JPS6259214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine throttle control device for an engine testing device in which a dynamometer and an engine are connected.

[Prior Art] A conventional device of this type is one shown in FIG. 1, for example. In this figure, the speed setting device 10
The setting signal which is the output of is transmitted to the throttle operating device 40 via the speed control amplifier 20 and the opening degree control amplifier 30 which controls the opening degree of the engine throttle. The throttle operating device 40 operates the throttle 51 of the test engine 50 with an operating rod 60,
In addition, the operating angle of the operating rod 60 is detected and fed back to the opening control amplifier 30, forming an opening control loop 31. Furthermore, the rotational speed of the test engine 50 or the rotational speed of the propeller shaft 80 after passing through the transmission 70 as shown by the dotted line is detected and fed back to the speed control amplifier 20, thereby forming a speed control loop 21. In this way, test engine 5
0 or the rotation speed of the propeller shaft 80 can be set by the speed setting device 10.

[Problems to be solved by the invention] When testing engine durability using such conventional equipment, a speed pattern is determined in advance, and the speed deviation from that pattern is within 1%.
The engine is controlled within the specified conditions. In such a case, the control conditions vary depending on the transmission position or the engine size, so it is necessary to adjust the amplification degree of each loop to match this pattern every time these conditions change.

The present invention has been made to eliminate such conventional drawbacks, and an object of the present invention is to provide an engine throttle control device that can always perform optimum loop adjustment even when control conditions vary.

[Means for Solving the Problems] An engine throttle control device according to the present invention includes an opening control loop having an engine throttle opening control amplifier and a throttle operating device, and transmitting an output to the opening control amplifier. The speed control loop includes a speed control amplifier for controlling the speed control amplifier, and a circuit for feeding back a rotational speed signal of the engine or a propeller shaft connected to the engine via a transmission to the speed control amplifier.

and a divider that outputs an output corresponding to the value of the ratio of the rotation speeds of the engine and the propeller shaft, and a first amplification degree regulator that adjusts the degree of amplification of the speed control amplifier according to the value of this ratio, an engine capacity setting device that generates a signal corresponding to the engine capacity; a reciprocal converter that receives this signal and outputs an output corresponding to its reciprocal; and a second device that adjusts the amplification degree of the opening control amplifier according to this output. An amplification adjuster is provided.

[Operation] The divider outputs the value of the ratio of the rotational speeds of the engine and the propeller shaft, that is, the gear ratio of the transmission. The first amplification degree regulator receives this output and outputs a control output such that when the value of the ratio is large, the amplification degree of the speed control amplifier is increased, and when the value of the ratio is small, the amplification degree of the speed control amplifier is decreased. issue. Therefore, the loop gain of the speed control loop will be an appropriate value depending on the gear ratio of the transmission.

The reciprocal converter converts a signal corresponding to the engine capacity into a reciprocal and outputs the signal. In other words, it outputs a signal that is inversely proportional to the engine capacity. The second amplification regulator receives this output and outputs a control output to reduce the amplification of the opening control amplifier when the engine capacity is large and to increase the amplification of the opening control amplifier when the engine capacity is small. . Therefore, the loop gain of the opening degree control loop becomes an appropriate value depending on the engine capacity.

[Example] The configuration of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of the present invention. In this figure, reference numeral 1 denotes a speed setting device for setting the speed of the test engine 5. The setting signal which is the output of this speed setting device 1 is transmitted to the speed control amplifier 2,
The signal is then transmitted to the throttle operating device 4 via the opening control amplifier 3. The throttle operating device 4 operates the throttle 52 of the test engine 5 using the operating rod 6, detects the operating angle of the operating rod 6, and returns the detected angle to the opening control amplifier 3, forming an opening control loop 31. Further, the rotation speed output obtained by detecting the rotation speed of the test engine 5 or its propeller shaft 8 by known means is fed back to the speed control amplifier 2 to form a speed control loop 21, as in the conventional case. be. Incidentally, in the case of such a test, the propeller shaft 8 is connected to a dynamometer 15. Here, the respective rotational speeds of the test engine 5 and propeller shaft 8 are detected, voltages proportional to these are generated, and these are used as two inputs of the divider 9. The divider 9 generates a voltage equal to the value obtained by dividing the former by the latter, and applies this to the gain adjuster 11 of the speed control amplifier 2 to adjust the amplification degree of the amplifier 2. That is, when the ratio of these rotational speeds is large, the amplification degree of the speed control amplifier 2 is increased, and when the ratio is small, the amplification degree is decreased. Also, engine capacity setting device 1
0, a voltage proportional to the capacity (displacement) of the test engine 5 is set in advance and outputted, and a voltage proportional to the reciprocal of the voltage is generated by the reciprocal converter 12, and the gain adjuster 13 of the opening control amplifier 3 is generated. In addition, the amplification degree of the amplifier 3 is adjusted. That is, when the engine capacity is large, the amplification degree of the amplifier 3 is decreased, and when the engine capacity is small, the amplification degree is increased.

In this way, the gear ratio of the transmission 7 can be automatically measured based on the engine rotational speed signal and the propeller shaft rotational speed signal, and the amplification degree of the speed control amplifier 2 can be adjusted, and the opening degree can be adjusted using the engine capacity setting signal. Since the degree of amplification of the control amplifier 3 can be adjusted, it is possible to adjust the control loop to be optimal under any engine condition.

In this embodiment, the engine capacity is set using the engine capacity setting device 10, but if the dynamic load of the engine changes due to a flywheel or the like attached to the engine shaft, this changing load can also be set externally. A similar effect can be obtained by configuring the rotation speed ratio to be multiplied by a voltage corresponding to the load amount.

[Effects of the Invention] As described above, according to the configuration of the present invention, the gain of each control amplifier is automatically switched, so even if the position of the transmission or the size of the engine changes, the gain of each control amplifier can be changed each time. This eliminates the need for adjustment, resulting in improved engine test accuracy and reduced adjustment time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional engine throttle control device, and FIG. 2 is a block diagram of an engine throttle control device showing an embodiment of the present invention. 1, 10... Speed setter, 2, 20... Speed control amplifier, 3, 30... Opening control amplifier, 4, 40... Throttle operating device, 9... Divider, 10... Engine capacity setting device, 11, 13... Gain regulator.

Claims (1)

[Claims] 1 Speed setting device for setting the speed of the test engine;
A speed control amplifier receives the speed set in the speed setting device and the speed of the test engine as input, and amplifies and outputs the difference between the two; a throttle operating device that operates the throttle of the test engine according to the input; An opening control amplifier that receives the operation amount of the throttle operating device and the output of the speed control amplifier as input, amplifies the difference between them, and outputs it to the throttle operating device, and the rotational speed of the test engine and the transmission. A divider that inputs the rotational speed of the propeller shaft connected to the above test engine and generates an output corresponding to the value of these ratios.The output of this divider is input, and when the value of the above ratio is large, the above speed a first amplification degree adjuster that increases the amplification degree of the control amplifier and adjusts it to decrease the amplification degree of the speed control amplifier when the ratio value is small; an engine capacity setting device that sets the engine capacity of the test engine; , a reciprocal converter that inputs the engine capacity set in this engine capacity setting device and outputs its reciprocal, and inputs the output of this reciprocal converter,
The present invention is characterized by comprising a second amplification degree regulator that increases the amplification degree of the opening degree control amplifier when the output is large and adjusts the amplification degree of the opening degree control amplifier to become small when the output is small. Engine throttle control device.