JPH10210679A - Charging generator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the rotational speed, primarily, the idling rotational speed of an engine, so as to improve the fuel consumption of the engine by deciding the generated voltage, based on the signal of the detected temperature of a generator. SOLUTION: A generator 1 comprises a power substrate 10, armature windings 11a, 11b, and 11c of three-phase Y connection, a rectifier 12 for converting the AC output of the armature winding 11 into DC, and a field winding 13 for supplying armature windings 11a, 11b, and 11c with magnetic fluxes. Moreover, the interior of the power board is composed of a power transistor 10 Darlington-connected, diodes 102a, 102b, 102c, 102d, and 102e for detecting the temperature, a power diode 103, and a resistor 104. Then, the diodes 102a-102e are constituted of five diodes connected in series, and they perform the control of an engine geared to the drive torque of a generator 1, by detecting the temperature of a generator 1 and performing the compensation of torque. As a result, the rotational speed, primarily the idling rotational speed of an engine is stabilized, and the fuel consumption of the engine can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a power generation system used for an automobile or the like, and more particularly to a vehicle charging / generator capable of reliably performing temperature compensation of a device having a power generation control function incorporated in an engine control device. .

[0002]

2. Description of the Related Art A method for controlling a generator by a microcomputer installed outside the generator is described in JP-B 1-3-3.
No. 9306, and the like. In this method, the temperature of the battery is detected, and a power generation amount corresponding to the temperature is generated.

[0003]

However, this prior art does not discuss a temperature compensation method when the microcomputer detects the mechanical load (drive torque) of the generator. Generator mechanical load (drive torque)
Changes with the temperature of the generator itself, and the load state can be detected by the operation signal of the electric load switch,
The driving torque of the generator cannot be accurately grasped, and the rotation speed when turning on and off the electric load such as headlights and air conditioners is not stable (especially during idling), and in some cases, such as an engine stop was there.

In the present invention, the temperature of the generator is accurately detected, the engine is controlled in accordance with the driving torque of the generator, the engine speed, mainly the idle speed, is stabilized, and the fuel efficiency of the engine is reduced. The purpose is to improve.

[0005]

SUMMARY OF THE INVENTION The present invention provides a battery, a field winding fed from the battery and used for power generation, and a switching means connected in series with the field winding to supply or cut off a field current. A charging device for a vehicle, comprising a control device installed outside the generator to detect a voltage of the battery and generate a signal for energizing or deactivating the switching means in accordance with the voltage and control the generated voltage of the generator. In the apparatus, the power generation voltage control device determines the power generation voltage based on the detected temperature signal of the power generator, and is achieved by a vehicle charging / power generating device.

[0006] Preferably, the present invention is attained by a charging / generator for a vehicle, wherein the temperature signal of the generator is obtained from a temperature detector provided in the generator.

According to the present invention, there is provided a generator driven in accordance with the rotation of an engine to generate an output for charging a battery, a field winding fed from the battery for power generation, and connected in series with the field winding. A switching means connected to and supplying a field current, and a signal for controlling a fuel supply amount of the engine and detecting a voltage of the battery and energizing or deactivating the switching means according to the voltage. A charging device for a vehicle, comprising: a control device for controlling a voltage generated by the generator; and a temperature detector for detecting a temperature of the generator. And a temperature detector having a built-in temperature detector for correcting a fuel supply amount to the engine based on a temperature signal detected by the temperature detector. To achieve by the power generation apparatus.

Preferably, in the present invention, the temperature detector comprises:
The present invention is attained by a vehicle charging / generator that is installed near the switching means.

Preferably, in the present invention, the temperature detector comprises:
The present invention is attained by a charging and power generating apparatus for a vehicle, wherein a voltage output from the control device to the switching means is inserted into an input circuit of the switching means in series and used as a temperature signal of a generator.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
Will be described. FIG. 1 is a circuit diagram of an automotive generator and peripheral devices according to the present embodiment.

