivability after a cold start and reducing carbon monoxide and hydrocarbons in the exhaust gas.

In addition, even if the engine stalls for some reason after starting, the intake air is heated until the second set time T2 has elapsed, making it easy to restart the engine.

As another embodiment of the present invention, the fourth input terminal 9 may be connected to an intake temperature detection switch that is turned on when the temperature is below a set value, instead of the engine water temperature detection switch 13. A high-level fourth actuation signal may be input to the fourth input terminal 9 when both switches are conductive.

Effects of C1 Invention As described above, the control device according to the first invention includes a first timer that outputs a first actuation signal for a first set time from when the ignition switch is turned on; a second timer that continues to output the second actuation signal until a second set time elapses after the input of the detonation signal is stopped; at least one of the first and second actuation signals and at least one of the engine water temperature and the intake air temperature; and a determination circuit that outputs a signal to operate the intake air heating heater in response to a signal indicating that the temperature is below the set value. Heating can be performed and starting performance can be improved. Furthermore, since the first actuation signal lasts for the first set time from when the ignition switch is turned on, wasteful power consumption of the intake air heating heater can be avoided. Further, since the intake air heating heater is activated by the engine complete combustion signal, it is possible to reduce carbon monoxide and hydrogen oxide in the exhaust gas, and to improve drivability after starting at a low temperature.

Furthermore, the second activation signal is generated after the input of the engine complete explosion signal is stopped.
Since it lasts for the second set time, restarting the engine after stalling becomes easy.

Further, in the second invention, since the intake air heating heater is operated also by the operation of the starter, in addition to the effects of the first invention, the intake air heating can be continuously performed during the engine starting operation, It is possible to prevent generation of high inrush current when the intake air protection heater is activated, suppress battery drain, and improve engine starting performance in cold conditions.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an electric circuit diagram, FIGS. 2(a) and (b) are diagrams showing the characteristics of the first timer, and FIGS. 3(a) and (b) are diagrams showing the characteristics of the first timer. ) is a diagram showing the characteristics of the second timer. ■...Heater for heating intake air, 5...Control device, 10.
...Ignition switch, 18...1st timer,
19...Second timer, 20...Judgment circuit, T1...
・First set time, T2...Second set time Figure 2 Omzu procedural amendment (method) September 3, 1980, Kumu, Mr. Commissioner of the Japan Patent Office - 1. Indication of the case 1988 Patent Application No. 07943 2, Name of the invention: Heater control device for heating intake air for industrial/engine engines 3, Relationship with the case of the person making the amendment Patent applicant name: (532) Honda Motor Co., Ltd. 4, Agent
Person 〒105 August 8, 1980 (Shipping date: August 28, 1980)
Contents of the amendment (1) Page 15, line 7 of the specification... [Figure 3 (σ1, (b) is]...)...[Figure 3 is]... Corrected to...

Claims (2)

[Claims] (1) A first timer that outputs a first operating body number for a first set time from when the ignition switch is turned on;
a second timer that continues to output a second operating body number until a set time elapses; and a second timer that outputs at least one of the first and second operating body numbers and at least one of the engine water temperature and the intake air temperature below the set value. 1. A determination circuit for outputting a signal indicating whether to operate an intake air heating heater based on a signal indicating the operation of the intake air heating heater for an engine. (2) A first timer that outputs a first operating body number for a first set time from when the ignition switch is turned on;
a second timer that continues to output a second actuation signal until a set time elapses; at least one of the first and second actuation signals and a third actuation signal indicating that the starter has been activated; and a determination circuit that outputs a signal for activating the intake air heating heater in response to input of a fourth operating body symbol indicating that at least one of the engine water temperature and the intake air temperature is below a set value. Heater control device for heating engine intake air.