JPS58535U - In-vehicle electronic control unit that suppresses noise - Google Patents

Abstract

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

Description

[Brief explanation of the drawing]

Figure 1 is a block diagram showing a configuration example of an on-vehicle microcomputer, Figure 2 is a wiring system diagram of a vehicle equipped with a microcomputer, and Figure 3a is a spectrum of clock harmonic components within the FM broadcast frequency band. is a partially enlarged view, Figure 4 is a block diagram of the simulation solution path used to measure two-signal interference noise, and Figure 5 shows the relative level of the auditory volume of the beat noise sound with respect to the frequency difference between the two input signals. The actual measurement diagram, Figure 6, shows the speed that is determined by the level difference between the two human input signals.
. Figure 7 is a measured diagram showing the relative level of peaker terminal voltage, Figure 7 is a measured diagram showing the absolute level of beat noise along with the S/N characteristics of the car radio, Figure 8 is a waveform diagram of beat noise, Figure 9 The figure is a conceptual diagram showing an embodiment of the present invention, Fig. 10a
, b, c are diagrams showing a configuration example of a lock pulse generation circuit with adjustable oscillation frequency, and Figure 11 is Figure 10C.
FIG. 3 is a characteristic diagram of the circuit shown in FIG. 30...Two-car armhole electronic control device, A, B, C.
...control device such as microcomputer, 32A
, 32B. 32o...Clog pulse generation circuit, 33...
... Ceramic resonator, 34.36 ... Fixed capacitor, 35.37 ... Semi-fixed capacitor. −−−i l ^ L−− −i −− 7−1−−−−−−−”

Claims (1)

[Scope of utility model registration request] In an in-vehicle electronic control device configured using a plurality of control devices that are synchronously controlled by clock pulses, a clock pulse generator built in each of the control devices is configured to control the AM broadcasting frequency of the clock pulses generated by these clock pulse generators. An on-vehicle electronic control device that suppresses noise, characterized in that the oscillation frequency can be adjusted so that fundamental wave components or harmonic components within the FM broadcasting frequency band have a predetermined frequency difference. .