Reference numeral 1 in FIG. 1 denotes a generator driven by an engine (not shown), which includes a power board 10, three-phase armature windings 11a, 11b, 11c, and armature windings 1.
1, a rectifier 12 for converting AC output into DC, and a field winding 1 for supplying magnetic flux to armature windings 11a, 11b, 11c.
Consists of three. 2 is a battery, 3 is a key switch, 4 is an engine control device for controlling the engine, 41 is an ISC valve for controlling idle speed, 42 is an ignition coil, and 43 is a spark plug. Although one cylinder is described for the ignition coil and the ignition plug, an ignition system is actually provided for each cylinder such as four cylinders and six cylinders.

Inside the power board 10, there are a power transistor 101 connected in Darlington, and diodes 102a, 102b, 102c, 102d, 102 for detecting temperature.
e, a power diode 103, and a resistor 104.

FIG. 2 shows the inside of the engine control device 4. 401 and 402 are voltage dividing resistors, 403 is a constant voltage circuit that outputs a constant voltage of 5 V, and 404 is a constant voltage line (V
cc), 405 is a resistor, 406 is an AD converter that converts an analog signal to a digital value, and 407 is an M that performs arithmetic processing.
PU, 408 is an output buffer circuit, 409 is a transistor, and 410 and 411 are power transistors. The engine control device 4 controls the amount of fuel supplied to the engine,
Although the operation of controlling the ignition timing and the like and electronically controlling the engine is performed comprehensively, only the circuits around the power generation control are described in this embodiment.

Next, the power generation operation according to the above configuration will be described. FIG. 3 is a flowchart of a part related to the generator of the engine control device 4 in the present embodiment. A task related to power generation control is executed at a fixed cycle (for example, 10 msec.). When the task of voltage control is started in step 301, the process proceeds to step 302, where the battery voltage Vs is fetched. The voltage Vs of the battery 2 is divided by the voltage dividing resistors 401 and 402 of FIG.
At step 6, it is converted to a digital value. Let this voltage value be Vs,
Remember. Next, at step 303, the temperature VT of the generator is acquired. The constant voltage line Vcc of FIG. 2 is connected to the T terminal of the generator.
Supplies a current via the resistor 405. Generator 1
Are formed by connecting five diodes in series, and the voltage VT at the T terminal is represented by the following equation.

VT = 5 · VF (T) (V) (1) Here, VF represents a forward voltage of the diode, and has the following temperature characteristic as an example of the characteristic.

VF = 0.65−0.002 · (T−25) (V) (2) where T is the diode temperature (° C.). By substituting equation (2) into equation (1), VT = 3.25-0.01 · (T-25) (V) (3) is obtained. From the obtained VT, the temperature T is calculated in the following manner: T = 0.01 · (3.25-VT) +25 (° C.) (4)

Next, at step 304, the adjustment voltage set value is calculated. In general, the voltage for charging the on-board battery of a passenger car is optimally 14.4 V at room temperature (20 ° C.), and -0.01 V / ° C. depending on the temperature of the generator, and Vset = 14.4-0. .01 · (T-20) (V)... (5)

In the next step 305, the control duty to be output is calculated. As for the control duty, feedback control is performed so as to eliminate the deviation between the adjustment voltage set value Vset and the actual battery voltage take-in value Vs. In this embodiment, PI (proportional / integral) control is performed on the deviation, and D = K1 · (Vset−Vs) + K2 · ∫ (Vset−Vs) dt (6) where K1 and K2 are proportional, It is an integration constant.

In the actual digital operation, the previous D calculated by the voltage control task in FIG. 3 is set to Do, and the weighted average is calculated by the following formula: D = C1 · (Vset−Vs) + C2 · Do (7) , (7) become equivalent to (6).

The duty calculated by the equation (7) is transmitted to the transistor 409 in step 306. Then, the duty of the power transistor 101 is controlled via the C terminal.

The field current flowing through the field winding 13 changes due to the duty of the power transistor 101, thereby changing the voltage generated in the armature winding 11 and affecting the voltage of the battery 2 via the rectifier 12. Receive. The battery voltage Vs is feedback-controlled by the software described above, and is adjusted to the adjustment voltage Vset.
This adjustment voltage Vset is compensated by the temperature inside the generator 1, and is set to a high voltage at a low temperature and a low voltage at a high temperature, and the battery 2 is charged.

Next, the task of correcting the idle speed will be described with reference to FIG. When the idle correction task is executed at regular intervals in step 401, step 4
At 02, the engine speed Ne is taken. Ne is obtained from the cycle of the pulse signal generated by the crank angle sensor 44. In step 403, a calculation for correcting the air flow rate from the electric load is performed.

The torque Td for driving the generator is expressed as follows: Td = A · Po · η (Ng) (kgf−m) (8) Here, A: constant Po: output power of the generator (W) η (Ng): efficiency of the generator (depending on the rotation speed) Ng: rotation speed of the generator (r / m). The output power (W) of the generator is expressed as Po = Vs · Io (W) (9) Io: The output current of the generator (A).

The output current of the generator is equal to the field current IF.
On the other hand, it is uniquely defined by the magnetic circuit of the generator and is represented by a function that monotonically increases.

Io = F (IF, Ng) (A) (10) Here, the field current IF is expressed by the following equation with respect to the duty D input from the C terminal.

IF = D ・ (Vs−Vcesat.) / Rr (T) (11) where Vcesat .: collector-emitter voltage (V) of power transistor 101 Rr (T): field winding 13 Rr (T) = Rro + (T−20) · γ (Ω) (12) Rro: resistance value (Ω) of the field winding 13 at 20 ° C. γ: field Temperature coefficient of the resistance value of the magnetic winding 13 (Ω / ° C.) By substituting equation (12) into equation (8) from equation (9), Td = A · Vs · F (D · Vs−Vcesat.) / ( Rro + (T−20) · γ), Ng) · η (Ng) (8 ′) In equation (8 '), step 305 in FIG.
The duty D calculated in the above, the Vs taken in the same step 302, the temperature T taken in the same step 303, the engine speed Ne taken in the step 402 in FIG. ) Can be obtained from the rotation speed Ng of the generator, which is calculated by multiplication.

A, Vcesat., Rro, and γ are stored in advance as constants. Also, the function F (IF, Ng),
η (Ng) is discretized as data unique to the generator.

The required air amount Qo from the torque value consumed by the generator can be calculated from the characteristics of the engine. In general, if the amount of air proportional to the consumed torque is corrected and increased, a constant engine speed can be obtained.

In the present embodiment, precise correction can be performed by detecting the temperature of the generator and correcting the torque, and the idling rotation of the engine can be stabilized. As a result, the set value of the idle speed of the engine can be made lower than before, which contributes to improving fuel efficiency and reducing the total amount of harmful exhaust gas components. FIG. 5 shows a second embodiment of the present invention. Reference numeral 10 in FIG. 5 is the one obtained by replacing the power board 10 in FIG.

Inside the power substrate 10, a power transistor 101 connected in Darlington, a transistor 105 for detecting temperature, a power diode 103, and a resistor 1
04, 106a and 106b.

Here, the transistor 105 and the resistor 1
The circuit composed of 06a and 106b is the diode 1 in FIG.
Operation equivalent to 02a, 102b, 102c, 102d, and 102e is performed. Assuming that the current amplification factor of the transistor 105 is sufficiently large and the base current is zero, the voltage obtained by dividing the voltage VT at the T terminal by the resistors R106a and R106b becomes equal to the base-emitter voltage of the transistor 105. / (R106a + R106b) = VBE (13)
Becomes That is, when VT is calculated backward from equation (13), VT = (R106a + R106b) / R106a · VBE (14)
By appropriately selecting the values of the resistors R106a and R106b, it is possible to make the value larger than VBE. VBE is VF (forward voltage of diode) in equation (1).
And is temperature dependent. R106a = 1kΩ, R
If 106b = 5 kΩ, equation (14) becomes VT = 6 · VBE (14 ′), which is equivalent to the circuit of FIG. 1 in which six diodes are connected in series. In this embodiment, a circuit equivalent to that of the first embodiment can be formed with a small number of elements, and therefore, there is an economic effect.

FIGS. 6 and 7 show a third embodiment of the present invention. In the circuit configuration of FIG. 6, the C terminal and the T terminal are integrated into a T terminal as compared with the circuit diagram of FIG. FIG. 7 shows an internal circuit of the engine control device 4 of FIG. In FIG. 7, the C terminal is omitted, and the collector of the transistor 409 is connected to the T terminal. According to the present embodiment, the base current of the power transistor 101 is supplied from the IG terminal to the resistor 10.
4, diodes 102e, 102d, 102c, 102
b, 102a. With this base current, T
The voltage of equation (3) is generated at the terminal. However, when the transistor 409 is on, the T terminal voltage is suppressed to the collector-emitter saturation voltage of the transistor 409 (normally 0.1 V or less) and becomes a voltage independent of the temperature T. Therefore, when the voltage of the T terminal is taken in by the AD converter, the transistor 409 needs to be in an off state.
Therefore, in step 303 of FIG. 3, the data captured when the conduction signal is output to the transistor 409 may be ignored as invalid data. The temperature of the generator does not change abruptly and is 10 msec. Need not be captured for each voltage control task.

According to this embodiment, the number of terminals of the generator 1 and the number of terminals of the engine control device 4 can be reduced by one.
Economic efficiency is further improved.

FIG. 8 shows a fourth embodiment of the present invention. FIG.
Numeral 10 is the one in which the power board 10 of FIG. 6 is replaced.

Inside the power substrate 10, a Darlington-connected power transistor 101, a transistor 105 for detecting temperature, a power diode 103, and a resistor 1
04, 106a and 106b. This embodiment is a combination of the second embodiment and the third embodiment.
Since the number of diodes is reduced and the number of terminals is reduced, the combination has the greatest economical effect.

[0036]

According to the present invention, the temperature of the generator is accurately detected, the engine is controlled in accordance with the driving torque of the generator, and the engine speed, mainly the idle speed, is stabilized, and It is possible to improve fuel efficiency.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a vehicle generator and peripheral devices according to a first embodiment of the present invention.

FIG. 2 is an internal circuit diagram of the engine control device 4 of FIG.

FIG. 3 is a flowchart of a portion related to a generator of the engine control device 4 in the first embodiment.

FIG. 4 is a flowchart of a task for correcting an idle speed according to the first embodiment.

FIG. 5 is an internal circuit diagram of a power board 10 according to a second embodiment of the present invention.

FIG. 6 is a circuit diagram of an automotive generator and peripheral devices according to a third embodiment of the present invention.

7 is an internal circuit diagram of the engine control device 4 of FIG.

FIG. 8 is an internal circuit diagram of a power board 10 according to a fourth embodiment of the present invention.

[Explanation of symbols]

4 ... Engine control device, 10 ... Power board, 41 ... IS
C valve, 102a, 102b, 102c, 102d,
102e: diode, 406: AD converter.

Claims (5)

[Claims] 1. A battery, a field winding fed from the battery and used for power generation, switching means connected in series with the field winding to supply or cut off a field current, and installed outside the generator. And a control unit for detecting a voltage of the battery, generating a signal for energizing or deactivating the switching means in accordance with the voltage, and controlling a generated voltage of the generator. A device for charging and generating a vehicle, wherein the device determines a generated voltage based on a detected temperature signal of the generator. 2. The vehicle charging and power generating apparatus according to claim 1, wherein the temperature signal of the generator is obtained from a temperature detector provided in the generator. 3. A generator driven in accordance with rotation of the engine to generate an output for charging a battery, a field winding fed from the battery and used for power generation, and connected in series with the field winding. Switching means for energizing or interrupting the field current, controlling a fuel supply amount of the engine, detecting a voltage of the battery, and generating a signal for energizing or interrupting the switching means in accordance with the voltage, A charging device for a vehicle, comprising: a control device for controlling a voltage generated by a generator; and a temperature detector for detecting a temperature of the generator, wherein the control device includes: A vehicle charging and power generation device incorporating a temperature detector, wherein a fuel supply amount to the engine is corrected based on a temperature signal detected by the temperature detector. . 4. The method according to claim 2, wherein
The charging and power generation device for a vehicle, wherein the temperature detector is installed near the switching unit. 5. The generator according to claim 2, wherein the temperature detector is inserted in series with an input circuit of the switching means, and has a voltage output from the control device to the switching means. And a temperature signal for the vehicle.